David Tennant and Elisabeth Moss have begun work on their new film, Mad to be Normal.
The project is about psychiatrist RD Laing.
It was first announced back in May during the Cannes Film Festival.
The film tells the story of world-renowned Scottish psychiatrist Laing and his acolytes at Kingsley Hall, East London, during the 1960s.
Michael Gambon and Gabriel Byrne co-star with Robert Mullan directing.