Oyuncular
Louis Hayward
Philip 'Scotty' Grayson
Dennis O'Keefe
Daniel F. O'Hara
Louise Allbritton
Dr. Anastasia 'Toni' Neva
Carl Esmond
Dr. Ritter von Stolb
Onslow Stevens
Igor Braun
Raymond Burr
Krebs
Art Baker
Dr. Frederick Townsend
Lowell Gilmore
Dr. William Forrest
Philip Van Zandt
Anton Radchek
Charles Evans
Dr. Homer Allen
Frank Ferguson
Carl Bemish
Reed Hadley
Narrator (voice)
Ray Teal
Police Sergeant
William Tannen
FBI Chemist
Gale Storm
Voice on Tape Recorder
