Directed by
| William Nigh | ||
Writing Credits
| Edgar Wallace | ... | (novel) |
| Wellyn Totman | ... | (screen play by) |
Cast (in credits order) complete, awaiting verification
| Noah Beery | ... | Capt. John Holling | |
| Astrid Allwyn | ... | Lila Kane | |
| Edwin Maxwell | ... | Major Pope | |
| Gustav von Seyffertitz | ... | Inspector Von Kessling | |
| Ralph Lewis | ... | Prof. Grimson | |
| Cornelius Keefe | ... | First Officer Cliff Rogers | |
| Zeffie Tilbury | ... | Granny Plimpton | |
| Boothe Howard | ... | Capt. Downey | |
| Howard Hickman | ... | Dr. Howard | |
 |
Jerry Stewart | ... | Edgar Morton |
| George 'Gabby' Hayes | ... | Joe, the watchman (as George Hayes) | |
| George Cleveland | ... | Simms the Steward | |
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John M. Sullivan | ... | Watson (as John Maurice Sullivan) |
| Rest of cast listed alphabetically: | |||
|
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Raymond Brown | ... | Spy Chief (uncredited) |
| Gordon De Main | ... | Cmdr. Bryson (uncredited) | |
| Olaf Hytten | ... | Grimson's Aide (uncredited) | |
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George Nash | ... | Waiter (uncredited) |
| Harry Schultz | ... | Aide (uncredited) | |
| Slim Whitaker | ... | Crewman (uncredited) | |
Produced by
| Paul Malvern | ... | producer |
Cinematography by
| Archie Stout | ||
Editing by
| Carl Pierson | ||
Sound Department
| John Stransky Jr. | ... | sound recordist |
Music Department
| Abe Meyer | ... | musical director (uncredited) |
| Oliver Wallace | ... | composer: stock music (uncredited) |
Additional Crew
| Trem Carr | ... | vice president in charge of production |
| E.R. Hickson | ... | technical director |
