Philip Sutherland
Clark Gable
Marya Lamarkina
Gene Tierney
N.K.V.D. Man
Peter Illing
U.S. Ambassador
Robert Henderson
John Barnes
Stanley Maxted
Lemkov
Meinhart Maur
General Zhdanov
Alexis Chesnakov
Hotel Desk Clerk (uncredited)
Anton Diffring
Toasting Russian Officer (uncredited)
Martin Benson
Marya's Partner (uncredited)
Anton Dolin
Richard Marner
Russian Policeman (uncredited)
Arthur Mullard
Christopher Wellington St. John Denny
Richard Haydn
Guard at Bolshoi Theatre (uncredited)
Jim Brady
Plainclothes Police Officer at Airport (uncredited)
Christopher Rhodes
Joe Brooks
Bernard Miles
Svetlana Mikhailovna
Anna Valentina
Steve Quillan
Kenneth More
Valentina Alexandrovna
Belita
Commissar
Karl Stepanek
Lieutenant
Theodore Bikel
Kuragin
Frederick Valk
Director
Delmer Daves
Director of Photography
Robert Krasker
Producer
Clarence Brown
Art Direction
Alfred Junge
Editor
Frank Clarke
Music
Hans May
Novel
Paul Winterton
Screenplay
Ronald Millar
George Froeschel
Production Secretary
Noreen Hipwell