Elementary Wiki
Elementary Wiki

You are above average in intelligence. And for a policeman, I would say, top tier.

Thomas "Tommy" Gregson is the captain of the NYPD's Major Cases unit at the 11th Precinct and has been a police officer for over thirty years. He was the youngest detective in the history of the 14th Squad and took over Major Cases at age 40.[1] While observing the counter-terrorism bureau at Scotland Yard, he met Holmes and, years later, allowed him to work with the Major Cases unit as a consulting detective.[2] He was married to Cheryl Gregson and has several daughters.[3] One is Hannah, who is a police officer at the 15th Precinct and aspires to become a captain.[4] He is portrayed by actor Aidan Quinn.


Season 1[]

I've lost friends on the job to scumbags. Believe me, there's been more than a few times I thought about taking things into my own hands. But I didn't.

— Gregson, "M."
S01E01-Gregson pilot

Thomas Gregson Season One/Gallery

Gregson invites Holmes to review a crime scene where they work the case of the murder of a doctor's wife and, he meets Joan Watson. He introduces Holmes and Watson to Detective Bell at a crime scene and later unsuccessfully invites Holmes out for drinks. After Holmes disappears, Watson is forced to reveal Holmes is an addict to Gregson who later tells Holmes that he already knew about his condition. After the guilt of a serial murderer Gregson convicted is questioned, Holmes proves the convict is complicit in recent killings. Gregson is outraged when Holmes captures a serial killer, Sebastian Moran and intends to torture and kill him. He doesn't allow Holmes to work with the NYPD until Holmes is his only option in resolving a hostage situation. After the situation is resolved, Gregson meets Holmes in a bar, re-instates him and punches him in the stomach. After Holmes captures serial killer Howard Ennis alone, Gregson is pleased that Holmes doesn't repeat the mistakes he made with Moran. When Bell is a suspect in a series of murders, Gregson protects and supports Bell. When a snowstorm hits NYC, Gregson commands the relief response with FEMA and helps capture thieves who robbed a federal cash reserve. Further gaining Gregson's trust, Holmes shows him evidence of the murder of a blackmailer that he asks to be kept secret while he investigates. Gregson is drawn into Holmes and Watson's battle with Jamie Moriarty and her agents Isaac Proctor and Daniel Gottlieb.

Appearances in Season 1
"Pilot": At the first crime scene Holmes brings Watson to, Holmes half-jokingly introduces Watson as his personal valet to NYPD Captain Gregson and insists that Watson accompany him inside. Watson is up for the challenge and agrees. Gregson relates that Dr. Richard Mantlo, a psychiatrist at Sanbridge Hospital, returned home late from work the previous evening and called 911 after finding his wife, Amy Dampier, missing, and signs of a struggle in the apartment. Watson and Gregson watch Holmes inspect a room and she learns that Gregson knew Holmes from time he spent in London after 9/11. Gregson watches as Holmes finds Dampier's body in a hidden safe room. With Gregson's permission, Holmes obtains a list of tall men Mantlo knows. Having found a suspect, Holmes calls Captain Gregson and is surprised to hear that they are already at Saldua's and that he's been murdered. Joining Gregson, Holmes and Watson learn that Saldua has photos and a possession of Dampier's. Holmes meets Gregson at a bar, to examine the patient file on Saldua from his deceased psychiatrist. Later in Gregson's office, he watches as Holmes produces Saldua's phone with recordings that show that Mantlo is guilty of arranging his wife's murder.
"While You Were Sleeping": Gregson calls Holmes, requesting he attend a murder scene. On the top floor of an apartment building, Gregson shows Holmes the victim, Casey McManus, dead from a single gunshot to the forehead and his apartment robbed. Holmes believes the murder and robbery were done by two different people and finds the robber, a neighbor. In the box at the 11th Precinct, the neighbor admits to the thefts, but not the murder. Detective Bell is disbelieving, but Holmes forcefully provides evidence the neighbor is being truthful, annoying Gregson. Watson tactfully asks Holmes to get her a bag of chips and once out of the room, Watson asks Gregson about his past acquaintance with Holmes in London. Gregson praises Holmes' abilities but not his behaviour and Watson discovers Holmes lied to Gregson about where he was when he called to ask to work with him in NYC. Holmes believes Gregson wouldn't let a recovering addict work on sensitive cases and threatens to sue Watson if she tells Gregson. Gregson beacons them to a murder scene with the same M.O. as the first. Gregson arranges a meeting with a former police officer who was surveilling the latest victim. Gregson leads a team who questions Rebecca Ellison about the murder victims, who are her half-siblings. After Holmes sets a trap for Rebecca's sister Yvette, Gregson leads the police team that catches Yvette about to commit a murder and she is arrested for the two murders. As Holmes and Watson are heading out, Gregson and Bell meet them, and Gregson invites them out for drinks. Holmes is surprised by the offer, but declines politely.
"Child Predator": Holmes and Watson meet Gregson at the home of the Castillos whose daughter Mariana has been abducted. Gregson objects when Holmes stops a TV news crew from broadcasting an interview with the Castillos. Gregson is part of the chase of a van believing to be driven by the abductor. When it's discovered the van is being driven by the abductor's first victim, Adam Kemper, Gregson allows Holmes to question Kemper at the precinct. Gregson ends the questioning when Adam's parents show up and later informs Holmes that an immunity deal is being working out for Adam in exchange for testimony on his abductor. After abductor is discovered to be Samuel Abbott, Gregson leads an ESU team that raid an address where a video of Abbott demanding Adam's return in exchange for Mariana is found. When Gregson won't make the exchange, the Castillos threaten him. Gregson asks Holmes to speak to Adam again to see if he can get him to sign the immunity deal in order to get information to find Abbott.
"The Rat Race": After Holmes finds the body of a missing investment banker, Peter Talbott, with Gregson and Detective Bell on the scene, Holmes insists it's a murder as evidenced by the state of Talbott's apartment, his job and the lack of needle marks. He deduces that a salad Talbott ate was dosed with heroin and then he was given the fatal shot. Gregson is doubtful but has the salad tested. Later, Holmes is kidnapped by Donna Kaplan, Talbott's killer. When Watson cannot get a hold of Holmes, she asks Gregson for help. After reassurances from Gregson and attempts to explain why not hearing from Holmes is unusual, she admits that she is his sober companion, he's never supposed to be out of contact and she believes he may have relapsed. After Holmes is rescued with Watson and Gregson's help, a humbled Holmes speaks with Gregson in his office. He explains that he withheld the truth about his addiction due to embarrassment as Gregson has always thought highly of him. Holmes apologizes and is then surprised to find out Gregson already knew. He wasn't happy Holmes didn't tell him and affirms the quality of Holmes' work and since others may not understand, Holmes' addiction will stay between them.
"Lesser Evils": After Holmes locks himself and Watson in a hospital room, believing that a man who died there was murdered, Gregson resolves the incident with the hospital administrator. After Holmes discovers a doctor, Cahill, at the hospital was stealing morphine, he and Gregson question Cahill in "the box" at the precinct. Holmes finds a killer of terminally ill patients, Danilo Gura, a janitor at the hospital. He and Gregson question Gura in the box who admits to all the killings but one.
"Flight Risk": When Holmes hears reports of a plane crash on his police scanner, he arrives at the scene to Gregson's surprise. Gregson asks Holmes to go home until Holmes discovers that the plane crash was caused by the discovery of a dead body on board the plane. After the owner of the plane's charter company, Charles Cooper, accuses one of his pilots, Owen Barts, of the murder, Gregson leads a team to Barts' house where they discover evidence of the murders which appears to have been planted. Gregson, Holmes and Bell interrogate Cooper in the box and confronting him with evidence that he's the murderer, Gregson gives him the choice of confessing and accepting life imprisonment or risking the death penalty.
"One Way to Get Off": Holmes meets Captain Gregson at the murder scene of a husband and wife, the Myroses. Immediately, Holmes see the crime has the same M.O. as home invasion murders perpetrated by Wade Crewes in 1999 whom Gregson brought to justice. Gregson believes the latest murders were done by a copycat but after Holmes finds that a woman's shoe is also missing, he believes that Crewes lied in 1999 when he said he worked alone and his accomplice is killing again. At the precinct, Gregson briefs a newly-formed task force to deal with the murder of the Myroses. Holmes proposes that he and Gregson interview Wade Crewes at Sing Sing, but Gregson doesn't see the value. Gregson, Bell and Holmes question a contractor who worked at the Myroses and free a sex slave he had imprisoned. At the precinct, Gregson meets his partner from 1999, Terry D'Amico who Holmes has called to provide insights. Bell briefs the task force on the findings to date including that Crewes maybe working with an accomplice. When Holmes suggests Crewes may be innocent, D'Amico refutes this and Gregson angrily dismisses everyone. He decides to question Crewes and allows Holmes to come along. At Sing Sing, Crewes isn't surprised to see Gregson. He denies any connection to the latest murders, practices anger management when Gregson asks who his accomplice is and quotes Tolstoy. He also claims he's innocent of the 1999 murders, that Gregson planted evidence to further his career and his attorney wouldn't pursue his alibi, that he was with Carla Figueroa, a woman he was having an affair with. He convinced he'll be exonerated. Holmes and Gregson drive to Carla Figuero's home to question her but meet her son, Sean, who says she died years before. Holmes asks Gregson why he's so resistant to the possibility Crewes is innocent. Gregson tells Holmes to watch the interrogation tapes in which Crewes gloats. Holmes watches the tapes at the Brownstone, and notices that a coffee mug, found smashed at one of the 1999 crime scenes with Crewes' prints on it, was originally handed to Crewes during his interrogation by Gregson. On a street, Gregson secretly meets with Terry D'Amico and says that he realized she planted the mug. She says she always thought Gregson knew but he thought it was good fortune as they were both convinced Crewes was guilty. The recent killings have put doubt of Crewes' guilt in Gregson's mind but D'Amico points out that if Gregson tells, she could go to prison and his career will be over which Gregson indicates won't dissuade him from owning up. Gregson is at another murder scene that matches the Crewes M.O. and Gregson says he won't hide the Crewes frame-up but incredibly, Holmes shushes him. After Holmes finds Crewes' accomplice, at Sing Sing, a confident Crewes meets Holmes and Gregson. Gregson shows him the women's shoes and the murder weapon, provided by Sean, who confessed to the recent murders and being Crewes' accomplice. To Gregson's satisfaction, he tells Crewes he's getting additional charges. Crewes explodes and is dragged out by the guards.
"The Long Fuse": Holmes and Watson meet Gregson and Bell at the scene of an explosion at a web design firm where Holmes quickly finds the remains of a pager, an antiquated device which he believes was the bomb's trigger. Holmes interrupts Gregson with the bomb squad and looking at the evidence, he points out the bomb's battery is four years old as is the newspaper used to pack the bomb evidenced by an old photo of Obama and a date Watson finds. Holmes shows Gregson that he's found the impression of the word "Novocaine" on one of the scraps of newspaper used in the bomb. Even though it's not a suspect, Knowles', handwriting, Gregson believes he's the bomber. Since the threat against Vanowen SC wasn't made public, Holmes believes an employee may be the bomber. Gregson refuses to get him a subpoena so Holmes will need to get the employee records on his own. After Holmes finds the body of a missing Vanowen SC employee, Pradeep Singh, his wife Himali is interviewed where Gregson confirms that she was in India when Pradeep disappeared. Holmes believes that Pradeep was the target of the bomb as he discovered his office was near the air vent. After evidence is found linking Heather Vanowen to Pradeep's murder and the bomb, she's confronted with the evidence in Gregson's office and arrested.
"You Do It to Yourself": After a college professor, Trent Annuzio, is murdered by being shot in the eyes, Holmes shows Gregson and Bell microscopic photos of cancer cells found in the remnants of Trent Annunzio's eye sockets. The cancer was terminal and very painful. Holmes believes Annunzio planned his own death. Gregson admits Holmes' theory makes sense but it isn't enough to release Annunzio's T.A., Brendan O'Brien, who confessed to the murder and that Annunzio's wife Jun is being deported. After Holmes finds that Annuzio paid a man to murder him to get revenge on O'Brien, he's shown into Gregson's office and Gregson informs O'Brien and Jun that if they get married immediately, the deportation processing will stop. They agree and hug enthusiastically while Holmes praises O'Brien.
"The Leviathan": After Holmes recovers various valuable stolen artworks, he and Watson return all, except Van Gogh's "Pieta". At the scene of a murdered safe cracker, Holmes finds a stolen diamond in a glass vase filled with multicolored decorative rocks. Gregson orders a full scale canvassing of the area. Gregson and Holmes compel Jermey Lopez to provide a blood sample which matches DNA at the scene of the murdered safe cracker.
"Dirty Laundry": Gregson attends the crime scene of hotel manager Teri Purcell who was found in a washing machine, dead of a blow to the head. In a New York suburb, Gregson and Holmes question Teri's husband, Oliver, and her teenage daughter, Carly, who both don't know who would want to hurt her. After Watson and Holmes find that Teri was facilitating prostitutes at her hotel, Gregson confirms this from Vice and that Teri and arranged meeting with diplomats and rich clients. After Holmes discovers a private network comprised of feeds from a series of hidden cameras installed in the hotel's rooms linked to Teri's office, Holmes theorizes to Gregson that Teri was blackmailing guests. Gregson laments that it'll take a huge amount of resources to review all the tapes to find a suspect but Holmes doesn't agree. After Holmes deduces that Teri and Oliver are Russian spies, Gregson, Bell and Holmes arrest him. Gregson listens to Oliver's confession in "the box" with an FBI agent where Oliver reveals his handler is Geoffrey Silver. In Gregson's office, Oliver and Teri's daughter, Carly, believes she killed her mother accidentally after Teri revealed to Carly she and Oliver were Russian spies and insisted that Carly become one too. She mentions Silver came upon them and told her to leave Teri for him to take care of. Gregson witnesses as Holmes provides proof how Teri wasn't dead after Carly left and how Silver finished her off.
"M.": Gregson calls Holmes to a murder scene with a large pool of blood but the body is missing. Holmes describes how the man was killed and that he knows this as he unsuccessfully investigated a series of murders with the same MO in London. After Holmes briefs Gregson's team on the serial killer "M", Gregson asks Holmes if he thinks it a coincidence that M has shown up in NYC since Holmes started living there. Holmes isn't concerned but Gregson assigns police to protect him and Watson. After Holmes finds a letter from M in the Brownstone, Gregson examines it and offers re-location which Holmes and Watson refuse. When Watson learns that Holmes can find M, who he intends to kill as he believes M killed his love Irene, Watson informs an irate Gregson. Holmes captures M while he's trying to kidnap Melanie Cullen and later in the hospital, Gregson and Watson question her. When she mentions she saw chalk dust on Holmes' shoes, Watson tells Gregson where Holmes has brought M. Gregson finds the location empty but is called by Bell who says Holmes brought Sebastian Moran (M) into the precinct. Moran stubbornly lies that Holmes did not abduct him. He lured Holmes to Cullen's who then followed him to the loft, where Moran attacked him. Holmes stabbed Moran in self-defense though by some miracle, he missed every major organ.
"The Red Team": In the wake of Holmes' kidnapping of Moran, Gregson refuses to let Holmes work with the NYPD. Watson tries unsuccessfully to change Gregson's mind but Gregson doesn't believe Holmes is repentant. When Holmes discovers a former team of experts, the Red Team, who helped the Army are being killed, a suspect is brought to the precinct and when Holmes arrives, he's ejected by Gregson. After Holmes' own investigation turns up solid evidence of murders, Gregson calls him to the precinct to help interview the remaining team members. After officers visit one of the team members to take into protective custody and are shot by a booby trap gun, Gregson and Bell attend the scene and believe the member, Walter McClenahan, is the prime suspect. When the rest of the members are taken into protective custody in a motel, one of the members, Harold Dresden, takes an officer hostage and threatens to kill him unless the other team members are brought to him. Holmes asks Gregson if he can see Dresden and claims he can end the hostage situation. Holmes does and Gregson asks him to meet him later at a bar. At the bar, Holmes apologizes for lying to Gregson but haughtily says the NYPD needs him. Gregson rebukes Holmes' self-centered behaviour but admits he is special and needs him. He'll never trust Holmes again, gives him a gut shot and as Holmes gasps for air, welcomes him back.
"The Deductionist": After a serial killer, Howard Ennis, is transported to a hospital to donate one of his kidney's to his sister Patricia, he manages to kill the medical staff and escape. At the crime scene, Gregson indicates that Ennis wrote "SHEDIR" in blood before leaving. Gregson and Holmes question Patricia in her hospital room. Dying of kidney failure, she says she's had no contact with Howard since he was sent to prison, and doesn't know where he might be. Holmes confronts Kathryn Drummond, an FBI agent on the case, while she's talking to Gregson on the Shedir clue and is surprised to find that Drummond agrees it's a misdirect. After Howard kills a number of people at a bodega, Gregson challenges an embarrassed Drummond whose predictions of Howard's actions have been completely wrong. The next morning in Gregson's office, Ennis calls. He blames Drummond for his father's suicide and tells Gregson he'll stop killing if he's given Drummond.
"A Giant Gun, Filled with Drugs": Holmes and Watson help Holmes' former drug dealer Rhys Kinlan find the kidnapper of his daughter Emily. Discovered to be DEA Agent Diaz, Diaz attacks Kinlan and Watson but is subdued. At the precinct, Diaz is interrogated about Emily but he claims to know nothing about her. He claims he followed Rhys to the Brownstone to question him and assumed Watson was working with him. Captain Gregson says Watson and Rhys have a different story, but Diaz thinks that a judge will believe him over a drug dealer. Gregson says the DA is offering protective custody while he is in prison if he confesses and gives Emily's location. Diaz appears unconcerned and Gregson guesses that he is betting that Emily will die before being found. However, Holmes' pre-war buildings near an Ethiopian restaurant deduction search has been narrowed to those near Diaz's apartment which police teams are searching. Bell and Gregson get up to leave but Diaz stops them.
"Details": After Bell is shot at in his car, in the 11th Precinct garage, Gregson, Holmes and Watson examine the wreckage of the car, while a bruised Marcus looks on. Gregson and Holmes both recognize an MP5 was the weapon used and the shooter had poor aim. Marcus knows who the culprit is. In Gregson's office, Marcus shows them the file on Curtis Bradshaw, a former drug kingpin. Arrested by Bell and while in jail, Marcus arrested most of his lieutenants and when Bradshaw was released, his organization was gone. Marcus recognized Bradshaw's prize car as the one used to shoot at him. Gregson, Holmes and Watson confront Curtis Bradshaw at a pickup basketball game. Bradshaw denies being the shooter, claims his car was stolen and two cronies give alibis. When Bradshaw is found murdered, Gregson says the media believes a cop killed Bradshaw as retaliation for the attack on Marcus. After Holmes finds evidence Bell is being framed for Bradshaw's killing, Gregson takes Bell off field duty to protect him. Holmes finds the pistol used to kill Bradshaw in Bell's apartment and lies to Gregson that he found it in a dumpster. After Holmes finds the murderer who is framing Bell is Officer Paula Reyes, she called into the conference room. Gregson explains that they have been looking for a killer who is a cop, a former member of the Bradshaw detail, and had a key to Marcus' apartment. Only she fits and Gregson also notes that I.A. suspected her of helping steal the heroin planted on Bradshaw and that she's dating an I.A. member. Gregson then tells her that the guns used at the various scenes all match those owned by a gun dealer Reyes arrested. The guns went missing but her home is being searched for them which results in her admitting to the crimes.
"Possibility Two": After millionaire Gerald Lydon unsuccessfully tries to hire Holmes to prove that he was poisoned with a genetic disease, Gregson calls that Lydon has been arrested for shooting his butler Crabtree and is refusing to talk to anyone but Holmes. At the crime scene, Gregson tells Holmes that Lydon can't remember shooting and Holmes takes Lydon's case. Gregson attends the murder scene of geneticist Natasha Kademan who was killed after telling Holmes that it was possible to poison Lydon with a genetic disease. A suspect in Kademan's murder, Benny Cordero, is questioned by Bell and Gregson but Holmes constantly interrupts their questioning, insisting Cordero isn't the killer. After Cordero's DNA matches the blood at Kademan's murder scene, he provides an alibi to Bell and Gregson. Gregson is part of the interrogation of Kademan's geneticist fiance who admits to killing her and planting Cordero's DNA, which he made, at the scene. After Holmes deduces that the head of the genetic company Kademan worked for, Brian Watt, has the genetic disease and was poisoning rich people with it so they would contribute to finding a cure, he brought to the precinct. Gregson indicates detectives are on the way to his home to search for the poison.
"Déjà Vu All Over Again": Holmes investigates a case involving a subway pusher and at the precinct, Holmes shows Gregson footage from the subway camera taken days before Vivian Tully was killed. Holmes noticed a man was following her who can be identified, Anson Samuels. He's questioned in "the box" and claims ignorance but once Holmes confronts him with the video and that he worked in Tully's building, he admits his obsession with her. However, he has proof he's not the killer and shows them a video he took of the incident. In "the box", Drew repeats to Gregson and Bell that he did not kill his wife Callie. Holmes relates that Watson deduced that he was Tully's pusher. She remembered that Callie had left him once before, 18 months ago, and Bell shows a news article about Anna Peters, who was accidentally pushed under a subway train 18 months before, by a scuffle among some teenagers. The news stories mentioned that Peters was carrying flowers. Six months ago, Drew realized that if he recreated the Anna Peters event mentioned in Callie's video, he could kill her and the video would give a rationale for her disappearance. Drew accuses Watson of creating circumstances to arrest him, to make up for the mistake that led to her arrest. Gregson has Drew confirm that Callie's video was from six months ago. Gregson then shows him a deleted email sent to him from Callie's account, with the video from 18 months previous, which Drew re-sent himself six months ago using Callie's account.
"Snow Angels": During a snowstorm warning an office building security guard is killed by three thieves. Gregson calls Holmes and Watson to the scene. At the precinct, Gregson introduces his command to Denise Castor, from the Federal Emergency Management Agency (FEMA), sent to co-ordinate the snow storm response. Holmes deduces that the thieves intend to rob a large government cash depository, EROC, and leaves a message for Gregson. In "the box" at the precinct, Bell pressures one of the thieves he's caught, Darvin, to name her partners in the phone heist until Gregson interrupts, having received Holmes' message, and asks her about EROC. At the precinct, Bell and Gregson tell Darvin they have her file from Interpol. Her real name is Elle Bastien and she's wanted for crimes in other countries along with her husband. They invite her to give up his location but she refuses. After EROC is robbed and an ambulance used to transport the money through roadblocks set up during the storm, Holmes shows Bell and Gregson on a Manhattan map that someone was clearing an escape route for the ambulance. Holmes suggests that FEMA official Denise Castor may be part of the heist and Bastien is refusing to talk as she has confidence that Castor will help her escape. Gregson facilitates a ruse of a prisoner riot which allows Castor to break Bastien out of the box and they are apprehended trying to leave the precinct.
"Dead Man's Switch": After witnessing the murder of a blackmailer, Charles Milverton, who has a fail-safe partner who will release all blackmail material if Milverton dies, Holmes explains his dilemmaand Gregson agrees to keep the killing secret so the fail-safe can be found. Later, Gregson reports an arrest of a man trying to dump Milverton's corpse at a construction site to Holmes. The man, Anthony Pistone, admitted to the killing because his daughter was filmed and raped and he was being blackmailed. Despite Mivlerton's death, the fail-safe doesn't act and Holmes discovers him, Stuart Bloom, dead. When more blackmail demands occur, Holmes deduces who has taken over Milverton's blackmailing business. In Gregson's office, Holmes greets Pistone who has made bail. He and Watson tell him they discovered that Milverton was beaten four months ago. He told the hospital staff it was by a mugger but they believe Pistone beat him and show him photos of Milverton's head scars which match a cross-shaped ring Pistone wears. Gregson shows Pistone Milverton's laptop, which was found at Pistone's home and his brother has confessed to being Pistone's accomplice who sent the latest blackmails.
"A Landmark Story": Holmes takes a call from Gregson that Sebastian Moran wants to confess to more killings but will only speak to Holmes. Later, Holmes lies to Gregson that Moran provided no useful information. He explains to Watson that he wants to find out if a man, Hoff, was murdered before sharing with Gregson and promises that he isn't planning revenge on Moran. After an accomplice of Moriarty, John Douglas, is killed in front of Holmes by a sniper, Gregson arrives at the crime scene, wants to know what's happening to Holmes and what Moran said to him. Holmes promises that he's not seeking revenge and will give him a man who has been killing for Moriarty, Daniel Gottlieb. Gottlieb freely confesses his many murders at the precinct with Gregson and Bell and later, Gregson calls Holmes to tell him that Moran has committed suicide in prison.
"Risk Management": Watson is called to Gregson's office where he asks if she'd like to be a sober companion for a friend's daughter in Florida. Watson says she'll give him some other companions and leaves. Watson feels Gregson is trying to get her to become a sober companion again because he's unhappy with her work. Gregson explains that he's trying to protect Watson from the danger of Holmes' situation. Katie Sutter witnesses the murder of her husband's sister. Decades later, the killer hasn't been found so she implicates an innocent man, Wallace, in order to save her husband from suicide who, her husband kills. At her office, Katie is confronted by Holmes, Watson, Gregson and Bell. Gregson says they've confirmed Wallace was out of the country during Leah's murder, Katie confesses to falsely implicating Wallace.
"The Woman": Having found Irene Adler, at a hospital, her doctor tells Holmes, Watson and Gregson that her personality has been destroyed by a masked man who she called Mr. Stapleton. At the mansion where Adler was found, she meets with Gregson and Bell. Watson examines pigments Adler was using in her paintings and discovers a rare sample that only a few shops in NYC sell. Finding the buyer may result in discovering who was holding Adler. Gregson tells Watson her pigment tip led to a buyer named Duane Proctor who was imprisoned for a weapons assault. Gregson and police question Duane's brother, Isaac, at his home where Duane also lives. Isaac doesn't believe Duane has anything to do with holding Adler. Duane arrives so Gregson leaves an officer with Issac. As Gregson questions a confused Duane, shots are heard from inside the house and Isaac is found to have fled. Gregson tells Watson that Isaac was a professional killer but chose to only wound the officer guarding him. At the precinct, from a hidden camera, Watson shows Bell and Gregson video of Isaac leaving the flower for Adler.
"Heroine": After Irene reveals herself to be Moriarty and kills Isaac Proctor, Proctor's body is brought to the Morgue where Gregson is brought up to speed. Gregson expresses his concern about Holmes to Watson who promises to ensure he doesn't do anything extreme. At the precinct, Holmes and Watson argue in front of Gregson about her forced lunch meeting with Moriarty with Holmes believing she could have avoided it. Gregson assigns security details to them. After Holmes deduces Moriarty's plan involves blackmailing a Greek national, Theopilius, to kill two Macedonians, the Baceras, Gregson calls to warn them but is too late to prevent their shootings. Later at the precinct, the Macedonians bodyguard, Conroy, lies that he was hit from behind after Gregson's phone call and managed to free himself after the Baceras were killed and then shot Theopilius. Gregson has to separate Holmes from Conroy. After Watson and Holmes concoct a ruse to trap Moriarty, she is arrested by Gregson.

