Directed by
| William Nigh | ... | (directed by) |
Writing Credits
| Harvey Gates | ... | (original story) |
| Harvey Gates | ... | (screenplay) |
| Robert Kehoe | ... | (story "Black Dragon") (uncredited) |
Cast (in credits order) verified as complete
| Bela Lugosi | ... | Dr. Melcher - aka Monsieur Colomb / Cell Prisoner | |
| Joan Barclay | ... | Alice Saunders | |
 |
George Pembroke | ... | Dr. Bill Saunders |
| Clayton Moore | ... | Dick Martin | |
| Robert Frazer | ... | Amos Hanlin | |
| Edward Peil Sr. | ... | Ryder (as Edward Piel Sr.) | |
| Robert Fiske | ... | Phillip Wallace | |
|
|
Irving Mitchell | ... | John Van Dyke |
| Kenneth Harlan | ... | FBI Chief Colton | |
|
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Max Hoffman Jr. | ... | Kearney |
| Frank Melton | ... | FBI Agent | |
|
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Joseph Eggenton | ... | Stevens |
| I. Stanford Jolley | ... | The Dragon (as Stanford Jolley) | |
| Rest of cast listed alphabetically: | |||
| Jack Cheatham | ... | Policeman (uncredited) | |
|
|
Jack Chefe | ... | Hotel Clerk (uncredited) |
| Bernard Gorcey | ... | The Cabbie (uncredited) | |
|
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Jack Holmes | ... | Industrialist (uncredited) |
| Ethelreda Leopold | ... | Girl at Party (uncredited) | |
| Carl M. Leviness | ... | Industrialist (uncredited) | |
Produced by
| Jack Dietz | ... | producer (produced by) |
| Sam Katzman | ... | producer (produced by) |
| Barney A. Sarecky | ... | associate producer |
Music by
| Johnny Lange | ... | (as Lange) |
| Lew Porter | ... | (as Porter) |
Cinematography by
| Arthur Reed | ... | (as Art Reed) (photography) |
Editing by
| Carl Pierson | ... | film editor |
Art Direction by
| Dave Milton | ... | (as David Milton) |
Production Management
| Ed W. Rote | ... | production manager |
Second Unit Director or Assistant Director
| Arthur Hammond | ... | assistant director |
| Gerald Schnitzer | ... | assistant director |
Sound Department
| Glen Glenn | ... | sound engineer |
Music Department
| Heinz Roemheld | ... | composer: stock music (uncredited) |
