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)
L'Espion
Released