Season 2[]

We've got a mission here. It's to protect this city and the citizens that live in it. You are all part of that effort every day. Most of you do yourselves and this department proud. And for that, I want to thank you.

— Gregson, "On the Line"
S02E05-Gregson beach

Thomas Gregson Season Two/Gallery

Gregson arrives on the scene after Holmes and Watson apprehend the murderer of three US Attorneys, just before they leave for London. He's involved in the arrest of government secret leaker Ezra Kleinfelter and finding the killer of a former Polish mobster. After a break-in in his house, where his wife Cheryl shoots an armed intruder who demands Tommy's whereabouts, he reveals that he and Cheryl are on a trial separation. He vows to make his work less of a priority and spend more time with Cheryl. Gregson deals with an insubordinate detective who doesn't want Holmes and Watson working at the precinct. Gregson calls together his command, addresses complaints about Holmes and Watson and challenges anyone who doesn't agree with how he utilizes all the resources under his command to quit. After the judge in an administrative hearing recommends that the NYPD end their relationship with Holmes and Watson, Gregson is able to convince the Commissioner to not accept the recommendation. Gregson allows Detective Bell to transfer to the Demographics unit but is relieved when Bell decides to return to the 11th Precinct. Gregson is drawn into events involving a mole hunt within MI6, Sherlock's brother Mycroft and the French criminal organization "Le Milieu."

