Gregory Peck

as Col. Lewis Pugh

Roger Moore

as Capt. Gavin Stewart

David Niven

as Col. W.H. Grice

Trevor Howard

as Jack Cartwright

Barbara Kellerman

as Mrs. Cromwell

Patrick Macnee

as Major 'Yogi' Crossley

Kenneth Griffith

as Charlie Wilton

Patrick Allen

as Colin Mackenzie

Wolf Kahler

as Trompeta

Robert Hoffmann

as U-Boat Captain

Dan van Husen

as U-Boat First Officer

George Mikell

as Captain of Ehrenfels

Jürgen Andersen

as First Officer of Ehrenfels

Bernard Archard

as Underhill

Martin Benson

as Mr. Montero

Percy Herbert

as Dennison

Donald Houston

as Hilliard

Glyn Houston

as Peters

Terence Longdon

as Malvern

Allan Cuthbertson

as Dickie Melborne

Faith Brook

as Mrs Doris Grice

John Standing

as Finley

Graham Stark

as Don Manners

Jack Watson

as Maclean

Moray Watson

as Breen

Michael Medwin

as Langley

William Morgan Sheppard

as 'Patch' Lovecroft

Patrick Holt

as Barker

Clifford Earl

as Sloane

Keith Stevenson

as Manuel

Brook Williams

as Butterworth

Victor Langley

as Williamson

Marc Zuber

as Ram Das Gupta

Mohan Agashe

as Brothel Keeper