Dennis Price

as Louis Mazzini / His Father

Alec Guinness

as The D'Ascoyne Family: The Duke / The Banker / The Parson / The General / The Admiral / Young Ascoyne / Young Henry / Lady Agatha

Joan Greenwood

as Sibella

Valerie Hobson

as Edith D'Ascoyne

Audrey Fildes

as Mama

Miles Malleson

as The Hangman

Clive Morton

as The Prison Governor

John Penrose

as Lionel Holland