Obsada:

• Louis Hayward Philip 'Scotty' Grayson
• Dennis O'Keefe Daniel F. O'Hara
• Louise Allbritton Dr. 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
• Paul Bryar Ivan
• Fred Coby FBI Chemist Fred
• Bert Davidson FBI Agent Potter
• John Hamilton G.W. Hunter
• Myron Healey FBI Agent Thompson
• Marten Lamont FBI chemist
• Jimmy Lloyd FBI Agent Alison
• Howard Negley Feodore
• Steve Pendleton Police Detective Gaines
• Lee Phelps Cop
• Grandon Rhodes Adolph Mizner
• Keith Richards FBI Agent Miller
• Suzanne Ridgeway Extra at Murder Scene
• Tamara Shayne Landlady Mrs. Ecko
• Arthur Space Mr. North
• Gale Storm Voice on Tape Recorder
• William Tannen FBI Chemist
• Ray Teal Police Sergeant
• Arthur Tovey Plant Worker
• Crane Whitley Curly