Appearances in Season 2
"Step Nine": Gregson arrives on the scene after Holmes and Watson apprehend the murderer of three US Attorneys, just before they leave for London.
"Solve for X": A suspect in the death of two mathematicians, Tanya Barrett, is questioned in "the box" by Gregson and Detective Bell. Gregson confirms she owns a Boston terrier, hair of which was found on one of the bodies and, Holmes points out she owns a pistol the same as the murder weapon. She says the pistol was stolen and denies killing Soto and Nauer to use their work. She provides an alibi during the murders, she was having dinner at a restaurant with a man, Wayne Kaneshiro. The restaurant sends security video with a timestamp that confirms Barrett's alibi. A man who was shot just after Soto, Benny Charles, regains consciousness in the hospital which Gregson reports to Holmes and Watson.
"We Are Everyone": In pursuit of Ezra Kleinfelter, a leaker of government secrets, Gregson attends the murder scene of Vanessa Hiskie, who was found to be hiding Kleinfelter. After Holmes deduces that Kleinfelter is hiding in a decommissioned bunker, Gregson sends text to Holmes that the bunker is empty, save an Everyone card. After discovering Ezra is fleeing the country on a jet belonging to a billionaire, Holmes stakes out the jet with Bell, Gregson and Watson where they see a limo approaching and identify Kleinfelter as the driver. When Kleinfelter is arrested, he demonstrates that the identities of US agents will be revealed if he's not allowed on the plane. Gregson confirms that the leak of the info will cause the agents' death and Kleinfelter is set free.
"Poison Pen": At the murder scene of Titus Delancy, Gregson has the Bell question a dominatrix, Mistress Felicia, who found Delancy. He watches as Holmes shows that a glass of bourbon Delancy drank was poisoned with nitroglycerin. Gregson and Bell question an executive at Delancy's company, Burt Jeffries, who has an alibi. Having been absent at their country home with her two step-sons, Titus' wife Peri is questioned at the Delancy home with Gregson present. She claims that she and the boys were in the country home when Titus died but it was her nanny, Anne Barker's, night off. When Holmes reveals that Barker is actually Abigail Spencer and was acquitted in the poisoning death of her father, Gregson and Holmes question her in "the box" where she denies killing Titus. After Holmes finds that Peri was planning to kill Titus but didn't, she's questioned with her lawyer by Gregson and others. After Bell and Watson find Titus' tablet with videos that show that Titus was sexually abusing his son Graham, Graham is brought to the precinct accompanied by his aunt and their lawyer. Confronted with the tablet and its contents by Gregson and others, Graham orders his aunt and lawyer out of the room.
"Ancient History": After Holmes and Watson discover a corpse in the Morgue of Leo Banin, who they believe killed someone before he died, they inform Gregson that Leo was a killer in Poland for the Russian mob before moving to NYC and becoming a retirement home nurse. His corpse displays wounds from garroting someone the day he died. However, without a victim, Gregson says they have no case. Holmes calls Bell and tells Watson they need to examine the site of Leo's motorcycle accident as he believes the Russian mob killed him. At the accident scene with Gregson, Holmes finds Russian cigarette butts and shells from a pistol leading him to believe Leo was shot at and this caused his fatal accident. At the precinct, Gregson informs Holmes that Leo stole money from the Russian mob before emigrating to the US and the shells match a pistol used to murder a witness against the mob. At the precinct, Gregson and others show Leo's wife Lara, evidence that she made an attempt to kill Leo with an accomplice before shooting him while on his motorcycle.
"An Unnatural Arrangement": After a break-in in his house, where his wife Cheryl shoots an armed intruder who demands Tommy's whereabouts, he reveals that he and Cheryl are on a trial separation. Cheryl is tired of Tommy's job being prioritized over her, but Tommy thinks the trial separation is just a break for Cheryl and that she'll come back. During the investigation, Tommy learns that Cheryl has dated a man that Tommy hates. After realizing why his wife wanted the separation, he lets her know that she deserves better and that he is going to use the separation to figure out how to give it to her.
"The Marchioness": Gregson is involved in the interrogation of a drug cartel hitman, "El Mecanico" but is surprised to find that fingerprints at the scene of one of his suspected murders don't match those that El Mecanico provides.
"Blood Is Thicker": After Haley Tyler, the estranged daughter of a dying tech billionaire, Ian Gale, is murdered, Gregson is involved in the interrogation of Haley's boyfriend, Ray McKibben, who has an alibi. He's part of the team that presents compelling evidence to Haley's suspected murderer, Natalie Gale, and gives her the chance to confess.
"On the Line": Meeting Holmes and Watson at the scene of a murder on a bridge, Holmes shows it was a staged suicide by Samantha Wabash in order to frame Lucas Bundsch. Samantha believed her sister, Allie, was abused and killed by Bundsch. Gregson brings the detective who handled Allie's case, Gerry Coventry, to review his findings but he is uncooperative and combative with Holmes and Watson. Gregson has to break up an altercation between Holmes and Coventry. At a bar, Gregson confronts Coventry about his insubordinate behaviour. Coventry thinks Gregson a fool for giving Holmes his support and threatens to go to the police union if Holmes isn't taken off his case. After Holmes confronts Bundsch and punches him, Gregson informs Holmes that Bundsch has placed a restraining order on him. After Holmes discovers from blueprints that Bundsch has a secret room at his recording studio, Gregson gives Bundsch a search warrant which also allows Holmes access. Abducted women are found in the room and watches as a husband is reunited with his wife. Later at the precinct, Gregson calls together his command. Largely to put Coventry in his place, he addresses complaints about Holmes and Watson and challenges anyone who doesn't agree with how he utilizes all the resources under his command to quit.
"Tremors": Gregson is in the audience during an administrative hearing to determine whether the NYPD should continue their relationship with Holmes and Watson. Holmes recounts the story of Gregson addressing his command until an officer brings in an armed, confused man, Silas Cole, who Holmes is able to disarm. Gregson tries to question Cole but is unsuccessful due to him being a schizophrenic. Watson interrupts the proceedings to fetch Gregson and at a hospital, they learn that Detective Bell's surgery for an abdominal gunshot has resulted in complications that may affect the use of his right arm. During a break in the proceedings, Gregson advises Holmes to stop taunting the prosecutor with his answers. Gregson is involved in the arrest of a doctor who killed Cole's ex-girlfriend. After the judge recommends that the NYPD end their relationship with Holmes and Watson, Gregson is able to convince the Commissioner to not accept the recommendation.
"Internal Audit": Gregson attends the scene of the murder of Donald Hauser, a crooked hedge fund manager. Later, he's at the scene of the murder of reporter Rosalie Nunez who was killed in the same manner as Hauser. At an art gallery, Holmes and Watson show him the body of the man, Maddox, who killed Hauser and Nunez. With Holmes and Watson, he arrests Jacob Weiss, who was behind all three murders. Hauser helped Weiss embezzle money from his charity but when Hauser's illegal hedge fund practices were discovered, he informed reporter Nunez of the charity embezzlement for which Weiss hired Maddox to kill Hauser and Nunez. Weiss then killed Maddox.
"The Diabolical Kind": After Kayden Fuller, the daughter of millionaires is kidnapped, Gregson and a police squad attend the Fuller residence as Kayden's mother Allison accepts a phone call with the ransom demand. Linking the kidnapper to Jamie Moriarty, Gregson arranges for Holmes and Watson to question her at an FBI prison "black site." Moriarty offers her help in finding the kidnappers which involves her arriving at the 11th Precinct. After Moriarty provides sketches of the kidnappers, Gregson issues them within the NYPD. After two officers are killed by the kidnappers, the head kidnapper, Devon Gaspar, calls Gregson's office to inform him that they've been watching the precinct and know Moriarty is helping them. Moriarty escapes from her FBI handlers and at her prison cell, Gregson explains to Holmes and Watson how she wounded herself in order to escape. After Holmes apprehends Moriarty and turns her over to paramedics, Gregson tells Watson that Moriarty will survive.
"All in the Family": With Bell having transferred to Demographics, Gregson is unsympathetic that Holmes and Watson can't find a suitable detective to partner with. Gregson attends the scene of a headless body found in a barrel by Bell and later, when the body is identified as former mobster Bobby Pardillo, is at the Morgue as Bobby's father Robert identifies the body. When a member of a rival family to the Pardillo's is blown up, Gregson is concerned that if they don't find the bomber quickly, a mob war is imminent. Gregson is part of the team that arrests Deputy Commissioner Frank Da Silva and thanks Holmes for mending his relationship with Bell and getting Bell to return to the precinct.
"Dead Clade Walking": After Watson and Gay find a rock with a rare fossil contained in it in the yard of a murder victim, Gregson and a police team apprehend the best friend of the victim and question him about the fossil. The fossil is put into the evidence locker at the precinct where it is stolen by a man posing as an ICE agent. Gregson rebukes the officer in charge of the evidence locker. After apologizing to ICE, Gregson arranges for them to work with the precinct on recovering the fossil. Gregson attends the murder scene of a seller of rare items where the fossil is found smashed.
"Corpse de Ballet": Gregson attends the scene of a murdered ballerina, Nell Solange, who was cut in two. He's one of the team that questions the lead ballerina, Iris Lanzer, a suspect in Nell's death. When Lanzer's alibi proves false, Lanzer is brought to the precinct. Refusing to remain in the country, Gregson orders her arrest. In a courtroom bathroom, after Holmes confronts Lanzer's lawyer with evidence that he was behind the murder, Gregson has Bell arrest the lawyer.
"The One Percent Solution": After a bomb at a restaurant kills staff from two banks and the Depts. of Treasury and Labor, Gregson indicates to Holmes and Watson that they'll have to work with Gareth Lestrade, who is a security consultant for Richard Balsille, the CEO of one of the banks. Gregson calls Holmes that newspapers received a statement from a serial bomber taking credit for the bombing. He attends the home of the suspected serial bomber who is found to have died before the bombing took place. He arrests the bomber, Michelle Forrester, an employee of the Dept of Labor.
"Ears to You": Gregson questions Gordon Cushing, whose ex-wife Sarah went missing years before. Gordon's received a package with two severed ears and a ransom demand. He leads a police team that monitors Gordon delivering the ransom but when the kidnapper takes the money and runs down a subway tunnel, Gordon chases after him. Gregson finds that Gordon has killed the kidnapper with a metal rod. Later at the precinct, Gregson and Bell question Gordon on the events that led to the kidnapper's death. After Holmes and Watson discover Sarah is alive and living under a new identity, she's brought to the precinct where it is found that her doctor husband grew two ears on her back. Gregson serves her with a warrant for her DNA.
"The Hound of the Cancer Cells": Gregson attend the scene of a medical researcher, Dr. Barry Granger, who appears to have died from suicide, but Holmes shows was murdered. He's involved in the questioning of Karen Buckner, who anonymously partnered with Granger on-line in revealing crooked drug trial results. When the wife of Hank Prince, Granger's business partner, is shot dead, Gregson questions Hank at the precinct who provides an alibi. Later, he, Holmes and Watson show Hank evidence that his alibi was a lie and that he staged Granger's suicide to temporarily devalue his company's worth so that his wife wouldn't receive a big payout from their divorce proceedings.
"The Many Mouths of Aaron Colville": After a serial killer who bit his victims, is found to be striking again, Holmes and Watson are able to find a match to the bite marks. With Gregson, they question an ex-con of Newgate whose dentures are revealed as the match. He tells them that many dentures were made and the model for them was Aaron Colville, who died years before. Gregson orders all those who were issued the dentures questioned. The dental assistant at Newgate, Stan Divac, flees resulting in Gregson issuing a warrant for his arrest. Divac is captured and questioned by Gregson but Watson shows Divac has severe osteoporosis and from physical evidence shows he couldn't have been involved in the murders. Gregson, Holmes and Watson arrest Aaron Colville's mother, Ruth, who committed the murders and left bite marks on the victims using her dead son's dentures.
"No Lack of Void": Gregson asks Watson to look at a man who collapsed in a holding cell and finds he died from anthrax poisoning. He provides Holmes and Watson with video footage of Union Square in order to find the anthrax source. He leads an ESU team who raid a storage unit and find the anthrax creator is dead and the anthrax is missing. He leads a task force in finding Eugene MacIntosh who is believed to have taken the anthrax. After Holmes finds an extremist, Joe Bey, who funded the anthrax creation, Gregson, Holmes and Watson are able to persuade him to locate Eugene. Gregson isn't happy that Holmes needlessly risked his life to bring Bey in. Gregson tells Holmes and Watson that Eugene was shot dead by his brother Bart at his farm. At the precinct, Gregson questions Bart who claims Eugene was trying to poison his cows with the anthrax and shot him in self-defense. He's part of the team who later arrest Bart at his farm when it's discovered Bart had the anthrax and intended to poison his cows for the insurance money.
"The Man With the Twisted Lip": While looking for Paige Dahl, Holmes turns in a drug delivery service to Gregson. After the murder of drone operator Zack Piller, Gregson and Bell pressure his therapist to reveal Piller's involvement in a drone strike that killed Americans in Afghanistan. Piller is poisoned by a small drone and dies in "the box" in front of Bell and Gregson.
"Paint It Black": Captain Gregson does not appear in this episode.
"Art in the Blood": Gregson is called to the Morgue where Sherlock and Watson have found that the arms of Arthur West have been taken. Holmes lies to Gregson how they came upon the discovery. Days later at the precinct, Gregson tells Sherlock that the gun used to kill West has been found with fingerprints. Sherlock recognizes the prints belong to his brother Mycroft and realizes he's being framed for murder.
"The Grand Experiment": After Bell discovers the prints on the gun used to kill Arthur West belong to Sherlock's brother Mycroft, Gregson warns Sherlock that if he's found and arrested, it could compromise Sherlock working with the NYPD. Bell, Gregson, Holmes and Watson present Julian Afkhami with evidence that he murdered Nadir Khadem and he is arrested. Afkhami was a spy used by MI6 mole Tim Sherrington who is also found dead, resulting in Gregson issuing a BOLO for Mycroft.

Season 3[]

We're not friends. I like you, I want good things for you, but our relationship...it's a means to an end as much to me as it is to you.

— Gregson to Holmes, "Enough Nemesis To Go Around"
S03E08-Gregson angry

Thomas Gregson Season Three/Gallery

After Holmes asks to consult with the NYPD again, Gregson will only approve him and Kitty Winter working with them if Watson agrees. Gregson punches his daughter Hannah's NYPD partner, Chris Stotz, after learning he was abusive to her. Gregson deals with a killer of two officers who is intent on robbing the police of weaponry. Gregson calls Holmes to the scene of a murdered woman who bears the same torture marks as Kitty, indicating that her kidnapper is in NYC. He's drawn into the hunt for Simon de Merville, who is believed to be a serial killer and abducted Kitty. After learning Kitty abused Violet de Merville into helping police find Simon, he suspends her from working with the NYPD. He insists Watson not take a leave of absence and continue working on prosecuting Del Gruner. When Gruner is found disfigured, he suspects Kitty is responsible and tells Holmes he'll have to go after whoever tortured him. After Watson's boyfriend Andrew is poisoned by an assassin hired by Elana March, Gregson assigns police protection to her. When two detectives from another precinct believe Holmes is a suspect in the murder of Maria Gutierrez, Gregson defends Holmes. After Watson helps Hannah with a case resulting in Hannah acting with selfishness and duplicity, Gregson apologizes for her and asks Watson to not help Hannah again. Gregson turns down a promotion to deputy chief and is warned he was supposed to have taken it.

