Sophie Leigh Stone

Sophie Leigh Stone (born ) is an English stage and television actress. She was the first deaf student to win a place at the British drama school Royal Academy of Dramatic Art (RADA). She is best known for her roles as Louise in Two Doors Down and as Cass in Doctor Who. In 2022, she joined the cast of the new Acorn TV detective series The Chelsea Detective, playing the forensics officer Ashley Wilton. She continued to play that role in season 4 in 2026.

Early life and education Sophie Leigh Stone to Ruth Bullock, a painter, and guitarist Martin Stone. She has been deaf since birth, and grew up in East London. She attended Mary Hare Grammar School for the Deaf.

Stone took up a place at RADA after the birth of her two children (to whom she is a single mother), and worked with other theatre companies.

In Spring 2014, she played Agnetha in Bryony Lavery's play Frozen, opening at the Birmingham Repertory Theatre.

In Autumn 2014, she took the leading role in the touring production of Woman of Flowers, a reworking of the Welsh myth of Blodeuwedd by playwright Kaite O'Reilly.

She has also appeared in episodes of several British television series and short films.

In 2015, she played the role of deaf crew-leader Cass in the Doctor Who episodes "Under the Lake" and "Before the Flood", who communicated entirely in British Sign Language. She was cast as Princess Alice of Battenberg, Prince Philip's mother, who was deaf herself, in Series 2 of Netflix historical drama The Crown. In 2021 she played the lead in an episode of the BBC 1 anthology series Jimmy McGovern's Moving On.

In 2009, she played in Coming Home, directed by the deaf director Louis Neethling. She played the deaf poet and activist Dorothy Miles in the docu-drama "Dot" in 2019.

She appeared with actress Vilma Jackson in the short Sign Night, which was broadcast on the BBC.

In 2020, she added radio to her credits, by being cast in a BBC Radio 3 drama Beethoven Can Hear You as a deaf traveller from the future that visits Beethoven (played by Peter Capaldi). She also wrote and spoke an essay about her relationship with music. This was part of the celebration for the 250th anniversary of Beethoven's birth.

In 2013, she co-founded the DH Ensemble Theatre Company, which creates plays that include deaf and hearing actors. She is also an associate artist for the Watermill Theatre, and in 2021 she guest-edited an anthology of Deaf authors for Arachne Press.

In 2022, she joined the cast of the new Acorn TV program, The Chelsea Detective. She played the forensics officer Ashley Wilton, a role she continued to play in the third series of the show, in 2025.

Credits Film

Television

Theatre