Directed by
| T. Hayes Hunter | ||
Writing Credits
| Frank King | ... | (by) (as Dr. Frank King) & |
| Leonard Hines | ... | (by) |
| Roland Pertwee | ... | (screen version by) & |
| John Hastings Turner | ... | (screen version by) |
| Rupert Downing | ... | (adaptation) |
Cast (in credits order) verified as complete
| Boris Karloff | ... | Prof. Henry Morlant | |
| Cedric Hardwicke | ... | Broughton | |
| Ernest Thesiger | ... | Laing | |
| Dorothy Hyson | ... | Betty Harlon | |
| Anthony Bushell | ... | Ralph Morlant | |
| Kathleen Harrison | ... | Kaney | |
| Harold Huth | ... | Aga Ben Dragore | |
| D.A. Clarke-Smith | ... | Mahmoud | |
| Ralph Richardson | ... | Nigel Hartley | |
| Rest of cast listed alphabetically: | |||
| Jack Raine | ... | Davis the Chauffeur (uncredited) | |
| George Relph | ... | Doctor (uncredited) | |
Produced by
| Michael Balcon | ... | producer (uncredited) |
Music by
| Louis Levy | ||
| Leighton Lucas | ... | (uncredited) |
Cinematography by
| Günther Krampf | ... | (as Gunther Krampf) (photography) |
Editing by
| Ian Dalrymple | ||
| Ralph Kemplen | ||
Art Direction by
| Alfred Junge | ... | (as A. Junge) |
Makeup Department
| Heinrich Heitfeld | ... | makeup artist (uncredited) |
Production Management
| Geoffrey Boothby | ... | unit manager |
Second Unit Director or Assistant Director
| R. Lyons | ... | assistant director |
Sound Department
| Peter Birch | ... | sound recordist (as A. Birch) |
Additional Crew
| George Gunn | ... | production personnel |
| Angus MacPhail | ... | production personnel |
| John Croydon | ... | production assistant (uncredited) |
