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)
Henry Kulky
McCrossin (uncredited)
Peter Ortiz
Crewman (uncredited)
Ray Stevens
Crewman (uncredited)
John Wengraf
Col. Schuman (uncredited)
Ben Wright
BBC Announcer (uncredited)
