Leslie Banks

Taylor

Michael Redgrave

Russian

Will Hay

Skipper

John Mills

Tom

Bernard Miles

Royal Navy Mate

Michael Rennie

George

Frank Cellier

Schneider

Robert Morley

Von Geiselbrecht

Alfred Drayton

Direktor

Marius Goring

German Propaganda Officer

Austin Trevor

U-boat Captain

Albert Lieven

Gunter

Leif Konow

Dane

Charles Frend