Appearances in Season 3
"Enough Nemesis To Go Around": Gregson arrests Elana March who is later released and accuses Watson of stalking her which results in Gregson warning Watson that March is really indicating that she can have her killed. Gregson passes on a tip to Detective Bell and Watson of a suspect, Kevin Elspeth, in the mysterious shooting death of March's accountant who was to testify against her. After Holmes asks to consult with the NYPD again, Gregson will only approve him and Kitty working with them if Watson agrees. He and Bell question Elspeth who denies committing the murder and won't provide a fingerprint sample.
"The Five Orange Pipz": At the scene of the murder of lawyer Theodore Fordham, Gregson answers Fordham's phone and hears the shooting death of fugitive Elias Openshaw. Gregson brings FBI Agent Boden to the 11th Precinct who was trying to find Openshaw and fills them in on his case. Gregson is part of those who question Gabe Coleman whose son was poisoned by toy beads (the "Pipz") that Openshaw's company sold. Gregson later confronts Agent Boden after it is found he withheld information on the case. He's then part of the team that accuse ADA Angela White of bribing Fordham and allowing Openshaw to become a fugitive so that it wouldn't be revealed that she lost evidence in the case against Openshaw. After Boden becomes a fugitive and is found to have stolen the Pipz, Gregson and a police team arrest him.
"Just a Regular Irregular": On a math puzzle hunt, Harlan Emple finds a dead body and is accused by Gregson and Bell of the murder. Holmes vouches for Emple and Gregson reports that Emple was teaching a class when the murder occurred. After Bell and Holmes are nearly hit by a shotgun blast through a motel door, Gregson attends the scene. Gregson and a police team arrest the murderer, Paul Ettinger.
"Bella": After Edwin Borstein, head of an artificial intelligence company is murdered, Gregson is part of teams that question suspects Michael Webb and Isaac Pyke.
"Rip Off": Gregson punches his daughter Hannah's NYPD partner, Chris Stotz, after learning he was abusive to her. Hannah is not pleased with way he handled the situation, feeling he has caused talk among her fellow officers. Gregson discusses the situation with Kitty and she helps him understand his daughter's position, and her desire to keep from appearing as a victim to her colleagues. Gregson eventually agrees to shake Stotz's hand in front of his precinct. Statoz tells Gregson he is quitting the force and seems scared. Gregson then realizes that Kitty intimated him.
"Terra Pericolosa": Gregson attends the scene of a robbery of maps and a murder at a library. He informs Holmes that the map thief, Stuart Zupko, has been found murdered in his framing store. The woman who family donated a map to the library, Margaret Bray, is told of the theft by Gregson and that the killer may be after her. Later, Bray is brought to the precinct and Gregson is one of those that show her proof that she hired and killed Zupko.
"The Adventure of the Nutmeg Concoction": Holmes and Watson fill Gregson in on their case involving numerous crime scenes in which the bodies were also disposed of by the same "cleaner" who used a solution that smells like nutmeg. Gregson secures Holmes' release from arrest after he tries to find the cleaner using a staged homicide. He and Bell interrogate Conrad Woodbine after Holmes, Watson and Kitty find the concoction at his art studio. Gregson offers former Armenian gang leader Artem Dedekian an immunity deal after learning that he used Woodbine's services.
"End of Watch": At the scene of the murder of Officer Alec Flynn, Holmes shows Gregson that Flynn's weapon was replaced with an air gun pistol. He leads the precinct in the "end of watch" ceremony and questions Flynn's former partner to see if he replaced Flynn's weapon. After it is discovered that Flynn sold his service pistol and was robbing the police armory, Gregson cancels Flynn's inspector's funeral. After a second officer, Casey Hatem, is killer by Niko Buros, the same man who killed Flynn, Gregson has to establish that Hatem wasn't involved in selling guns to Buros. Holmes deduces that Buros is killing officers in order that an inspector's funeral will be held and draw officers away from the armory. Gregson orders police to the armory too late to prevent its weaponry from being stolen by Buros. After Buros is arrested by Detective Bell and walks through a cordon of officers, Gregson glares at Buros angrily.
"The Eternity Injection": Gregson meets Mason at the precinct who finds Chris Jacoby using facial recognition software. Bell and Watson report to Gregson that an illegal clinical trial on a drug called EZM-77 is responsible for brain damage suffered by Jacoby before he was killed. Gregson and Bell question the one surviving participant in the trial, Louis Carisle, who provides them with a description of the man who was running the trial. He and Bell interrogate the man Carisle desribed, Dr. Dwyer Kirke, who admits to running the trial and will take responsibility for the deaths but won't reveal who funded the trial. When the man who funded the trial, James Connaughton, is found but there is no evidence to prosecute him, Gregson is part of the team who convinces Connaughton's nurse, Brett Won, to provide information that leads to Connaughton's arrest attempt.
"Seed Money": When geneticist and botanist Clay Dubrovensky is murdered and discovered to have been growing pot for a Brazilian gang, the SDS, Gregson is at the scene when Clay's grow house is found. He helps Kitty question Grant Perryman in the disappearance of a young woman, Tess Jantzen. At the scene of the burning deaths of two executives of AgriNext, he's part of the team who question AgriNext executive Barbara Conway. Conway reveals that her company was trying to buy Clay away from the SDS to work at AgriNext. When the murderer of the executives is caught, Gregson tells Holmes that the man confessed but not to killing Clay. Later, he calls Holmes to the scene of a murdered woman who bears the same torture marks as Kitty, indicating that her kidnapper is in NYC.
"The Illustrious Client": After the body of Melanie Vilkas is found with the same brand marks as Kitty, Gregson pulls Detective Whitaker off Vilkas' case and assigns it to Kitty, Holmes and Watson. He and Bell question Ron Davis, a man who was supposed to have met Vilkas for a date the night she disappeared. After it's established that Simon de Merville abducted Vilkas, Gregson leads a police team that find he's been running a sex slave brothel in a house. Gregson finds a poker with the same marking used to brand Vilkas and Kitty. Gregson is part of the team who question Simon's sister, Violet and he arranges for her phone to be traced when Simon responds to a message she leaves for him. He's at the scene when Simon's body is found inside a burned boat parked in a driveway. When Violet shows him proof that Kitty coerced her cooperation by beating her, he tells Holmes that he's suspending Kitty from working with the NYPD. He allows Holmes to break the news to Kitty.
"The One That Got Away": Gruner is approached outside his residence by Gregson and Bell and taken to the 11th Precinct for questioning. With his lawyer, Gruner denies involvement in the murder of Melanie Vilkas and Simon de Merville. Gregson notices two of Gruner's fingers had healed from being broken which he says happened while boxing. Gruner's lawyer ends the questioning, threatens to sue the department and lauds Gruner's charitable efforts and character. Having watched the questioning, Watson offers to take a leave of absence so the precinct can't be accused of retaliating against Gruner for him firing Watson, but Gregson insists they pursue the case against Gruner together. After Gruner is tied to a missing woman through her child, Gregson leads a police team that raids Gruner's home. Later, he calls to tell Holmes and Watson that Gruner has been captured. In a hospital, Gruner lies in a bed and Gregson tells them that Gruner's face has been eaten away by a corrosive. With a knowing look, Gregson tells Holmes that he'll have to go after whoever disfigured Gruner.
"Hemlock": Investigating the disappearance of Steven Horowitz, Holmes and Watson find signs of violence at his business and a piece of brain matter. Later, Gregson confirms the brain matter was Steven's. He and Bell interrogate one of Steven's employees, Eduardo Peña, and get him to relinquish a debt collection package belonging to Steven. Holmes shows Bell and Gregson that Steven forgave the money owed by one of his debtors, Owen Downey, but that criminal investors in the debt package may have killed Steven. Gregson is present as Steven's killer, attorney Colton Brown is shown the evidence against him. Gregson arrests him and warns that revealing the location of Steven's body is Brown's only bargaining chip.
"The Female of the Species": After Elana March hires an assassin to kill Watson but her boyfriend Andrew Mittal is poisoned instead, Gregson assigns her police protection. After Watson receives a letter from Jamie Moriarty indicating that she won't allow anyone to kill her, Gregson calls the prison March is incarcerated at and finds she has been killed.
"When Your Number's Up": Gregson shows Holmes and Watson the scene of the shooting of homeless man Henry Wilseck who was found while an envelope from the killer containing a note that rich people are worth more than the poor, a math equation and nearly $4000 cash. Later he tells Holmes and Watson that the killer sent another note to the media. After another man is killed with a note, it's discovered that they both had relatives on a fatal airplane crash. The CEO and lawyer of the airline meet in Gregson's office and detail their victim compensation options which Gregson realizes is motive for the killer to push the airline to benefit low-income victims. He later shows Holmes and Watson a news interview of Dana Powell, whose rich husband died in the crash and is pushing for a compensation plan that benefits the rich passengers the most.
"For All You Know": Gregson allows two detectives from another precinct, Demps and McShane, to question Holmes about the murder of Maria Gutierrez. Believing Holmes is a suspect due to a note he wrote Maria the day she disappeared, Gregson defends Holmes. After Holmes is arrested, he tells Watson that a witness reported that Holmes threatened Maria days before she disappeared. He, Bell and Watson show evidence to Councilman Barclay that he killed Maria and another woman.
"T-Bone and the Iceman": Bell, Holmes and Watson keep Gregson apprised of their progress in a case involving the stolen body of a cryogenically frozen psychiatrist and a mysterious man in a floppy hat who was seen at the site of the psychiatrist's murder, the strangulation of a leukemia sufferer who claims to have witnessed the psychiatrist's murder and an attack at the cryogenic facility.
"The View From Olympus": After ride-share driver and internet journalist Galen Barrow is run over by a taxi, Gregson is part of those that question his internet editor Lydia Guerrero who admits to having an affair with Barrow and being blackmailed. He, Bell, Holmes and Watson arrest a employee of the ride-share company, Brandon Falchek, who had Barrow killed after he came too close to exposing the blackmailer at his company which would have also exposed Falchek's use of the ride-share app to stalk a woman he was infatuated with.
"One Watson, One Holmes": After Holmes and Watson discover that FBI Agent Branch is protecting Everyone member Brady Dietz, aka "Tessee", for the murder of Errol White, aka "Species", they unsuccessfully ask Gregson for help pressuring Branch into giving up Dietz.
"A Stitch in Time": Hannah asks for Watson's assistance with a case involving a string of robberies. Watson pieces the case together and gives Hannah the information to take to the lead detective on the case. She then discovers that Hannah has chosen to act on the information herself to win a commendation and advance her career as opposed to following proper procedure. Gregson learns of the situation and advises Watson not help Hannah again.
"Under My Skin": Bell shows Gregson the body of an unwitting drug mule who was murdered in an ambulance. Dealing with a Brazilian counterpart, Gregson identifies a Brazilian doctor who placed heroin inside patients from the US in order to smuggle it. He calls Holmes and Watson to the scene of the shooting of a known drug gang leader, Janko Stepovic, who Bell and Watson had arranged to meet with the drug smuggler. A dentist, Marty Ward, whose office Janko was using to conduct business, comes to the precinct with his lawyer and offers information on Janko's operation in exchange for an immunity deal which Gregson facilitates. After Watson examines the bodies of other unwitting drug mules and realizes that Ward is the smuggler, he's brought into Gregson's office and after being shown the evidence against him, Gregson, Bell, Holmes and Watson trick him into confessing.
"The Best Way Out Is Always Through": After Judge Vaughn is murdered, a woman he slept with, Loretta Nichols, is questioned by Gregson, Holmes and Watson but she has an alibi. Trent McCann, a deputy warden at a for-profit prison is killed and Gregson informs Bell, Holmes and Watson that a 9mm was used to kill him and despite searches by many law enforcement agencies, the primary suspect, Nikki Moreno, hasn't been found. After Moreno's body is found, they show Gregson photos of the crime scene where it's proven that McCann strangled her with a garrotte. At Gregson's office, Watson reports that a gang that McCann showed favor to in prison, the Zaleskys, had no activity in Judge Vaughn's district and have no motive to kill him. As it's an election year, Gregson is receiving a lot of pressure from the New Jersey governor's office to solve the case. Gregson leads the team that arrests an executive of a for-profit prison company, Perry Franklin, who was behind the killings in order to create a political scandal that would result in a contract being awarded to his company.
"Absconded": Gregson is offered a promotion to deputy chief. He considers it, even getting Watson to investigate his possible successor, however he ultimately decides he is happy with his current position. However, he's warned that the promotion was supposed to happen.
"A Controlled Descent": After Alfredo Llamosa is kidnapped, Bell, Watson and Gregson question Neil Kopecky, who clashed with Alfredo at Castle Automotive and was fired. When Holmes is blackmailed by Oscar Rankin into searching for his sister Olivia in exchange for releasing Alfredo, Gregson is angry that Holmes didn't turn Oscar over to the police.

Season 4[]

I've worked for the Captain for a long time. He stuck his neck out for me and my partner more times than I can count. If he says he can take the heat for you, he will.

S04E15-Gregson civies

Thomas Gregson Season Four/Gallery

In the wake of Sherlock's relapse and assault on Oscar Rankin, Gregson is forced to end Sherlock and Watson consulting with the NYPD. Gregson is glad when Morland is able to arrange for Sherlock and Watson's return. He makes Watson aware of a fictional book written about her and Holmes which she discovers her father Henry authored. After a bomb goes off in the Morgue, Gregson is active in pursuing suspects including a Honduran gang and a disturbed young man. He brings Holmes into an operation with Narcotics to take down a biker gang. The case of the shooting of three Chinese traid members sees Gregson trying to stop a gang war in Chinatown. Watson discovers that Gregson has been secretly dating an ex-cop, Paige Cowan. A medical condition causes Paige to break up with Gregson but Watson helps them reunite. Gregson is involved in solving the murder of two men who were faking a murder. At Morland's office, Gregson questions Morland who denies being behind a shooting that killed one of his employees, Emil Kurtz. Gregson warns Morland that if anything happens to Sherlock or Watson, he'll exact punishment beyond the law. Involved in the arrest of a bomber, Ruslan Krasnov, who strikes at Morland's office, Gregson arranges a deal for Krasnov but he's shot in the 11th Precinct by an officer from another precinct.

