Ralph Fiennes

as Roald Dahl / Policeman

Benedict Cumberbatch

as Henry Sugar / Make-Up Artist

Dev Patel

as Dr. Chatterjee / John Winston

Ben Kingsley

as Imdad Khan / Croupier

Richard Ayoade

as Dr. Marshall / Yogi

Jarvis Cocker

as Canasta Player / Manor Guest / Friend of Henry Sugar / Casino Entrance Man

Rebecca Cornford

as Canasta Player / Manor Guest / Friend of Henry Sugar / Casino Guest / Hospital Nurse

David Gant

as Casino Croupier