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)
Rolf Zacher
Tommy (uncredited)