Appearances in Season 4
"The Past Is Parent": Gregson visits the Brownstone and tells Watson that although he's vouched for Holmes with the D.A., he may be charged for the assault on Oscar Rankin. Later at the 11th Precinct, he tells Holmes that he and Watson cannot work with the NYPD anymore. Holmes tries to make a case for allowing Watson to continue consulting with them, but Gregson indicates that the Chief of Detectives' decision is final.
"Evidence of Things Not Seen": Captain Gregson does not appear in this episode.
"Tag, You're Me": In the case of the murder of doppelgangers Otto Neuhaus and Tim Wagner, Gregson, Sherlock and Watson interview another doppelganger, Evan Farrow, who indicates that Tim asked him to take a DNA test while pretending he was Tim. Gregson arranges for the chief of police in Oriskany Falls to question one of his officers, Sean Cudlow, after Tim Wagner is suspected of killing Sean's brother, Howard. Bell and Gregson hear Officer Sean Cudlow's confession that he killed Tim and Otto to avenge his brother's death. He's present as Curtis Tofano is shown the evidence that he killed a college pledge mate.
"All My Exes Live in Essex": Gregson arranges for five people who are all married to one another to be brought to the precinct and is part of interviewing them regarding the murder of Abby Campbell, who used to be part of their marriage. He arranges a warrant to collect Abby's test materials from biological waste bins after Holmes and Watson discover that she ran blood tests off the record. He, Bell, Holmes and Watson show Abby's husband, Dr. Nate Campbell, evidence that he's been misdiagnosing patients on purpose and that he killed Abby when she discovered his malpractice.
"The Games Underfoot": The stabbing and burning death of archaeologist Eddie Ross, leads Holmes and Watson to discover that he may have been killed over a dig. A man discovered at a dig site, Tyler Eggert, explains to Gregson, Bell, Holmes and Watson that he and Ross were seeking a buried cache of valuable old video games, "Nottingham Knights." After finding that the cache of games was discovered years ago, Gregson authorizes a CSU team to examine Ross' dig, believing that he found something else that resulted in his death. He's part of two interrogation sessions with Duncan Brice, a developer, who had Ross killed after he discovered toxic waste buried in a development site.
"The Cost of Doing Business": Gregson and Bell attend the scene of a sniper attack and are puzzled how the sniper rifle was smuggled into the building. After Sherlock finds the sniper is in a hotel, Gregson briefs an ESU team who assault the sniper's room, however, the sniper falls from a fire escape to his death. He's part of the team that shows Bill Wellstone, CEO of a large energy company, evidence that he smuggled the sniper rifle into the building in a golf bag. Wellstone had a rival, who was having an affair with a woman Wellstone was having an affair with, shot by the sniper.
"Miss Taken": Gregson makes Watson aware of a fictional book written about her and Holmes which she discovers her father Henry authored. He's in the Morgue with Bell and Holmes and gives them details on the remains of retired FBI Agent Robert Underwood, whose body was put through a wood chipper. When Holmes discovers Underwood was reviewing an old case of a kidnapped girl, Mina Davenport, who escaped her abductor and returned a few years previously, Holmes finds that "Mina" is an imposter. He and Watson show Gregson a picture of Mina at age 4 and the imposter. Their ears are different shapes and Joan points out that ears don't change shape as people grow. Gregson mentions that DNA from four year old Mina's toothbrush matched DNA from the imposter. Even though the toothbrush disappeared after the test, Gregson finds it hard to believe that the Davenports wouldn't recognize their daughter. He's convinced to share their concerns with the Davenports, bring them to the precinct and collect DNA samples from them to compare to the imposter. An explosion at the Davenport's, secretly arranged by Holmes, results in Bell and Gregson searching the home. Later, Gregson is among those who are surprised when DNA from the imposter is a familial match to the Davenports but Holmes believes he knows why.
"A Burden of Blood": Gregson shows Holmes and Watson the body of Ellen Jacobs. Attacked from behind in her car, the killer suffocated her with a plastic bag. After discovering Ellen was pregnant by her realtor, Warren Clift, Gregson and Bell visit Clift's office where they are told her was attacked and is in hospital. Gregson, Holmes and Watson visit Clift in hospital where he denies killing Ellen and believes he was attacked by Ellen's husband, Ernie. Gregson has Bell arrest Ernie after evidence of the attack is found. Holmes finds that Ellen's brother Craig murdered her and Gregson, Holmes and Watson present the evidence against him at the precinct and pressure him into confessing.
"Murder Ex Machina": After a Russian oligarch, Maxim Zoltov, is gunned down, Gregson attends the scene. He and Sherlock question the CEO of a company that was in negotiations with Zolotov to supply automation for the port of New Haven, which Zolotov intended to buy. He then questions Harry Magarac, head of the MYC dockworkers union who, provides an alibi. When it's discovered that Zolotov was representing the Russian government in negotiations to end the war with the Ukraine, undersecretary Cindy Park meets with Bell, Gregson, Holmes and Watson in Gregson's office and has federal agents take over the case from the NYPD.
"Alma Matters": After two people associated with for-profit Fairbridge university are killed, Bell and Watson tell him they were staged as robberies to hinder a Dept. of Education investigation into illegal recruiting practices by Fairbridge. Gregson calls Holmes and Watson when a former student and ex-con, Victor Nieves, is identified as a suspect in the murders. After Bell and police can't find Victor at his house, Gregson surprises Bell with news that Victor has turned himself in and confessed to both murders. After Holmes questions Victor and shows evidence that he couldn't have committed one of the murders, Holmes tells Bell, Gregson and Watson that the university CEO, Wilson Trager, is using in-debt students who were ex-cons to commit various crimes in exchange for debt relief.
"Down Where the Dead Delight": After an explosion in the Morgue that kills Nicole Slater and injuries Dr. Hawes, Gregson tells Hawes that a bomb was planted in a body cooler. After discovering that five other bodies in the Morgue belonged to the gang Sombra Roja, Gregson and Watson question a lawyer for the gang who shows them that the gang wasn't responsible for the bombing. Holmes discovers that the explosion's purpose was to destroy the body of an unknown woman who was in the Morgue. Showing Gregson pictures of the woman, Watson identifies her as a roller derby player from a tattoo. Gregson, Bell, Holmes and Watson are able to get Neil Dannon, father of Toby, who bought drugs from the tattooed woman, Janet Heffernan, to confess to her murder and the bombing.
"A View with a Room": Gregson introduces Holmes to Captain Will Lombardi, head of the Narcotics Unit. He asks for Holmes' help stealing from a drug-dealing biker gang, "Satan's Brood." Gregson later informs Holmes that Lombardi's undercover detective, Dunning, was killed the the operation is off. Gregson shows Bell, Holmes and Watson video from Dunning's hidden camera which indicates the gang didn't know he was a cop. He also says that the gang's bunker was raided. After the gang's leader, Nick Farris, is captured, he's questioned by Bell and Gregson and he shows that the gang didn't kill Dunning. Holmes shows Gregson and Lombardi evidence that Dunning and an accomplice staged the video after which the accomplice killed Dunning. The accomplice is discovered to be a CCU detective, Lisa Hagen, who is brought to Gregson's office where she's told the evidence against her.
"A Study in Charlotte": The mushroom poisoning of a professor and his students leads Holmes and Watson to discover that the student who supplied the professor with the mushrooms, Charlotte Konig, was also poisoned. In the Morgue, Gregson asks about a "R.A.C.H.E" tattoo on Konig's body which later turns out to be significant in solving the case. He's part of the team that questions Gira Pal, VP of a chemical company that Konig was suing. Later, he and Bell question Konig's boyfriend, Griffin, over the sale of counterfeit erectile dysfunction pills they were making.
"Who Is That Masked Man?": Gregson walks Holmes and Watson through the scene of the shotgun murder of three Chinese gangsters in an arcade they owned. Members of the "Snake Eye Boys", Gregson is worried that the murders could result in a gang war with rival gang "Ghost Mountain." Gregson brings together the leaders of the two gangs, Meng and Xi, and with Bell, shows them evidence that a white man killed the gangsters, which, averts a gang war. After Holmes finds the murderer was a mortician, Sven Eklund, who used a mask to impersonate a gang wife, Bai May-Lung, to gain entry into the arcade, Gregson leads a raid on Eklund's home but he's absconded. Bell shows him shotgun shells, pictures of Bai, Meng and a Latino man and, evidence that he's created masks of all of them. Later, Gregson tells Watson that Eklund has been captured. At the precinct, he and Bell question Eklund who provides details of the murders but won't tell them his motive.
"Up to Heaven and Down to Hell": At a restaurant, Watson runs into a surprised Captain Gregson who uncomfortably introduces Watson as a doctor to his companion Paige Cowan, and leaves. The next day at the precinct, Gregson tells Watson that Paige used to be a cop. However, she was part of a scandal that resulted in her quitting. She insisted on their relationship being secret so that her past wouldn't reflect poorly on Gregson. Paige figured out that Watson worked with Gregson and as a result, she broke up with him. Gregson is part of the questioning of Dr. Alan Graham, who replaced his mother's medication in order to make her seem incompetent so that her will could be invalidated. Paige visits Gregson and tells him that the real reason she broke up with him is that she has MS and doesn't want to burden him with the effects the disease will have on her. At a café across from the bookstore Paige works at, Watson meets Gregson. Having looked into MS, Gregson wants Watson's medical advice before approaching Paige and telling her that he still wants to be with her. Watson tells him what to expect but also that he'll have his friends' support. Seeing Paige return from lunch, Gregson nervously leaves to see her.
"Hounded": After it's discovered that Charles Baskerville was killed and Henry Baskerville attacked by a robotic machine resembling a dog, Gregson views the machine and is told by Holmes that it was developed by a company that bought patents from several other companies. The company that built the machine, Stapleton Innovations, admits to losing one of the machines and when their CEO, Rodger Stapleton, is discovered to have lied about his alibi, Gregson, Bell and Watson interrogate him.
"You've Got Me, Who's Got You?": After a street vigilante who dresses up as the comic book character the Midnight Ranger, is shot and killed, Gregson pulls Bell and Watson into his office and shows them video that another person is acting as the Ranger.
"Ready or Not": After doomsday prepper Vincent Bader is found dead, Gregson and Bell break the news to his wife Jennifer who says she found that Vincent spent $100,000 on something called "The Keep." When Holmes discovers that Bader was killed in The Keep, Gregson is part of the team that interrogates its owner, Ronnie Wright. Gregson tells Bell, Holmes and Watson to verify Wright's alibi and get him to provide the list of The Keep's members. Later, Bell and Watson show Gregson that Keep member Clyde Staller signed on due to Bader's recommendation and suspects he killed Bader when he discovered The Keep was fake. He, Bell, Holmes and Watson present evidence to Vincent's business partner, Ira Wallace, that he killed Bader in The Keep.
"All In": After a robbery at a penthouse poker game results in the death of the lookout, Bell and Gregson are angry to find the penthouse owner has been renovating, which makes examining the scene difficult. Noting that Lin Wen also had a contractor fix the ceiling bullet holes, Bell notices the ceiling light above where the poker table was, is peculiar. At the 11th Precinct, Bell shows Holmes that the light has a wi-fi spy camera in it. When the architect of the robbery is revealed to be a Turkish double agent, Szofi Demir, Gregson, along with Holmes, Watson and NSA Agent McNally are able to get a confession from Szofi who reveals who she is spying for to McNally.
"Art Imitates Art": After Phoebe Elliot, whose selfie had been made into a popular work of art, is murdered, Bell, Holmes and Watson show Gregson that the selfie provides an alibi for convicted murderer, Louis Bowman, leaving a college library when Marissa Kagan was killed. Gregson notes the case against Bowman showed his spit on Kagan and that Phoebe, a friend of hers, testified against Bowman. Bell and Gregson question Phoebe's brother, Keith, who insists he didn't kill his sister and that his DNA, found in the car that was used in her murder, was planted. Gregson is involved in the questioning of a forensics lab supervisor who falsified DNA test results and later, questioning of State Trooper Amanda Neal, a close friend of Kagan's. When Phoebe's murder is shown to be ADA Christian Pullman, who prosecuted Bowman, Gregson shows her that her wife, Teri, confessed to killing Kagan and that Pullman killed Phoebe to protect her.
"Ain't Nothing Like the Real Thing": The staged murder of Jerad Talt and Butch Callahan results in Bell, Holmes and Watson showing Gregson that pictures taken by Callahan of Jerad differed from what was found at the scene. Puzzled why the murders were staged, Watson reasons that Talt was the target. Gregson reports that Talt's wife, Ida, was upstate for the evening and is returning. He tells Bell and Sherlock to question Callahan's girlfriend, Roxanne Ortiz, while he and Watson see Jared's business partner, Davis Potter. Later at the precinct, the evidence is reviewed with Gregson pondering what the staging was to have accomplished. Bell and Sherlock indicate that Callahan bought a pen recorder and believe that he and Jared intended to blackmail whoever hired Callahan to really kill Jared, after showing him the staged pictures. He and Bell question Ida who believes that Potter arranged to kill Jared. At Potter's house, Gregson, Sherlock and Watson find he's not at home and believe that he hired Callahan to kill Jared even though he has a solid alibi. After Gregson leaves, Sherlock breaks into Potter's garage, intending to look at the contents of several file cabinets. He's involved in the questioning of Potter in "the box" where Potter confesses to hiring Callahan to kill Jared but not to hiring a second hitman to kill them both. He's part of the team that presents evidence to Ida Talt that she killed Jared and Callahan after finding Jared was planning on leaving her.
"Turn It Upside Down": After a diner shooting in which the target was an employee of Morland's, Emil Kurtz, who was a mole in Morland's organization, Sherlock tells Gregson that he suspects Morland of being behind the shooting. Bell and Gregson elicit a confession for the diner shooting from Arthur Tetch and he provides details of how he was hired. At Morland's office, Gregson questions Morland who denies knowing Tetch and tells Gregson that despite Sherlock's suspicions, he wasn't behind the murders. Gregson warns Morland that if anything happens to Sherlock or Watson, he'll exact punishment beyond the law. He's part of the team that questions Dr. Warren, who confesses to using a survey to identify and recruit psychopaths.
"The Invisible Hand": Gregson is at the scene after a bomb explodes in Morland's office and evacuates officers from the building. After the bomber, Ruslan Krasnov, is captured, Gregson offers Krasnov a deal in exchange for cooperation, but he refuses. Bell, Sherlock and Watson find evidence of a murder Krasnov committed which they show to Gregson. Krasnov agrees to cooperate and Gregson arranges an Assistant District Attorney to see Krasnov, but he's shot in the 11th precinct by an officer from another precinct. As Gregson tries to find a reason for the officer's attack from his captain, Bell confirms Sherlock's suspicion that the officer was one of those identified by the DANTE survey as psychopath. Gregson is incredulous that an officer would commit such an act but Sherlock posits that he was blackmailed into his actions.
"A Difference in Kind": Captain Gregson does not appear in this episode.

Season 5[]

This squad is the finest group of men and women I've ever had the honor to serve with.

S05E04-Gregson uniform portrait

Thomas Gregson Season Five/Gallery

Gregson heads up the search for a serial bomber in Flushing. After Holmes discovers that Gregson's girlfriend Paige Cowan is going deep into debt paying for her multiple sclerosis treatments, Holmes encourages him to marry Paige for the health benefits. However, Paige eschews marriage even though Gregson would like to wed her. Holmes is able to change Paige's mind, provides an engagement ring to Gregson and arranges for Paige to meet him at the 11th Precinct so he can propose. When the Major Crimes division is given an award by the city, Gregson ensures that Holmes and Watson are included. Gregson is very involved in bringing Ryan Decker, who keeps women captive as sex slaves, to justice. Jack Brunelle takes hostages in a diner, including Watson, inciting an ESU Captain to deploy a sniper. Gregson ensures the hostages' safety by stopping the sniper from taking the shot and eventually, all are released. Gregson bears no ill-will towards Kitty when she returns to NYC to investigate a case and helps her gain access to materials. After the assault on Detective Bell's girlfriend, ADA Chantal Milner, Gregson is involved in finding her attacker and the murderer of Roy Booker. Gregson deals with stopping a war between the SBK and Mara Tres gangs and solving the murder of the sister of Halcon, leader of Mara Tres.

