| Person | Type | Job | Role(s) |
|---|---|---|---|
 Albert S. D'Agostino | Crew | Art | Art Direction |
 Bernard W. Burton | Crew | Editing | Editor |
Edmund Grainger | Crew | Production | Producer |
 Franz Waxman | Crew | Sound | Original Music Composer |
George Robinson | Crew | Camera | Director of Photography |
Gilbert Kurland | Crew | Sound | Sound Supervisor |
Howard Higgin | Crew | Writing | Original Story |
 Jack Pierce | Crew | Costume & Make-Up | Makeup Artist |
John Colton | Crew | Writing | Screenplay |
John P. Fulton | Crew | Visual Effects | Visual Effects |
 Lambert Hillyer | Crew | Directing | Director |
 Otto Lederer | Crew | Costume & Make-Up | Makeup Artist |
Raymond Lindsay | Crew | Crew | Special Effects |
Fred S. Meyer | Crew | Production | Executive Producer |
Charles Carroll | Crew | Sound | Sound Recordist |
Camille Collins | Crew | Production | Production Secretary |
Douglas Hodges | Crew | Writing | Story |
 Bela Lugosi | Cast | Actor | Dr. Felix Benet |
 Beulah Bondi | Cast | Actress | Lady Arabella Stevens |
 Boris Karloff | Cast | Actor | Dr. Janos Rukh |
 Frances Drake | Cast | Actress | Diana Rukh |
 Frank Lawton | Cast | Actor | Ronald Drake |
 Frank Reicher | Cast | Actor | Professor Meiklejohn |
 Georges Renavent | Cast | Actor | Chief of the Surete |
 May Beatty | Cast | Actress | Mme. LeGrand (uncredited) |
 Nydia Westman | Cast | Actress | Briggs (uncredited) |
 Paul McAllister | Cast | Actor | Papa LaCosta (uncredited) |
 Paul Weigel | Cast | Actor | Monsieur Noyer |
 Robert Graves | Cast | Actor | Gendarme (uncredited) |
 Violet Kemble Cooper | Cast | Actress | Mother Rukh |
 Walter Kingsford | Cast | Actor | Sir Francis Stevens |
 Ynez Seabury | Cast | Actress | Celeste (uncredited) |
| Person | Type | Job | Role(s) |
