| Robert Douglas | ... | Capt. Markham | |
| Richard Cromwell | ... | Lt. Bill Armstrong | |
| Hazel Terry | ... | Pamela Brent | |
| H.B. Warner | ... | British Consul Brent | |
| Noah Beery | ... | The Presidente of Bianco | |
| Esme Percy | ... | Diego de Costa | |
| Frederick Culley | ... | The Admiral | |
| Henry Victor | ... | Lt. d'Enriquo | |
| Binkie Stuart | ... | Jennifer | |
| Julie Suedo | ... | Juanita (the assassin) | |
| rest of cast listed alphabetically: | |||
| Richard Ainley | ... | Lieutenant (uncredited) | |
Directed by | |||
| Norman Walker | |||
Writing credits(in alphabetical order) | ||
| H.T. Bishop | story collaboration | |
| Gerald Elliott | scenario | |
| Harrison Owen | additional dialogue | |
| Guy Pollock | story collaboration | |
| L. DeCosta Ricci | story (as Bartimeus) | |
Produced by | |||
| Herbert Wilcox | .... | producer | |
Original Music by | |||
| Noel Gay | |||
Cinematography by | |||
| Claude Friese-Greene | |||
Film Editing by | |||
| Winifred Cooper | |||
Art Direction by | |||
| Lawrence P. Williams | (as L.P. Williams) | ||
Production Management | |||
| Tom White | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Pat Walker | .... | assistant director | |
| Russell Wootton | .... | assistant director (as R. Wootton) | |
Sound Department | |||
| John Dennis | .... | sound recordist (as J. Dennis) | |
| L.E. Overton | .... | sound recordist | |
Music Department | |||
| Geraldo | .... | musical director | |
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| The Secret of Treasure Island | The Spider Returns | King of Chinatown | The Phantom Rider | Trader Tom of the China Seas |
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| Full cast and crew | Company credits | IMDb Adventure section |
| IMDb UK section |