Philip Calvert
Anthony Hopkins
Uncle Arthur
Robert Morley
Capt. Imrie
Peter Arne
Quinn
Oliver MacGreevy
Durran
Jon Croft
Lord Kirkside
Tom Chatto
Sgt. Macdonald
Charlie Stewart
Macullum
Edward Burnham
Dungeon Guard
Del Henney
Thug (uncredited)
Bill Brandon
Thug on Boat (uncredited)
Harry Fielder
Martin Grace
Charlotte
Nathalie Delon
Sir Anthony Skouras (voice) (uncredited)
Charles Gray
Agent (uncredited)
Prentis Hancock
Seaman (uncredited)
Barrie Hesketh
Bill Hibbert
George Leech
Sir Anthony Skouras
Jack Hawkins
Hunslett
Corin Redgrave
Lord Charnley
Derek Bond
Lavorski
Ferdy Mayne
Lt. Williams - Helicopter Pilot
Maurice Roëves
Tim Hutchinson
Leon Collins
Sue Kirkside
Wendy Allnutt
Producer
Elliott Kastner
Director
Étienne Périer
Novel
Alistair MacLean
Screenplay
Compositor
Walter Stott
Director of Photography
Arthur Ibbetson
Associate Producer
Denis Holt
Editor
John Shirley
Costume Design
Sue Yelland
Production Supervisor
Ted Lloyd
Original Music Composer
Angela Morley
Art Direction
Jack Maxsted
Location Manager
Malcolm J. Christopher
Assistant Camera
David Wynn-Jones
Special Effects
Les Hillman