Trailer
Images
 | Stuart Erwin as Dwight Wilson |
 | Dorothy Wilson as Patricia Merrick, also known as Mlle. Mystera |
 | Warner Oland as Dr. Paul Cornelius |
 | Dudley Digges as Horace Merrick |
 | Gertrude Hoffmann as Mattie (as Gertrude W. Hoffman) |
 | Oscar Apfel as Chief of Detectives John F. O'Hara |
 | Frank Reicher as Joe Valerie |
 | Jane Darwell as Mrs. Marble |
 | Stanley Blystone as Police Car Driver (uncredited) |
 | Ed Brady as Paddywagon Cop (uncredited) |
 | Tom Brower as Detective Schultz (uncredited) |
 | Pat O'Malley as Detective Brady (uncredited) |
 | Ted Oliver as Police Desk Sergeant Hamilton (uncredited) |
 | Irving Pichel as Police Radio Announcer (voice) (uncredited) |
 | Max Wagner as Policeman in Car (uncredited) |
| Writing | |
| Ralph Block | Screenplay |
| Marion Dix | Screenplay |
Production | |
| Shirley C. Burden | Production Assistant |
| Merian C. Cooper | Production Executive |
Crew | |
| Lucien N. Andriot | Cinematography |
Editing | |
| William Hamilton | Editor |
Directing | |
| Walter Mayo | Assistant Director |
Art | |
| Carroll Clark | Settings |
| Van Nest Polglase | Settings |
Sound | |
| Philip Faulkner Jr. | Sound Recordist |
Camera | |
| Joseph F. Biroc | Camera Operator |
| Charles Bohny | Assistant Camera |
Sound | |
| Max Steiner | Music Director |
Directing | |
| Irving Pichel | Director |
Writing | |
| Garrett Fort | Screenplay |
| Edgar Wallace | Novel |
