Michael Redgrave
David Charleston
Barbara Mullen
Ellen Kirby
James Mason
Streeter
Lilli Palmer
Melanie Kurtz
Finlay Currie
Capt. Joshua Stuart
Frederick Valk
Dr. Kurtz
Sybille Binder
Anne Marie
Barry Morse
Robert
George Carney
Harry
Miles Malleson
Chairman of Directors
Bryan Herbert
Flanning
A.E. Matthews
Mr. Kirby
Olive Sloane
Woman Director
Tommy Duggan
Office Clerk
Gerard Heinz
Dr. Hartmann (uncredited)
Arnold Marlé
President of the Medical Society (uncredited)
Victor Rietti
Doctor (uncredited)
Milo Sperber
Mr. Hirohiti (uncredited)
Frederick Cooper
Briggs
Jean Shepeard
Mrs. Briggs
James Pirrie
New Pilot
Tony Quinn
Office Clerk
Harold Anstruther
British Consul
Alfred Sangster
Director
Vi Kaley
Old Woman in Cell (uncredited)
David Keir
1st Magistrate (uncredited)
Andreas Malandrinos
Italian Police Chief (uncredited)
Bernard Rebel
Italian Passenger (uncredited)
Raymond Rollett
1st Judge (uncredited)