L'espion

Montgomery Clift

Professor James Bower

Hardy Krüger

Counselor Peter Heinzmann

Macha Méril

Frieda Hoffmann

David Opatoshu

Orlovsky

Christine Delaroche

Ingrid Weiß

Hannes Messemer

Dr. Saltzer

Karl Lieffen

Major Windisch

Uta Levka

Mädchen unter der Dusche

Roddy McDowall

Agent Adams

Johannes Buzalski

Agent (uncredited)

Eckart Dux

Professor James Bower (voice) (uncredited)

Jean-Luc Godard

Orlovsky's Friend (uncredited)

Eduard Linkers

Fluchthelfer Franz Ritter (uncredited)

Franz Rudnick

Dr. Saltzer (voice) (uncredited)