| Person | Type | Job | Role(s) |
|---|---|---|---|
 Bertram Millhauser | Crew | Writing | Story |
Dorothy B. Cormack | Crew | Directing | Script Supervisor |
Edward Colman | Crew | Camera | Camera Operator |
Edward Small | Crew | Production | Producer |
George Bruce | Crew | Writing | Screenplay |
George Robinson | Crew | Camera | Director of Photography |
 Gordon Douglas | Crew | Directing | Director |
Grant Whytock | Crew | Production | Producer |
Howard Bristol | Crew | Art | Set Decoration |
James E. Newcom | Crew | Editing | Editor |
John R. Carter | Crew | Sound | Sound |
Norbert A. Myles | Crew | Costume & Make-Up | Makeup Artist |
Paul Sawtell | Crew | Sound | Original Music Composer |
Ridgeway Callow | Crew | Directing | Assistant Director |
Rudolph Sternad | Crew | Art | Art Direction |
William Dalton | Crew | Camera | Grip |
Ken Lobben | Crew | Camera | Still Photographer |
Margaret Martin | Crew | Costume & Make-Up | Hairstylist |
Joseph Small | Crew | Production | Unit Manager |
Edward P. Lambert | Crew | Costume & Make-Up | Wardrobe Supervisor |
 Art Baker | Cast | Actor | Dr. Frederick Townsend |
 Arthur Space | Cast | Actor | Mr. North |
 Arthur Tovey | Cast | Actor | |
 Carl Esmond | Cast | Actor | Dr. Ritter von Stolb |
 Charles Evans | Cast | Actor | Dr. Homer Allen |
 Crane Whitley | Cast | Actor | |
 Dennis O'Keefe | Cast | Actor | Daniel F. O'Hara |
 Frank Ferguson | Cast | Actor | Carl Bemish |
Fred Coby | Cast | Actor | |
 Gale Storm | Cast | Actress | Voice on Tape Recorder |
 Grandon Rhodes | Cast | Actor | Adolph Mizner |
 Howard Negley | Cast | Actor | Feodore |
 Jimmy Lloyd | Cast | Actor | FBI Agent Alison |
 John Hamilton | Cast | Actor | G.W. Hunter |
 Keith Richards | Cast | Actor | FBI Agent Miller |
 Lee Phelps | Cast | Actor | |
 Louis Hayward | Cast | Actor | Philip 'Scotty' Grayson |
 Louise Allbritton | Cast | Actress | Dr. Anastasia 'Toni' Neva |
 Lowell Gilmore | Cast | Actor | Dr. William Forrest |
 Marten Lamont | Cast | Actor | |
 Myron Healey | Cast | Actor | FBI Agent Thompson |
 Onslow Stevens | Cast | Actor | Igor Braun |
 Paul Bryar | Cast | Actor | |
 Philip Van Zandt | Cast | Actor | Anton Radchek |
 Ray Teal | Cast | Actor | Police Sergeant |
 Raymond Burr | Cast | Actor | Krebs |
 Reed Hadley | Cast | Actor | Narrator (voice) |
 Steve Pendleton | Cast | Actor | Police Detective Gaines |
 Suzanne Ridgway | Cast | Actress | |
 Tamara Shayne | Cast | Actress | Mrs. Ecko, the Landlady |
 William Tannen | Cast | Actor | FBI Chemist |
Bert Davidson | Cast | ||
| Person | Type | Job | Role(s) |
