Richard Widmark

Capt. Adam Jones

Bella Darvi

Denise Montel

Victor Francen

Prof. Montel

Cameron Mitchell

'Ski' Brodski

Gene Evans

Chief Holter

David Wayne

Tugboat Walker

Stephen Bekassy

Neuman

Richard Loo

Hakada Fujimori

Robert Adler

Welles (uncredited)

Eugene Borden

French Reporter (uncredited)

Leslie Bradley

Mr. Aylesworth (uncredited)

John Wengraf

Col. Schuman (uncredited)

Harry Carter

Ben Wright

BBC Announcer (uncredited)

Ron Nyman

Lee Sockwell (uncredited)

Robert B. Williams

Reporter (uncredited)

Cactus Mack

Crewman (uncredited)