- Vlassov:
- Yul Brynner
- Allan Da vies:
- Henry Fonda
- Philip Boyle:
- Dirk Bogarde
- Lucien Berthon:
- Philippe Noiret
- Tavel:
- Michel Bouquet
- Lepeke:
- Martin Held
- Computer programming chief:
- Farley Granger
- Annabel Lee:
- Virna Lisi
- Deval:
- Guy Trejean
- Suzanne:
- Marie Dubois
- Kate Cross:
- Elga Anderson
- Interrogator:
- Robert Alda