S04E09-Fiona head shot

Fiona Helbron Elementary intertitle Programmer

Character Information
Status: Alive
Actor: Betty Gilpin
First Appearance: "Murder Ex Machina"
Last Appearance: "Ill Tidings"
Nicknames: Mittens
Episode Count: 4
They say autism is a spectrum, but it's really an array of different conditions all lumped together.
— Fiona, "Murder Ex Machina".

Fiona Helbron is the lead computer programmer for Pentillion Edge. She dates Sherlock Holmes, is autistic or "nueroatypical" and likes cats.


Season Four

Joan Watson and Sherlock question Fiona and her boss Phil Balsam after discovering that her code for operating a driverless car was used to kill two Ukrainian hitmen. They discover that the code was stolen and Fiona is incapable of lying. Sherlock later suspects her boss of being behind a drive-by killing purpetrated by the hitmen and with Fiona's help, Balsam's car is overtaken by Fiona and Holmes is able to get a confession from him. ("Murder Ex Machina")

S04E09-Fiona at work
I like it when the code works.

Fiona asks for Watson's help assessing her new boss. Later, when Watson delivers her report to Fiona she gives Watson a book that Sherlock lent her and Watson realizes that he likes Fiona. Watson teases Sherlock about this which makes him uncomfortable. Fiona visits The Brownstone with thank you gifts for Watson but really wants to see Sherlock. They go on the roof and she declares her interest in Sherlock which genuinely astonishes him. His phone rings which interrupts the moment. Later, Sherlock visits Fiona at her apartment where she tells him she's had boyfriends before but they said she's a lot of work. Sherlock asks if can kiss her but she's scared and asks him out for coffee. ("A View with a Room")

S04E12-Fiona flowers Holmes
We talked and I liked it.

S04E12-Fiona Sherlock apartment
I'm a little afraid.

Fiona drops by the Brownstone unexpectedly when Sherlock isn't there. She tells Watson she has prepared something to say to him and will come back later. Sherlock tells Watson he and Fiona haven't had sex and he's trying hard to be respectful. When Fiona talks to Sherlock, she says that she feels that he's being too careful and views her as a problem to be solved and she's breaking up with him. Later, Sherlock convinces Fiona to come back to the Brownstone and explains to her that the extra effort he's been making is because he is different and he tells her about his one past relationship. Impressed, Fiona says she wants have sex with Sherlock. ("Ready or Not")

S04E18-Fiona Sherlock kiss
I think we should have sex now.

Season Five

Fiona and Sherlock talk via video chat as she's working in Philadelphia. He accepts her offer to meet for the weekend at a bad and breakfast in New Jersey. As Holmes talks to Bell and Watson about relationships, he realizes that he doesn't talk about his work to Fiona. Watson quotes from Shakespeare regarding how to break bad news. Later, before Sherlock takes a video chat with Fiona, he recites the quote implying that Sherlock broke up with Fiona. ("Ill Tidings")

S05E06-Fiona skype
I wasn't sure you'd say yes.
Elementary intertitle Elementary Characters
Main Characters
Sherlock HolmesJoan WatsonCaptain Thomas GregsonDetective Marcus Bell
Recurring Characters
AlistairAthena and MinervaGeneral AlveroHenry BaskervilleJonathan BloomRoy BookerAgent BurkeClydeGina CortesFrank Da SilvaDuaneEveryoneAgent GephardtDr. GrannisChristopher GrayDel GrunerDetective GuzmanHalconEmily HankinsDr. Eugene HawesFiona HelbronWilliam HullShinwell JohnsonEmil KurtzGareth LestradeAlfredo LlamosaAgent MallickMarchefElana MarchMargaretAgent McNallyMidnight RangerChantal MilnerAndrew MittalSanthosh MittalSebastian MoranJamie MoriartyAgent MullerIsaac ProctorRandyOscar RankinCandace ReedMichael RowanTim SherringtonTall BoyJoshua ViknerSir James WalterAgent WhitlockTyus WilcoxKitty Winter
The Irregulars
Mr. BriggsC.Harland EmpleGayMs. HudsonLucMasonThe NosePhil SimmsAgatha SpurrellTeddy
Andre BellPaige CowanHannah GregsonMay HolmesMorland HolmesMycroft HolmesEstella LlamosaHenry WatsonMary WatsonOren WatsonLin Wen
Minor Characters
The ActuaryJack BrunelleLucas BundschCassieWade CrewesKathryn DrummondHoward EnnisMistress FeliciaZoya HashemiRhys KinlanRuslan KrasnovGwen and Olivia LynchNigella MasonTy MorstanPamRemusRomulusJennifer SaylesShauna ScottHeather Vanowen