Montgomery Clift

Character: Professor James Bower

Hardy Krüger

Character: Counselor Peter Heinzmann

Macha Méril

Character: Frieda Hoffmann

David Opatoshu

Character: Orlovsky

Christine Delaroche

Character: Ingrid Weiß

Hannes Messemer

Character: Dr. Saltzer

Karl Lieffen

Character: Major Windisch

Uta Levka

Character: Mädchen unter der Dusche

Roddy McDowall

Character: Agent Adams

Johannes Buzalski

Character: Agent (uncredited)

Eckart Dux

Character: Professor James Bower (voice) (uncredited)

Jean-Luc Godard

Character: Orlovsky's Friend (uncredited)

Eduard Linkers

Character: Fluchthelfer Franz Ritter (uncredited)

Franz Rudnick

Character: Dr. Saltzer (voice) (uncredited)

Rolf Zacher

Character: Tommy (uncredited)