Appearances in Season 5
"Folie a Deux": At a bombing scene in Flushing, Gregson and Detective Bell relate to Holmes and Watson that the bomb was made from bleach and potassium chloride, the bomber's recipe, and detonated remotely but nearby. He's part of the team that question Elizabeth Resor, ex-wife of suspect Nathan Resor. After a second bomb goes off, Gregson calls Watson and eliminates Nathan as a suspect since he was under surveillance when the bomb went off. He's part of the team that interrogates the bomber, Clay Fielder, and try to get him to give up who his accomplice is.
"Worth Several Cities": After Holmes is employed by a gang leader, Halcon, to determine who killed a smuggler and some of the gang's men, Holmes finds the smuggler was robbed by a North Korean ship captain, Pak. Gregson, Holmes and Watson question Pak who admits to the robbery and murders but the evidence shows he wasn't involved. Pak admits that the smuggler robbed his shop of an important item in a box. Later, Holmes shows Gregson that the item was the Imperial Jade Seal of China.
"Render, and Then Seize Her": In his office, Gregson and Paige Cowan eat dinner and discuss Paige's pending test results for her multiple sclerosis. After Beth Stone is kidnapped, Holmes finds motive from a film that Beth's husband, Aaron, video production company converted. Gregson and Watson arrest a man with mob ties, Peter Dinacio, who is seen on the film killing a man missing for decades. Dinacio shows them that the video was faked with CGI software created by Dennis Karig, who worked for Aaron's company. Having discovered that Paige is going into debt paying for the costs of her treatments, Holmes encourages Gregson to marry her for the health benefits. However, Paige eschews marriage even though Gregson would like to wed her. Gregson informs Bell, Holmes and Watson that Beth has escaped her kidnappers and later, is part of the team that shows Aaron evidence that Beth faked her kidnapping in concert with Karig in order to prevent Aaron from divorcing her before receiving wealth from the CGI software. To his surprise, Gregson finds Paige waiting in his office. Holmes explains that he's changed her mind about marrying Gregson and Holmes opens a case with numerous rings. Encouraging Gregson to take one and propose, Holmes indicates that he's doing this because it's what Gregson wants. Gregson takes a ring and approaches a smiling Paige.
"Henny Penny the Sky Is Falling": When the city wishes to recognize the Major Crimes division, Gregson wants Watson and Holmes included in the commendation. Holmes is against this and tries to sabotage Gregson's efforts with his higher ups, while Watson tries to encourage the recommendation. Watson eventually convinces Holmes to accept the honor.
"To Catch a Predator Predator": After Damien Novak is shot at a motel and suspected of being a predator of under-aged girls, Gregson is briefed by NY Detective Brooks on five men who were catfished by a man who would then tie them up and beat a confession that they were predators which he filmed. Later, he's shown evidence by Bell and Watson that Damien was the catfisher. The man Damien was supposed to meet when he was killed, Winston Utz, gives Bell, Gregson and Watson video of Damien crashing through his motel window and a white Camry speeding away in exchange for the police not telling his wife he was expecting to meet an under-aged girl. Gregson still plans to arrest Utz for luring a minor, even though though he was being catfished.
"Ill Tidings": With Holmes and Watson, Gregson examines the scene of the death of Head Chef Joe Leshner, by poisoned foie gras, at restaurant Arrondissement 21. He helps question cook Mateo Lima, who was also poisoned, but not fatally. At the Morgue with Dr. Hawes, Gregson reports that after seven customers were served the foie gras at a private lunch, one of them, Tate Orvis, died in hospital. At the 11th Precinct, Orvis' head of HR, Sydney Shea, is questioned by Gregson and Watson but she doesn't know who was at the lunch with Orvis. After Watson shows evidence that Orvis and Shea were having an affair, she confesses to it. When Holmes and Watson show Bell and Gregson that the poisoning was a ruse to rob the NYSE of $60M worth of art, Gregson approves their own ruse to use fakes of the art to flush out the robber.
"Bang Bang Shoot Chute": After parachutist Bennett Nealy is shot during a jump off a skyscraper, Holmes and Watson show Gregson that Bennett was operating a people smuggling business using a skydiving plane. Two of Bennett's customers, Qadir and Nazria Durrani, are questioned by Gregson, Holmes and Watson who discover that their son killed Bennett for having an affair with their daughter.
"How the Sausage Is Made": Gregson congratulates Bell for arresting the Cockburn father-daughter hit team.
"It Serves You Right to Suffer": Captain Gregson does not appear in this episode.
"Pick Your Poison": After Watson's medical license is stolen and used on fake scripts, Gregson tries to stop an investigation into Watson by DEA Agent Ritter. Holmes and Watson find the doctor who stole Watson's identity, Dr. Krieg, and Marla Moore, mother of one of her patients, Ethan Moore, dead in her office. At the scene, Gregson asks about the doctor's receptionist and indicates this will clear Watson with the DEA. Gregson gets Watson a warrant for Krieg's file on Ethan after she suspects that Marla was poisoning Ethan.
"Be My Guest": While at an auction house with Holmes making an arrest, Gregson breaks up an altercation between Holmes and Ryan Decker, which Holmes lies was a mistake on his part. later, Holmes reveals to Gregson that Decker is holding a woman prisoner as a sex slave. They're able to hold Decker on a trumped-up charge and get a warrant to surveil him and Decker is freed. Offering Decker a deal if he'll confess and give up his accomplice, he teases Gregson and Holmes and leaves. After police tailing Decker lose him, Gregson shows Holmes and Watson a map of the area that police lost Decker. Holmes suggests police narrow their search to the shoreline and the next morning, a detective shows Gregson, Holmes and Watson that a large bloodstain was found on a beach. Fearing the blood is the captive's, Preeda, Holmes searches the area and finds a set of keys. From the keys, a home is discovered that Gregson sends an ESU team to assault. Another captive woman is found and from soy milk, Watson deduces that Decker's partner is his ex-wife, Carrie Traub. Sending an ESU team to Traub's house, she's arrested and Gregson finds Preeda unharmed. Confronting Traub at the precinct, Gregson tells her that the blood on the beach was Ryan's. Unrepentant, she refuses to provide any information.
"Crowned Clown, Downtown Brown": After a dead clown is found in the woods outside Mount Pleasant, a second clown is brought to the precinct where Gregson, Holmes and Watson question him and discover they worked together for a marketing company. Bell and Holmes discover the clown was killed when he came upon someone poisoning NYC's drinking water with a virus and Gregson introduces Agent David Breslin from the Department of Homeland Security (DHS) and Wendell Hecht, VP of Water Integrity at NYC's Department of Environmental Protection (DEP) to Holmes and Watson. Hecht indicates that the virus survived the city's purification treatments and that emergency water reserves are being used. To Gregson's astonishment, Breslin refuses to specify what the virus is and insists that the contamination remain a secret. Holmes finds who created the virus and informing Breslin and Hecht, Gregson learns from Breslin that the contamination was leaked to the press. After Holmes finds that Hecht owns the patent on the only home water filtration system recommended by the DEP for the virus, Gregson is part of the team that shows Hecht the evidence against him and compel him to confess in exchange for a deal.
"Over a Barrel": After Jack Brunelle takes numerous people in a diner hostage, Gregson tells Holmes and Watson that Brunelle is demanding them or else he'll start shooting people. After nearly a day, the ESU commander sees that a curtain has dropped in the diner and a sniper has a shot at Brunelle, Gregson opposes the action. Holmes finds that Frank Trimble assaulted Brunelle's son, (Brunelle took the hostages to force Holmes to discover the assaulter) but since the statute of limitations on the crime expired, Trimble isn't charged. Holmes discovers that Trimble was in Canada at a hockey game for a day, extending the statute's period and Gregson is part of the team that shows Trimble the evidence against him and, arrests him.
"Rekt in Real Life": After eSports agent and streamer, O.G. Pwnzr, is smashed in the face with a gun while live streaming, Gregson's niece, Olivia, comes to the precinct. Explaining that Pwnzr used to be a pro video game player until becoming an agent. She stresses that pro players make millions and competition for the best players is fierce among eSports teams. After Pwnzr is found dead and the murder weapon found in the hotel room of new eSports star Tendu, Holmes shows Gregson that Tendu was the murder target, the killer tortured Owen until he gave up Tendu's location and when Tendu and the brunette fled, the killer planted the tool to frame him for Owen's murder. Gregson and Holmes question an animal rights activist, Rayna Carno and her lawyer, Gail Lundquist. He and Bell question the head of an escort agency, Carla Petro and later, he and Watson show evidence to Lundquist that she arranged for the attacks on Pwnzr and Tendu and arrest her.
"Wrong Side of the Road": After Kitty returns to NYC to warn Holmes that those that prosecuted a case in London involving Eli Kotite are all dying, after seeing Holmes and Watson, Kitty shakily assures Watson that she wrote to Gregson and resolved any concerns with how she left NYC. At the precinct, Gregson greets Kitty affectionately, much to her relief. Filling Gregson in on their suspicions concerning Kotite, he arranges for access to Cy Durning's autopsy. Knowing Bell will want to see her, Gregson leaves to get him. Gregson calls Watson to come to Cy's grave site and arriving with Holmes and Kitty, they find that Cy's body has been dug up and burned. Gregson indicates that they'll have his full support looking into Kotite, believing that after Holmes visited him, he arranged for the burning. Cy's wife Kate provides a description of a red-haired man she saw in front of their house before Cy died. At the precinct, Holmes shows Bell and Gregson a sketch he drew of the red-haired man Kate identified.
"Fidelity": Gregson, Holmes, Kitty and Watson question lawyer Sydney Garber who provides them with an intelligence information trove, the "Fidel Files." Later, after Agent Anson Gephardt is involved in a shootout with the FBI, Gregson gets Holmes into the shootout scene and protests when FBI agents won't allow the NYPD access.
"The Ballad of Lady Frances": After Darren Azoff is tortured and shot while a new listening technology, BulletPoint, records the crime, Holmes and Watson meet Gregson at the crime scene where no evidence is found leading Holmes to surmise that the shooting happened inside a vehicle. Gregson, Holmes and Watson hear the recording of Darren's torture at BulletPoint's office and the technology is explained to them. Later, Holmes and Watson brief Gregson and city political staff members that Darren was killed as he'd stolen a valuable guitar. He's part of the team that question Darren's killer, Reese Vennek, who tells them he found another murdered man, Cosmo Dellis, who works for BulletPoint. After discovering that Cosmo's killer is councilman Slessinger, who hopes to be elected mayor, Bell, Gregson and Watson show Slessinger the evidence against him and Gregson compels Slessinger to provide a DNA sample.
"Dead Man's Tale": Told by Holmes and Watson that a man found dead in a storage unit was killed over a 1700's ship's log book, Gregson is surprised to hear the motive may be to locate pirate treasure in NYC. Greson and Watson question a rich Saudi, Farhan Al-Asmari, who admits that he found the treasure detailed in the log book and gives them details where he bought the book.
"High Heat": Holmes shows Gregson that the murder of two men whose bodies were cremated was due to a shooting at a courthouse in 1987. Believing that a Carter Gibson was responsible, Bell, Gregson, Holmes and Watson visit Carter's home and find blood and signs of a struggle. However, Holmes shows them evidence that Carter was one of the victims. Gregson finds a partial footprint outside Carter's home. Later, after finding Carter had a hereditary disease, CMT, Bell and Watson tell Gregson that there was no CMT on either sides of Carter's family. However, his grandfather suspected that Carter's mother was unfaithful and this was the reason for his father's attack at the courthouse. Indicating they intend to find out if CMT was present in any of the families involved in the attack, Gregson cautions them to not tip off the assailant. Gregson is part of the team who hear a young baseball pitcher's coach, Paul Fontino, confess to the murders and later show the pitcher, Houston Spivey, evidence that he was the murderer.
"The Art of Sleights and Deception": Investigating the murder of magician "Razr" who was trying to discover the author of a 1963 card trick book to win a $2M prize, Gregson and Holmes question Lela, who was also obsessed with finding the author. Later in "the box", Gregson and Watson show Titus Gorham that, coerced by Roy Booker, he filed a false statement against Detective Bell and convince him to recant his statement.
"Fly Into a Rage, Make a Bad Landing": After the assault on Detective Bell's girlfriend, ADA Chantal Milner, Gregson meets Bell at the hospital and after providing his support, tells Bell that he needs to sit out the investigation. Gregson, Holmes and Watson question Chantal's ex, Roy Booker, and tell him that urine was found on Chantal's bed which will be compared to his DNA. Planning to visit the country club to obtain their video footage to check Booker's alibi, Gregson warns Holmes that the club is notorious for not cooperating with the police. Booker's DNA is a match for the urine but when his alibi checks out, Gregson calls Holmes and Watson that Booker has been found shot in his car, of an apparent suicide. At the precinct, Bell, Gregson, Holmes and Watson discuss Booker's death. Having found gunshot residue on his hand but his autopsy showing he was drugged, they believe his suicide was staged. Traces of THC from marijuana use weeks before were also found. Knowing he could be a suspect, Bell is reassured by Gregson they won't waste time investigating him. Gregson obtains a search warrant for a safety deposit box Booker maintained and at the bank, they find over $100,000 and a list of bank accounts belonging to husbands that Booker was surveilling for a law firm.
"Moving Targets": At the precinct, Holmes, Watson and Gregson are able to close a murder case involving a married couple. After a NJ Police Chief, Nanette Vlasik, is shot in a warehouse, Bell and Gregson meet a member of her unit, Lt. Morrison in the Morgue. He learns from Bell and Holmes that Vlasik was participating in a reality show when she was shot and, she met with a mob boss in a strip club he owned. He's part of the team that questions the president of a firearms company over bribery that Vlasik uncovered and helps set a trap for Vlasik's murderer, producer of the reality show, Jake Bozeman.
"Scrambled": Gregson is part of the police team at Shinwell's apartment after his murder and promises Watson they'll find his killer. Sherlock shows Gregson and Watson a WW2 encryption machine called "Enigma." Having spotted one in the head of SBK Bonzi Folsom's apartment, they tell Gregson that Bonzi is encoding orders in the messages in the filenames of his social media which gang members decrypt with their own Enigmas. After a bust of SBK gang members goes bad, Gregson reports it to Holmes and Watson and he's unsuccessful getting a warrant for Bonzi's arrest from ADA Nelson Lewis. Later, Holmes and Watson show Gregson past SBK victims were murdered to benefit Bonzi's brother, seemingly legitimate businessman Tyus Wilcox.
"Hurt Me, Hurt You": After SBK gang members are shot by the Mara Tres gang, Gregson meets Bell, Holmes and Watson at the Morgue and indicates police are on full alert to stop a gang war. Gregson and Watson are unsuccessful at getting Tyus to admit he's SBK's leader. Holmes shows Gregson a video of Mara Tres' leader Halcon's sister Carmen being tortured and delivering a message that SBK is responsible for her murder. A second talk with Tyus results in him admitting to leading SBK and that he'll find out who killed Carmen. Gregson calls Holmes and Watson that Tyus has returned to the precinct and offered full details of all SBK activities in exchange for immunity. Finding circumstantial evidence that Tyus lied about who killed Carmen, Gregson is unsuccessful at getting ADA Lewis to question him. After concrete evidence that Tyus killed Carmen is found, Gregson is part of the team that presents the evidence to Tyus and his lawyer which voids his immunity deal.

