Cliff Robertson
David Frazer
Jack Hawkins
Colonel Drexel
Marisa Mell
Sophie
Michel Piccoli
Georges Sarrassin
Bill Fraser
Leslie Dunwoody
Charles Gray
Benson
John Le Mesurier
Sir Robert
Felix Aylmer
Henrickson
Christopher Witty
Prince Jamil
Tutte Lemkow
Paviot
Ernest Clark
Minister
Keith Pyott
Gustave
Jose Burgos
El Mono
James Payne
Russian Officer in Tent (uncredited)
Jerold Wells
Brindle (uncredited)
George Roderick
Officer at Circus (uncredited)
Crew
Michael Relph
Producer
Beatrice Dawson
Costume Design
Victor Canning
Novel
Otto Heller
Director of Photography
John D. Guthridge
Editor
Donald M. Ashton
Production Design
Basil Dearden
Director
Jack Stevens
Art Direction
Philip Green
Original Music Composer
William Goldman
Screenplay
Michael Relph
Screenplay
Jack Rix
Production Supervisor
C.C. Stevens
Sound Recordist
Roy Baker
Sound Editor
Harry Frampton
Makeup Artist
Penny Daniels
Continuity
John Peverall
Assistant Director
Gordon K. McCallum
Sound Recordist
H. A. R. Thomson
Camera Operator
Frank Turner
Makeup Artist
Bill Griffiths
Hairdresser
Charles Blair
Location Manager