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)