TV series
In crowded and expensive London, cash-strapped couple Gemma and Kieran open their small apartment to a third person. Somehow, their new addition, Ray, makes the flat seem bigger, not smaller. Gradually, many things become easier, nicer and better with an extra pair of hands.
Availability
Trigonometry premiered March 15, 2020. We don't have a confirmed streaming, rental or purchase option yet.
In crowded and expensive London, cash-strapped couple Gemma and Kieran open their small apartment to a third person. Somehow, their new addition, Ray, makes the flat seem bigger, not smaller. Gradually, many things become easier, nicer and better with an extra pair of hands.
Choose an episode, then use the watch options above for the show.
Episode 1
In London, cafe owner Gemma and her paramedic boyfriend Kieran are barely making ends meet. Their new lodger Ray initiates an adventure nobody expected.
Directed by Athina Rachel TsangariWritten by Effie Woods, Duncan Macmillan
Episode 2
Everyone is confused after their shared moment the night before. At work, Gemma gets a visit from her dad, Ray has a panic attack, and something goes wrong on Kieran’s shift.
Directed by Athina Rachel TsangariGuest stars Maja Laskowska, Fionn Walton
Episode 3
In the months before the wedding, Ray, Gemma and Kieran’s lives intertwine in new and unexpected ways.
Directed by Athina Rachel TsangariGuest stars Maja Laskowska, Badria Timimi, Fionn Walton
Episode 4
Following Ray’s declaration the night before, Gemma and Kieran go ahead with their wedding day. Will the tension between the three come to a head in front of friends and family?
Directed by Athina Rachel TsangariGuest stars Llewella Gideon
Episode 5
The day after the wedding. Gemma and Kieran are due to go on their romantic honeymoon in Finland and Ray starts a new job.
Directed by Athina Rachel Tsangari
Episode 6
Ray’s mum, Mathilde, visits London for Ray’s birthday. It’s been a year since Ray left home and Mathilde tries to navigate the distance growing between her and her only child. Over a tense birthday dinner, Mathilde observes a new dynamic between Ray and her landlords.
Directed by Stella Corradi
Episode 7
The café is under threat and Ray thinks she has the solution, but Gemma and Kieran aren’t sure. The triad come out to their friends and family, sparking some surprising reactions.
Where to watch Trigonometry
Episode 8
The triad have never been happier, but a family tragedy throws everything up in the air. Gemma faces a possibility that she never dreamed of, and Ray makes a decision.
Where to watch TrigonometryEpisode information updated Jul 24, 2026
Available now in United States
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Ariane LabedRay
Thalissa TeixeiraGemma
Gary CarrKieran
Isabella LaughlandMoira
Ambreen RaziaNaima
Anne ConsignyMathilde
Rebecca HumphriesCaroline
Elliot MorrisChild
BBC TwoUnited Kingdom
House ProductionsUnited Kingdom
BBC StudiosUnited Kingdom
