Zachary Scott
— John Lewis Sullivan
Faith Domergue
— Barbara Peters
Peter Illing
— Carlo Raffone
Faith Brook
— Joan Lennox
John Welsh
— Inspector Hunt
Julian Strange
— Detective Sergeant
Gordon Jackson
— Jimmy Norris
Kay Callard
— Pamela Norris
Harold Siddons
— Colin Wells
John Horsley
— Alan Peters
Fabia Drake
— Sister Veronica
Roger Delgado
— Alberto (uncredited)