Lee Patterson as Sam Lowry

Eddie Byrne as Inspector O'Neill

Betty McDowall as Anne Ford

Ewen Solon as Sir David Rogers

John Le Mesurier as Dr. Tranter

George Rose as Clarke

Philip Leaver as Music Hall Manager / O'Reilly

Barbara Burke as Kitty Knowles

Anne Sharp as Helen Morris

Denis Shaw as Simes

Endre Muller as Louis Benz

Esma Cannon as Nelly

George Woodbridge as Blake

Bill Shine as Lord Tom Sopwith

Marianne Stone as Drunken Woman

Garard Green as Dr. Urquhart

Dorinda Stevens as Margaret / Maggie

John Barrett as Onlooker at 2nd Murder Scene

Patricia Phoenix as Rowdy Woman in the Crowd

Jennifer White as Beth