Captain Mike Layton
Diane Greene
Irk
Azar
Colonel Dawson
Lt. Vassilov
Frank Bimble (as Nick Jordan)
Herman Wesson
Replicant
Professor Burton
(as Fabio Roscioli)
Dr. Helen Parker (as Gisella Hahn)
Captain Connolly
Narrator (voice)
Guard (uncredited)
Journalist (uncredited)
Svensson (uncredited)
Charles Sotus (uncredited)