Marlon Brando
Robert Crain
Yul Brynner
Captain Müller
Janet Margolin
Esther
Trevor Howard
Colonel Statter
Martin Benrath
Kruse
Hans Christian Blech
Donkeyman
Wally Cox
Dr. Ambach
Max Haufler
Branner
Rainer Penkert
Milkereit
William Redfield
Baldwin
Oscar Beregi Jr.
Admiral (as Oscar Beregi)
Martin Brandt
Nissen
Charles De Vries
Kurz
Carl Esmond
Busch
Martin Kosleck
Wilke
Norbert Schiller
Steward
Rick Traeger
Schultz
Ivan Triesault
Lt. Brandt
Robert Sorrells
Koeniger
Eric Braeden
Radio Officer (uncredited)
Frank London
Merchant Marine (uncredited)
Jim Goodwin
Merchant Marine (uncredited)
Gregg Barton
Merchant Marine (uncredited)
Paul Baxley
Crew Member (uncredited)
Hal Bokar
Merchant Marine (uncredited)
Heinz Brinkmann
Crew Member (uncredited)
Gene Dynarski
Merchant Marine (uncredited)
Harold Dyrenforth
Cornelson, Ingo Navigator (uncredited)
Horst Ebersberg
Crew Member (uncredited)
Fritz Ford
Crew Member (uncredited)
Harold Goodwin
Merchant Marine (uncredited)
Sam Javis
Merchant Marine (uncredited)
Roy Jenson
Merchant Marine (uncredited)
Buck Kartalian
Merchant Marine (uncredited)
Robert Kino
Capt. Hatsuma (uncredited)
Manfred Lating
Lutz (uncredited)