Directed by
| Henry Edwards | ||
Writing Credits
| Alice Campbell | ... | (by) |
| Cyril Campion | ... | (adapted for the screen by) and |
| H. Fowler Mear | ... | (adapted for the screen by) |
| Heinrich Fraenkel | ... | (adaptation) (as H. Fraenkel) |
| Alice Campbell | ... | (novel) (uncredited) |
Cast (in credits order)
| Boris Karloff | ... | Doctor Victor Sartorius | |
 |
Joan Wyndham | ... | Eve Rowe |
| Arthur Margetson | ... | Roger Clifford | |
| Mona Goya | ... | Yvonne Clifford | |
| Anthony Ireland | ... | Capt. Arthur Halliday (as Antony Ireland) | |
| Morton Selten | ... | Sir Charles Clifford (as Morton Setten) | |
|
|
Nina Boucicault | ... | Mary Clifford (as Mina Boucicault) |
| Gibb McLaughlin | ... | Jacques | |
| J.H. Roberts | ... | Chalmers (as H.H. Roberts) | |
|
|
Victor Rietti | ... | Doctor Bousquet (as V. Rietti) |
| Rest of cast listed alphabetically: | |||
|
|
Wilfrid Caithness | ... | Morrocan Official (uncredited) |
Produced by
| Edward L. Alperson | ... | executive producer (uncredited) |
| Julius Hagen | ... | producer |
Music by
| W.L. Trytel | ... | (uncredited) |
Cinematography by
| Sydney Blythe | ... | (photography) |
| William Luff | ... | (photography) |
Editing by
| Michael C. Chorlton | ... | (uncredited) |
Art Direction by
| James A. Carter | ... | (uncredited) |
Sound Department
| Baynham Honri | ... | sound (uncredited) |
Music Department
| W.L. Trytel | ... | musical director |
Additional Crew
| Edward L. Alperson | ... | presenter |
