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
Frederick Cooper
Briggs
Jean Shepeard
Mrs. Briggs
Barry Morse
Robert
George Carney
Harry
Miles Malleson
Chairman of Directors
Bryan Herbert
Flanning
James Pirrie
New Pilot
A.E. Matthews
Mr. Kirby
Olive Sloane
Woman Director
Tommy Duggan
Office Clerk
Tony Quinn
Office Clerk
Harold Anstruther
British Consul
Alfred Sangster
Director
Gerard Heinz
Dr. Hartmann (uncredited)
Vi Kaley
Old Woman in Cell (uncredited)
David Keir
1st Magistrate (uncredited)
Andreas Malandrinos
Italian Police Chief (uncredited)
Arnold Marlé
President of the Medical Society (uncredited)
Bernard Rebel
Italian Passenger (uncredited)
Victor Rietti
Doctor (uncredited)
Raymond Rollett
1st Judge (uncredited)
Milo Sperber
Mr. Hirohiti (uncredited)