Directed by
| William Nigh | ||
Writing Credits
| Houston Branch | ... | (screen play) |
| Hugh Wiley | ... | (magazine series "James Lee Wong") |
Cast (in credits order) verified as complete
| Boris Karloff | ... | Mr. Wong | |
| Grant Withers | ... | Capt. Street | |
| Maxine Jennings | ... | Myra | |
| Evelyn Brent | ... | Olga | |
| George Lloyd | ... | Devlin | |
| Lucien Prival | ... | Mohl | |
| John St. Polis | ... | Roemer (as John St.Polis) | |
| William Gould | ... | Meisle | |
| Hooper Atchley | ... | Wilk | |
| John Hamilton | ... | Dayton | |
| Wilbur Mack | ... | Russell | |
| Lee Tong Foo | ... | Tchin | |
| Lynton Brent | ... | Tommy | |
 |
Grace Wood | ... | Mrs. Roemer |
| Rest of cast listed alphabetically: | |||
|
|
Frank Bruno | ... | Lescardi (uncredited) |
| Ed Cassidy | ... | Ambulance Doctor (uncredited) | |
| Wheaton Chambers | ... | Chemistry Lab Director (uncredited) | |
| Clancy Cooper | ... | Warehouse Man (uncredited) | |
| George DeNormand | ... | John (uncredited) | |
| Lester Dorr | ... | Coroner (uncredited) | |
| Herbert Evans | ... | Wilk's Butler (uncredited) | |
|
|
Dick Reinhart | ... | Dock Worker (uncredited) |
Produced by
| Scott R. Dunlap | ... | producer (uncredited) |
| William T. Lackey | ... | associate producer (as William Lackey) |
Music by
| Edward J. Kay | ... | (uncredited) |
Cinematography by
| Harry Neumann | ... | director of photography |
Editing by
| Russell F. Schoengarth | ... | (as Russell Schoengarth) |
Makeup Department
| Gordon Bau | ... | makeup artist (uncredited) |
Production Management
| Charles J. Bigelow | ... | production manager (as C.J. Bigelow) |
| Scott R. Dunlap | ... | in charge of production |
Second Unit Director or Assistant Director
| W.B. Eason | ... | assistant director |
Art Department
| Harry Grundstrum | ... | prop man (uncredited) |
Sound Department
| Karl Zint | ... | recording engineer |
Music Department
| Abe Meyer | ... | musical director (uncredited) |
Additional Crew
| E.R. Hickson | ... | technical director |
