William Hartnell as Leo Martin

Raymond Lovell as Gus Loman

Robert Beatty as Det. Insp. Rogers

Herbert Lom as Gregory Lang

Joyce Howard as Carol Dane

Alan Wheatley as Noel Penn

Cyril Smith as Det. Sgt. Charlie Weeks

Elsie Wagstaff as Mrs. Wilkins

Ian Fleming as Prison governor

Wally Patch as Joe Fisher

Ian McLean as Det. Mason

Harry Lane as Big Mike

Frederick Morant as Harry Millerton

Ivor Barnard as Jonah Crackle

John Rorke as Casson - The Butler

Ernest Butcher as John Brown

Kenneth Warrington as Winckle

Wilfrid Hyde-White as Cleaner

Albert Chevalier as Spearman - C.I.D.

Paul Croft as Dusty

Howard Douglas as Mr. Quilp

Alfred A. Harris as Doctor

James Robertson Justice as Prison Governor

Joe Cunningham as Chief Prison Officer

Anders Timberg as Jerry Winters

H Victor Weske as Hatchett

James Knight as Smokey

André Belhomme as Larry

Iris Hunter-Symon as Cashier

Percy Coyte as Hangman

Harry Terry as Mick

Jimmy Rhodes as Rusty

Armand Guinle as Van de Beek

Elizabeth London as Peggy