Season 6[]

You try to set it off, the only people who are gonna die today are you and your men. Your choice.

— Gregson, "Once You've Ruled Out God"
S06E02-Gregson gun

Thomas Gregson Season Six/Gallery

Holmes doesn't tell Gregson he's suffering from post-concussion syndrome (PCS). Gregson leads a police task force when a dirty bomb threatens NYC and is at the scene of the murder of a Revolutionary war reenactor. After Holmes can't remember how he acquired a human head, he tells Gregson about his PCS. Angry that Holmes didn't tell him earlier, Gregson suspends Holmes from working with the NYPD until cleared by a department doctor. Later, Gregson tells Holmes he's been cleared to work with the NYPD but if he violates any of the doctor's conditions, he'll be suspended permanently. Gregson's daughter Hannah tells him that she's going through recovery for alcoholism and he takes advice from Watson and Holmes how to help her. After Hannah's roommate Maddie is strangled by a serial killer, Gregson takes command of a task force to find the murderer. He's drawn into the pursuit of the killer, Michael Rowan. Gregson brings an expert on Egyptian antiquities onto a case who is later found to be corrupt and is murdered. He provides expertise in identifying ATF field offices as the recipients of off-the-books funding from an ATF operation's slush fund. Detective Bell turns down a chance to apply to the US Marshals until Gregson says how proud he'd be if Bell became one. When a bio-bomb is set off at the 11th Precinct, Gregson and Bell deal with the CDC and those that set the bomb off. Gregson turns down a potential replacement for Bell, favored by Holmes, concerned that the replacement wouldn't keep Holmes out of trouble. After Hannah kills Michael Rowan, Gregson helps her erase evidence of her crime but discovers afterwards that this makes Watson the prime suspect. Angry, he pleads with Holmes to not reveal Hannah's crime.

Appearances in Season 6
"An Infinite Capacity for Taking Pains": Investigating the murder of Sammy Olivetti, who had a sex tape of himself posted in the web, Holmes accepts a bribe to stop his invesitgation from an anonymous caller. He later tells Gregson he accepted the bribe in order to trace the money to the caller's bank account, but keeps his post-concussion syndrome (PCS) from Gregson. After the woman in the sex tape with Sammy, Sophie, is murdered, Gregson questions Sophie's husband, Ryan, who denies murdering his wife. Later at the 11th Precinct, Gregson indicates that since Sophie and Ryan had met with Olivetti several times, they believe Ryan had a key to Olivetti's house. This allowed him to enter without damaging the deadbolt but planning to hang up plastic and murder Olivetti, he activated it. Holmes turns on the TV which shows a tape from Olivetti's hidden camera in which Ryan smashes Olivetti's head. Gregson asks what he did with the body.
"Once You've Ruled Out God": At the Morgue, Gregson learns that a nuclear safety inspector was killed by a vertical lightning strike. After learning that smuggled plutonium to power the weapon the killed inspector is missing, Gregson brings in Agent Kohler of the National Nuclear Security Administration. With Kohler's team, Gregson is present as a bunker with the body of a man who may have built a dirty bomb with the plutonium is found. Later, Gregson calls Holmes, Bell and Watson to the bullpen as Kohler reports that an unidentified woman has called in a credible tip that a mosque will be bombed and a taxi is being used to transport the bomb. After watching traffic camera footage, Holmes tell Gregson that the bomb is conventional and there's no terrorist attack being planned, rather, it's a heist. Gregson leads a team to the building next to the mosque and blocks the robbers trying to leave the building. Threatening to detonate the bomb and poison the city, Gregson says they know the bomb isn't dirty but if detonated, they'll shoot. Realizing they are beaten, the thieves surrender. At a debriefing in Gregson's office, Kohler reports that the bomb was conventional, as Holmes deduced. They've found that the port the plutonium went through had an alarm triggered that Kohler cleared and, that his new girlfriend is related to one of the thieves. His girlfriend admitted to hooking Kohler up with the thieves, she's the one who called in the threat and, Kohler is arrested.
"Pushing Buttons": After Revolutionary war reenactor George Nix is killed at a reenactment, Gregson and Holmes examine the scene and question Brian, Kevin and an American reenactor, Chris Holland. They provide confused and contradictory statements, but Kevin says that he heard a .308 before George was shot. Later, Gregson is called to the scene of a fire at Nix's house. After Holmes and Watson restore burnt documents in a safe from Nix's home, they explain to Gregson and Bell that the documents were autographed by Button Gwinnett. A signer of the Declaration of Independence, his signature is worth nearly a million dollars due to its rarity. They believe that another collector destroyed the documents to increase the value of his Gwinnett signatures. When Holland is found to be the murderer and threw the murder weapon in a portable toilet, Gregson informs him that police will be searching the toilets and when the weapon is found, he'll be charged with murder. He encourages Holland to confess to avoid a very hostile prosecution.
"Our Time Is Up": Gregson attends the scene of the murder of Watson's former therapist, Dr. Candace Reed.
"Bits and Pieces": After Holmes can't remember how he acquired a human head, he tells Gregson about his PCS. Angry that Holmes didn't tell him about the PCS earlier, Gregson suspends Holmes from working with the NYPD until cleared by a department doctor. The head is traced to an organ bank whose president, Dominic Voth, admits to Gregson and Bell that his business may have not acted in accordance with DOH procedures and that they burned the body the head belonged to, that of Eric Russo. After Bell finds that Voth bought Russo's body from a body broker who forged Russo's donor consent forms, the broker, Walter Petty, is brought to the precinct where he informs Bell and Gregson that he has deals with funeral homes and crematoriums for bodies. He was in Cancun when Ludlow and Garvey were murdered and since he keeps no records of his transactions, he provides a list of all the locations he buys bodies from. Gregson calls Holmes to the precinct to inform him that he passed the department doctor's tests and has been reinstated with provisions. Gregson warns Holmes that if he doesn't follow the provisions exactly, it'll be the end of him working with the NYPD. Holmes tries to assure Gregson that he can be trusted but Gregson wants Holmes to prove it with his actions.
"Give Me the Finger": Gregson's daughter Hannah tells him that she's going through recovery for alcoholism. Watson meets Gregson in his office where he tells her that Hannah is an alcoholic going through AA. He asks Watson's advice on how best to help Hannah. After Holmes and Watson break into a building that a murdered man, Ando Azuma was last seen at, they are confronted by Air Force security and arrested. In the morning, Gregson is able to free them and they are met at the precinct by Lt. Colonel Robin Deakins and Major Beckam. Holmes deduces that the compound is a nuclear missile command centre. Later in Gregson's office, they share information on Azuma and learn he was hired by the Air Force to test security of a new nuclear missile control system. An officer who didn't want to new system implemented, General Alvero, is questioned where he shares with Gregson, Holmes and Watson embarrassing photos that gives him an alibi for when Azuma was killed. Later, Holmes gives him advice on Hannah's condition that he needs to move past blame and make her recovery about her. When Holmes discovers one of the Air Force officers killed Azuma, a group of officers are brought to the precinct and shown the motive. Gregson indicates that a recipe for making US currency stock is on old floppy disks sold to the Air Force and that Azuma was killed in order to stall the implementation of the new system in order to find the disks.
"Sober Companions": After Hannah's roommate Maddie is strangled, Gregson is at the scene and comforts Hannah who can't think of any suspects. Later at the precinct, Gregson and Holmes brief a task force on ten women preyed upon by the killer and confirm that the items on Maddie belonged to them. Bell finds that one of the items on Maddie belonged to Ashley Jenkins, who was found strangled in her home like Maddie. However, Ashley's husband Graham, was convicted of the murder though he swore that he saw a man fleeing his house. Gregson and Holmes visit Graham in prison where he confirms that Maddie was killed much like his wife was. He says the man that fled was tall and white and, when shown a bracelet that was on Maddie, confirms it was Ashley's. Graham also says that the killer wrote him a letter several years before apologizing for his incarceration. Gregson promises to get evidence of Graham's innocence. Holmes and Watson show Gregson evidence that the killer is Michael Rowan and when Gregson looks at Rowan's file and sees what car he drives, he earnestly says they need to talk to Hannah. Hannah comes to the precinct and confirms Rowan was the man who hit her car, they exchanged information and he asked her out. She was going on the date when Maddie was killed. Despite this, Gregson doesn't believe he can get a warrant to look into Rowan. Holmes and Watson locate the area where Rowan buried a victim and Gregson, Bell and a police team with dogs search the woods behind a construction site and quickly find a body, which turns out to be a wooden dummy. Later at the precinct, they view the dummy which has revealed no evidence. A judge has denied Gregson's request for a warrant to surveil Rowan but, he was able to have Graham Jenkins released from prison.
"Sand Trap": Holmes and Watson investigate the murder of a woman who has created a device that cleans water. With Gay's help, they discover that a bridge near her testing site is in danger of collapse. In Gregson's office, Gay shows Gregson and Bell a computer model that explains why the bridge will collapse. After an engineer who writes construction permit reports is found dead from five drill holes to the head, in the Morgue, Holmes explains why an Indian mobster, whose murder M.O. matches the dead engineer's, is being framed. A corrupt County Building supervisor is brought to the precinct where Gregson serves him with a warrant to search his car which, with other evidence, results in his arrest.
"Nobody Lives Forever": At the scene of a poisoned college professor, Noah Fogel, who was then eaten by rats, Fogel's assistant, Maya, explains to Holmes and Gregson that he was studying the effects of pesticides on small mammals. Gregson is part of the team that questions Fogel's drug dealer. After Fogel's research partner, Elijah Robinson is found murdered, a taco restaurant employee, Hugo, is questioned by Bell and Gregson. He's glad they are dead but has an alibi during their murders. At the precinct, Holmes and Watson explain to Gregson and Bell why the son of philanthropist Dudley Becket, who offered a $5M prize that Fogel and Robinson were close to winning, is the murderer. The son, Hunter, is later arrested.
"The Adventures of Ersatz Sobekneferu": After a woman, Mischa Farrell, is found being turned into an Egyptian mummy, Gregson introduces Bell, Holmes and Watson to Merrick Hausmann, an expert on Egyptian antiquities. Hausmann agrees with Sherlock that she was being forged as a mummy with the intent of being sold as a female pharaoh named Sobekneferu. After Bell arrests the man responsible for killing Farrell, he and Gregson easily get information from him. Discovering that Farrell was trying to expose an art forger, "Van Faux", Bell and Gregson confront Jasper Wells at his studio and learn that Farrell was his daughter. Wells co-operates with their investigation and briefs Gregson and others on "The Theban", who he believes is behind the mummification and other forgeries.
"You've Come a Long Way, Baby": As Bell and a CSU team are about to break up a cigarette smuggling operation, Gregson calls and cancels the operation as he's about to expose an ATF operation. Two ATF agents, Bakshi and Evaneer, explain their undercover operation at a cigarette company at the precinct where Gregson indicates that the head of the company is being questioned. After the two agents kill each other and money from the operation is transferred out of an account, Bell tells Gregson that the transfer was made by someone other than the ATF agents. Past transfers are identified by Gregson as going to ATF field offices and and suggests that the agents were being ripped off by their own. Gregson is involved in questioning an ATF agent who was requesting the slush fund money for the field offices. Watson deduces who was actually making the funding transfers and committed a murder, the cigarette company president's office manager. Gregson is able to convince the president of another cigarette company to give up the office manager.
"Meet Your Maker": After Holmes and Watson find a suspect in the disappearance of Maria Rodriguez, Bell and Gregson arrest Kyle Spikowski who has weapons in his car trunk which he planned to use to shoot women at a gym. After Bell, Holmes and Watson discover that Maria's boyfriend, a blacksmith, was being forced to make pistols, they show Gregson the evidence. Since both are missing, they believe that a gang abducted them and are forcing them to teach others to make the pistols, after which, they'll be killed. Gregson indicates that ATF has been looking for the source of pistols and though they've made many arrests of those that have used the pistols, none of those arrested would reveal the seller. When the seller is found but is killed by Suffolk County police, Bell brings Gregson to look at the scene. After learning that Bell plans to turn down a chance to join the US Marshals out of loyalty to Gregson, Gregson tells him he'd be very proud if Bell joined the Marshals.
"Breathe": After Leland Frisk, a relocation agent, is found to be a contract killer, Holmes and Watson show Gregson a number of Frisk's files that link him to suspicious deaths. Holmes also explains an unusual weapon called the "Incubus" used to suffocate victims. An FBI agent, Kerner, who was working on two of the murders seen in Frick's files, reviews the files with Watson and Gregson. Later in Gregson's office, Gregson is shown a restaurant security video in which a waitress buses Cal Medina's (whose prints were found at Frisk's murder scene) wine glass which is then taken by Frisk. Bell has confirmed it is the same glass found in Frisk's office leading them to believe that Frisk poisoned himself and framed Medina. Medina meets Gregson and Bell at the precinct where Gregson apologizes for accusing him of hiring Frisk. Gregson also says they almost got Medina killed and takes him to the viewing window of "the box." Explaining that they used informants and the Dark Web to leak that Medina was cutting a deal with law enforcement, the man in the box, Tad Linsky, started to surveil Medina. Linsky was arrested and a weapon linked to five murders found on him. He admitted that Medina hired him to kill the researcher Romano. Medina is turned over to FBI custody.
"Through the Fog": At the precinct, Gregson and Bell arrest Jeff Stanton for the murder of Alexis Garland. Bell finds a bag that begins smoking and putting it in "the box" and locking himself in the viewing room, Gregson locks down the precinct, calls the CDC and he checks on Bell. Bell reports the bomb was triggered by a cell phone and believes whoever set it off is still on the floor. Gregson that the Leon Cartel made an anthrax attack on a Mexican police station and confirms that Major Cases has hit the cartel hard. Holmes offers to contact the cartel for information which Gregson forbids however, Holmes ignores him. The CDC staff arrive led by Bridget Tanaka who indicates they'll be able to decon and release Bell shortly as the attack wasn't chemical. Mentioning the anthrax attack in Mexico, Gregson asks for the cell phone used to trigger the bomb to be processed and given to him quickly. He also tells her that the bomber is likely on the floor with them. With Bell released from quarantine, he and Gregson look at the phone used as the trigger and find photos of the precinct on it. Gregson tells Holmes they are going to question civilians on the floor and sends Holmes the photos from the cell phone. Bell and Gregson separately question five civilians who all appear innocent including a high school teacher on crutches, Anthony Daniels. Tanaka shows Bell and Gregson that the bomb was brought into the precinct in pieces and assembled just before it was detonated. Finding a precinct officer is involved in the bomb, Gregson and Bell question Sgt. Sean O'Grady. Gregson finds the precinct's servers were taken by someone in a CDC suit and realizes the bomb was a fake and a cover for their theft. Tanaka and her staff are questioned in Gregson's office but have alibis. Two civilians are found to be in on the theft with O'Grady and their plan is detailed. O'Grady was assured that no one would be hurt by the bomb but Gregson points out that the information on the servers could be used to hurt undercover officers and informants.
"How to Get a Head": A professor of religion, Gabriel Rojas, is beheaded and surrounded with occult items, a city councilman, Ledesma, meets with Gregson and others and indicates he was friends with Rojas who also consulted with the police on crimes involving the occult. Disagreeing with Holmes, he believes crimes that have occult signs are done by occult killers. Holmes sees Gregson and recommends Lena Romero, an officer from another precinct, for Bell's replacement. Gregson sees that Holmes is looking for someone who will work well with him and Watson as Holmes annoys many of the detectives at the 11th.
"Uncanny Valley of the Dolls": After an expert in 3D printing, Bruce Deramore, who also designed sex dolls, is murdered, Bell and Watson tell Gregson that they'll be looking into those that helped design a teleporting device that Deramore was a part of. In order to question Duramore's graduate studies supervisor, Dr, Ken Fukata, who was picked up by the US military, Gregson arranges with General Alvero to have Fukata brought to the precinct for questioning. After Fukata admits that he didn't give his grad students credit for helping to invent the teleporter, Bell and Watson look at threatening emails the students sent to Fukata and report to Gregson that none stand out as the murderer and that perhaps all three worked together. The case solved, Holmes plans to play a prank on Gregson using the sex doll, Skylar.
"The Worms Crawl in, the Worms Crawl Out": Gregson is involved in questioning the employer of a murdered worm expert, Dr. William Velnik, and a woman who emailed Velnik death threats in order to place a virus on his computer.
"The Visions of Norman P. Horowitz": After Holmes learns that a schizophrenic named Norman Horowitz has seemingly predicted three deaths and Holmes is the next predicted to die, a news channel reports on his predictions. Bell tells Gregson that the reporter received the tip anonymously which pointed her to Norman's list posted on a chat room by a new user, "WokeBaeBae." Bell is looking into the chat room's moderator. After Holmes realizes that Norman's brother David and his wife Luz are responsible for numerous murders to make the predictions comes true, he calls Gregson and asks for a police unit to be sent to the Horowitzes. Discovering that the Horowitzes are gone but left behind their passports, Holmes tells Gregson that they've been played for fools and were unwittingly involved in selling the hoax so that Henry Baskerville would buy "Visions." Two days later at the precinct, a police dragnet run by Bell and Gregson hasn't been able to find the Horowitzes.
"The Geek Interpreter": After Lily Zavala, a doctoral student of Harland Emple's is kidnapped and then escapes, Gregson, Holmes and Watson question her at the precinct. The kidnappers wore masks so she can't identify them but shows them that the math they forced her to work on was Emple's. Gregson watches as Lily explains the FEMA flood plain maps she was forced by her kidnapper to work on, the changes that her captor wanted made to the map and which properties would benefit from the changes. After Bell lures to the precinct a property owner, Marvin Hathaway, whose land would be negatively affected by the new map, Gregson, Bell and Watson recount Hathaway's plan. Bell indicates that hairs that match Lily's have been found in the basement of one of his properties. Hathaway denies being involved in the kidnapping and claims that another man, Cantrell, was responsible. Bell says that a fresh stain from an energy drink that was Lily's favorite was also discovered at the site. Spilled after Cantrell was murdered, Gregson asks Hathaway if he'd like to take his chances with a jury.
"Fit to be Tied": Gregson is at the scene of Rachel Garner, murder victim of Michael Rowan. He deals with FBI Agent Kim Mallick who wrongly accuses Gregson of not informing her of the murder. He later argues with Mallick in his office. When Rowan turns himself in, Gregson informs Holmes that Rowan will only speak to him. Gregson notes that he's tried to get a warrant to bug Rowan's home but the judge wouldn't allow it. Holmes anonymously tips the police off to Rowan's Albany residence so Gregson sees Judge Marilyn Whitfield for a search and surveillance warrant. Having denied his previous attempt, Gregson has to do a lot of convincing before Whitfield grants a search only warrant. Gregson suggests they visit Garner's workplace. Holmes finds that Garner's desk drawer was broken into and Gregson sees that a partner in the company she works for is the husband of Judge Whitfield. Holmes and Gregson confront Whitfield whose husband admits that he was having an affair with Garner and, the pool at Whitfield's home uses Baquacil. Gregson appeals to Whitfield to confess as the copycat murder of Garner will make it harder to prosecute Rowan and bring justice to his victim's families. After Rowan attacks Watson, at a hospital, Gregson arrives and says that Rowan evaded the FBI by disappearing into a crowd in Times Square before going to the Brownstone. Police haven't been able to find him and Gregson assigns two officers to protect Watson who Holmes says will be going to her parent's house. The next day at the precinct, Gregson and Bell are co-ordinating the manhunt for Rowan without any success. Bell suggests having police call airports and bus lines as Rowan has probably escaped the city. Gregson receives a call from Agent Mallick that they've found Rowan. As Holmes scrubs Rowan's blood from the Brownstone stairs, Gregson calls to report that Rowan is dead. Beaten to death, his body was dumped in a garbage transfer station.
"Whatever Remains, However Improbable": With Watson as the prime suspect in Rowan's murder, Holmes surprises Gregson at his home and asks for help which Gregson can't give as he's being too closely watched by the FBI. After Holmes and Watson discover that Gregson erased security video at a garbage transfer station used to transport Rowan's body, Holmes confronts Gregson who confirms he didn't keep a copy of the garage video. Holmes has deduced Rowan's killer was Gregson's daughter Hannah whose roommate, Maddy, Rowan murdered. Gregson relates that after Maddy's murder, Hannah got to know every aspect of Rowan's life. After he was wounded attacking Watson, Hannah knew Rowan would go to Mulgrew's house which is where she beat him to death. Hannah didn't hear Rowan say "Joan" and didn't know his killing was being recorded. Gregson helped Hannah before Mallick pinned the murder on Watson. He believes there isn't enough evidence for Mallick to arrest Watson and appeals to Holmes to let the matter lie. When Holmes points out the damage Mallick's allegations will have on Watson's life, Gregson, ashamed and angry, blames Hannah's actions on Holmes, whose life Rowan targeted with his serial killing. Gregson can't let Hannah, a cop, go to prison but Holmes says Watson is his best friend and leaves.

