Col. Lewis Pugh
Gregory Peck
Capt. Gavin Stewart
Roger Moore
U-Boat First Officer
Dan van Husen
Captain of Ehrenfels
George Mikell
First Officer of Ehrenfels
Jürgen Andersen
Underhill
Bernard Archard
Mr. Montero
Martin Benson
Dennison
Percy Herbert
Hilliard
Donald Houston
Peters
Glyn Houston
Malvern
Terence Longdon
Dickie Melborne
Allan Cuthbertson
Col. W.H. Grice
David Niven
Mrs Doris Grice
Faith Brook
Finley
John Standing
Don Manners
Graham Stark
Maclean
Jack Watson
Breen
Moray Watson
Langley
Michael Medwin
'Patch' Lovecroft
William Morgan Sheppard
Barker
Patrick Holt
Sloane
Clifford Earl
Manuel
Keith Stevenson
Jack Cartwright
Trevor Howard
Butterworth
Brook Williams
Williamson
Victor Langley
Ram Das Gupta
Marc Zuber
Brothel Keeper
Mohan Agashe
Mrs. Cromwell
Barbara Kellerman
Major 'Yogi' Crossley
Patrick Macnee
Charlie Wilton
Kenneth Griffith
Colin Mackenzie
Patrick Allen
Trompeta
Wolf Kahler
U-Boat Captain
Robert Hoffmann
Editor
John Glen
Stunts
Eddie Powell
Writer
Reginald Rose
Director
Andrew V. McLaglen
Main Title Designer
Maurice Binder
James Leasor
Original Music Composer
Roy Budd