Cast & crew
Mr. Wong, Detective (1938)
Directed by William Nigh Written by Houston Branch
Cast
| Boris Karloff | James Lee Wong |
| Grant Withers | Police Capt. Sam Street |
| Maxine Jennings | Myra Ross |
| Evelyn Brent | Olga Petroff / Countess Dubois / Sophie Dome |
| George Lloyd | Devlin |
| Lucien Prival | Anton Mohl |
| Hooper Atchley | Christian Wilk |
| John St. Polis | Carl Roemer |
| William Gould | Theodore Meisle |
| John Hamilton | Simon Dayton |
| Wilbur Mack | Russell |
| Lee Tung Foo | Tchin |
| Lynton Brent | Tommy |
| Grace Wood | Mrs. Roemer |
| Frank Bruno | Lescardi (uncredited) |
| Ed Cassidy | Ambulance Doctor (uncredited) |
| George DeNormand | John (uncredited) |
| Lester Dorr | Coroner (uncredited) |
| Wheaton Chambers | Chemistry Lab Director (uncredited) |
| Clancy Cooper | Warehouse Man (uncredited) |
| Herbert Evans | Wilk's Butler (uncredited) |
| Dick Reinhart | Dock Worker (uncredited) |
Crew
| William Nigh | Director |
| Houston Branch | Screenplay |
| W.B. Eason | Assistant Director |
| Scott R. Dunlap | Producer |
| William T. Lackey | Producer |
| Russell F. Schoengarth | Editor |
| E.R. Hickson | Technical Supervisor |
| Karl Zint | Recording Supervision |
| Scott R. Dunlap | Production Manager |
| Abe Meyer | Music Director |
| Gordon Bau | Makeup Artist |
| Edward J. Kay | Original Music Composer |
| Charles J. Bigelow | Production Manager |
| Harry Grundstrum | Props |
| Harry Neumann | Director of Photography |
| Hugh Wiley | Original Story |