Kirk Douglas
Dr. Rolf Pedersen

Richard Harris
Knut Straud

Ulla Jacobsson
Anna Pedersen

Michael Redgrave
Uncle

David Weston
Arne

Anton Diffring
Major Frick

Eric Porter
Terboven

Mervyn Johns
Col. Wilkinson

Jennifer Hilary
Sigrid

Roy Dotrice
Jensen

Barry Jones
Professor Logan

Ralph Michael
Nilssen

Geoffrey Keen
General Bolt

Maurice Denham
Doctor

Robert Ayres
General Courts

Alan Howard
Oli

Patrick Jordan
Henrik

William Marlowe
Claus

Karl Stepanek
Hartmuller

Faith Brook
Woman on Bus

Elvi Hale
Mrs. Sandersen

Gerard Heinz
Erhardt

Russell Waters
Mr. Sandersen

Annette Andre
Girl Student (uncredited)