Season 7[]

He loves you. I mean, he can't say it right now. Hell, he probably couldn't say it even if he was awake, but he does.

— Paige to Holmes, "Gutshot"
S07E02-Gregson hospital long

Thomas Gregson Season Seven/Gallery

Detective Bell encourages Gregson to apologize to Holmes and Watson and then learns Gregson has been shot. Holmes secretly returns to NYC and with Watson, discovers that Patrick Meers shot Gregson. Holmes secretly visits a comatose Gregson in hospital and is discovered by Paige. Gregson wakes and begins his recovery. He tells Watson that Meers lied to her about the sequence of events that led to his shooting. After Gregson's temporary replacement, Captain Dwyer, harasses one of his detectives, Bree Novacek, Gregson encourages her to report him. Gregson is involved in a case brought to Holmes and Watson by Cassie. Reappearance of a dormant serial killer and a stolen dog results in Gregson calling Holmes and Watson into the case.

Appearances in Season 7
"The Further Adventures": In "the box" at the 11th Precinct, Detective Bell shows a man, Tony, evidence that he killed his wife while Gregson watches. In the bullpen, a smiling Gregson congratulates Bell, who is leaving to be a U.S. Marshal. Bell opens a box which contains a Stetson hat and when Gregson learns it's from Holmes and Watson, his smile vanishes. In Gregson's office, Bell tells the Captain that he knows that he's covering for someone in the murder of Michael Rowan but will keep it secret. Insisting that Gregson needs to make things right with Holmes and Watson, he encourages Gregson to apologize to them. In the elevator at the 11th Precinct, Gregson thanks Bell for his encouragement and says he's going to call Holmes and Watson to apologize. Bell calls Holmes and Watson and tells them that Gregson has been shot. Found on the street, there were no witnesses to the shooting and Gregson's prognosis isn't good.
"Gutshot": Two young men, Arnold and Tremaine, are spraying graffiti on a wall and hear a car crash. They find a man lying on the pavement. Arnold leaves, but despite risking arrest for the graffiti, Tremaine calls 911 after noticing gunshot wounds on the man, who is Captain Gregson. Watson arrives from London and joins Bell in the case to find Gregson's shooter. At the hospital, Paige Cowan is now confined to a wheelchair due to the progression of MS. Saying Gregson called her when he left the precinct, as he does every night, she has no suspects and no indication where Gregson stopped at after he left the precinct. At the hospital, having snuck by the guard, Holmes tells a comatose Gregson that he forgives him. Paige interrupts and tells Holmes that she doesn't know what happened between them but that Gregson loved and missed him. Gregson questioned everyone involved in the bar's construction and at Patrick Meers' office, noticed a plaqued picture of the opening of a baseball field snack bar, where Tim Bledsoe's body was discovered. Seeing the date on the picture coincided with the week Tim went missing, Meers followed Gregson after he left his office to the baseball field where they exchanged gunfire.
"The Price of Admission": Captain Gregson does not appear in this episode.
"Red Light, Green Light": Having awoken, Holmes forgives Gregson and they put their differences in the past. Watson meets Gregson at the hospital where he tells her that Patrick Meers lied to her about the sequence of events that led to his shooting. He questioned Patrick the day before he was shot, not just before. They both wonder why Patrick would lie about this. Watson tells Holmes about Patrick Meers' lie and that a location app on his phone placed him a home just before Gregson was shot. At the hospital, Watson tells Gregson that all evidence of "ROOKR3D" have been erased from the game server. She believes Patrick knew about the ferry bombing plot but doesn't think he was involved.
"Into the Woods": Captain Gregson does not appear in this episode.
"Command:Delete": Captain Gregson does not appear in this episode.
"From Russia with Drugs": In the bullpen at the 11th Precinct, Gregson's temporary replacement, Captain Dwyer, welcomes Gregson back to duty in front of his command and gives him a large novelty police shield. After a top detective, Bree Novacek, tells Gregson she's leaving the NYPD, Gregson suspects Dwyer sexually harassed her as he's on probation for a past incident. Surprising Dwyer at a bar, Gregson asks him about Novacek while indicating that she never implicated Dwyer. Dwyer is furious and while not admitting to any misconduct, believes Gregson should be thankful for the work he did at the 11th. Novacek later tells Gregson that Dwyer did harass her and while she's still leaving the NYPD, she reported his misconduct to the EEO.
"Miss Understood": After Cassie asks for Holmes and Watson's help finding the killer of Heather Foley, Bell tells Watson that Heather was shot with a 9mm pistol and he's reached out to detectives in NJ who were assigned the case. At NJ State Police HQ, Detective Calabrissi and Detective Farrad introduce Captain Gregson, Bell and Watson to undercover Detective Ocasio. Using an evidence wall, Calabrissi explains the "baby formula mafia" who are mainly supplied by shoplifters. Heather was setting up a meeting between Ocasio and Sagehorn in which Ocasio would record Sagehorn acknowledging she was buying stolen formula. After Detective Calabrissi is taken into custody, Watson explains to Bell and Gregson that he was Mack's fixer and provided details on the formula investigation to Mack. Found in possession of an unregistered 9mm pistol which Bell believes will match that used to kill Heather, he also indicates that Calabrissi has offered to give Mack up. Given Cassie's role in solving the case, all three wonder about her future.
"On the Scent": Called to the precinct by Gregson, Holmes and Watson are told of the murder of Caroline Gibbs. DNA was found at the scene on a scrap of a shirt which police believe one of Gibbs' dogs tore off the killer. The DNA matches the "Ghost of Brooklyn", a serial killer who hasn't struck in ten years. Later, Bell and Holmes tell Gregson they've found the "Ghost." They explain that a Mr. Wu works for the company that makes the DNA kits for the police. He has a condition in which he sweats excessively, which contaminated the kits. Promoted to manager ten years previously, he wasn't in contact with the kits until recently when he filled in for a sick worker. Later, having found the killers in the past cases blamed on the "Ghost", Gregson is told that a shirt scrap found at Gibbs' murder scene didn't have any DNA on it. Gregson and Watson question Gibbs' neighbor, Benjamin Long, who denies having an affair with Gibbs and provides an alibi. He indicates that the entire neighborhood was unhappy with Gibbs, due to her barking dogs and that she was suspected of dealing drugs.
"The Latest Model":


Cheryl Gregson[]

011 An Unnatural Arrangement episode still of Cheryl and Tommy Gregson

"I'm not living here at the moment."

After a break-in in his house, where his wife Cheryl shoots an armed intruder who demands Tommy's whereabouts, he reveals that he and Cheryl are on a trial separation. Cheryl is tired of Tommy's job being prioritized over her, but Tommy thinks the trial separation is just a break for Cheryl and that she'll come back. During the investigation, Tommy learns that Cheryl has dated a man that Tommy hates. After realizing why his wife wanted the separation, he lets her know that she deserves better and that he is going to use the separation to figure out how to give it to her.[3] When Holmes returns from London, he deduces that Tommy and Cheryl have broken up for good.[5]

Paige Cowan[]

S04E15-Gregson introduces Paige

"She's a doctor."

Gregson's new girlfriend, Paige Cowan, is a former police officer who was forced to resign. When Watson runs into them at a restaurant, she inadvertently triggers their break-up as Paige wanted to keep their relationship a secret from Gregson's work colleagues. It is later revealed that the larger reason Paige broke things off was because she was recently diagnosed with Multiple Sclerosis. Gregson wants to be with Paige, even with her health issues and he convinces Paige to resume their relationship.[6]

S05E03-Gregson proposes to Paige

Gregson proposes.

As a favor to Gregson's girlfriend Paige, Sherlock investigates her doctor's staff, and finds evidence of wrong doing. However, in doing so he uncovers that Paige is having financial difficulties. Sherlock suggests that Gregson marry Paige so that she may be covered under his insurance, Gregson admits that he loves Paige and wants to marry her, but she isn't keen to do so. Sherlock arranges a meeting between Gregson and Paige after speaking to her about marriage. Apparently Sherlock managed to lower her defenses and then told Gregson they should get married because Gregson said he wanted it. Sherlock even provided a selection of rings.[7]



I get how big a decision this is, so if you decide to tell them no, I'll understand. But if you decide to see this thing through, I just want you to know that I'd be so proud of you.

— Gregson to Bell on applying to be a US Marshal, "Meet Your Maker"

I wanted you know I appreciate everything you did for me. You're the best boss I ever had.


  1. Season 3, episode 23: "Absconded"
  2. Season 1, episode 1: "Pilot"
  3. 3.0 3.1 Season 2, episode 6: "An Unnatural Arrangement"
  4. Season 3, episode 5: "Rip Off"
  5. Season 3, episode 1: "Enough Nemesis To Go Around"
  6. Season 4, episode 15: "Up to Heaven and Down to Hell"
  7. Season 5, episode 3: "Render, and Then Seize Her"
  8. Season 3, episode 8: "End of Watch"
  9. Season 7, episode 7: "From Russia with Drugs"