| Person | Type | Job | Role(s) |
|---|---|---|---|
 Arthur Hilton | Crew | Editing | Editor |
Bernard B. Brown | Crew | Sound | Sound Supervisor |
Charles Henderson | Crew | Sound | Music |
Charles Previn | Crew | Sound | Orchestrator |
 David Sharpe | Crew | Crew | Stunts |
Elwood Bredell | Crew | Camera | Director of Photography |
 Frank Skinner | Crew | Sound | Music |
 George Waggner | Crew | Writing | Screenplay, Director |
Hans J. Salter | Crew | Sound | Original Music Composer, Music Director |
Harold H. MacArthur | Crew | Art | Art Direction |
Harry Essex | Crew | Writing | Story |
Jack Bernhard | Crew | Production | Associate Producer |
Jack Otterson | Crew | Art | Art Direction |
 Jack Pierce | Crew | Costume & Make-Up | Makeup Artist |
John P. Fulton | Crew | Crew | Special Effects |
Len Golos | Crew | Writing | Story |
Russell A. Gausman | Crew | Art | Set Decoration |
Sid Schwartz | Crew | Writing | Story |
Vera West | Crew | Costume & Make-Up | Costume Design |
Charles Carroll | Crew | Sound | Sound |
 Anne Nagel | Cast | Actress | June Lawrence |
 Ben Taggart | Cast | Actor | Detective Sergeant Regan |
 Bob Reeves | Cast | Actor | Prison Guard (uncredited) |
 Byron Foulger | Cast | Actor | Alienist #2 |
 Chester Gan | Cast | Actor | Chinese Boy, Wong |
 Constance Bergen | Cast | Nurse | |
David Sharpe | Cast | Actor | Hay Wagon Passenger (uncredited) |
Douglas Evans | Cast | Actor | Police Radio Announcer (uncredited) |
Francis Sayles | Cast | Actor | Frank Davis (uncredited) |
 Frank Albertson | Cast | Actor | Mark Adams |
 Frank O'Connor | Cast | Actor | Detective |
Gary Breckner | Cast | Actor | Radio Announcer (uncredited) |
 George Meader | Cast | Actor | Dr. Bruno |
 Ivan Miller | Cast | Actor | Doctor |
Jack Gardner | Cast | Actor | Reporter (uncredited) |
 James Blaine | Cast | Actor | Charlie, Prison Guard (uncredited) |
 Jessie Arnold | Cast | Actress | Mrs. Frank Davis (uncredited) |
 John Dilson | Cast | Actor | Medical Examiner |
John Ellis | Cast | Actor | Assistant District Attorney (uncredited) |
 Lionel Atwill | Cast | Actor | Dr. Paul Rigas |
 Lon Chaney Jr. | Cast | Actor | Dan McCormick |
Lowell Drew | Cast | Jury Foreman (uncredited) | |
Paul Scott | Cast | Prison Chaplain (uncredited) | |
 Russell Hicks | Cast | Actor | Warden Harris (uncredited) |
 Samuel S. Hinds | Cast | Actor | Dr. John Lawrence |
Tom Quinn | Cast | Actor | Detective (uncredited) |
Victor Zimmerman | Cast | Actor | Dynamo Operator #2 (uncredited) |
 William B. Davidson | Cast | Actor | District Attorney Ralph B. Stanley |
 William Hall | Cast | Mike - Dynamo Operator (uncredited) | |
Wright Kramer | Cast | Actor | Judge (uncredited) |
Mel Ruick | Cast | Actor | Defense Attorney (uncredited) |
Corky | Cast | Corky the Dog (uncredited) | |
| Person | Type | Job | Role(s) |
