Scotland Yard must discover why people are being murdered by a monstrous dog at Blackwood Castle.
| Actor | Role |
|---|---|
 Heinz DracheHumphrey Connery | Humphrey Connery |
 Karin BaalJane Wilson | Jane Wilson |
 Horst TappertDouglas Fairbanks | Douglas Fairbanks |
 Siegfried SchürenbergSir John | Sir John |
 Agnes WindeckLady Agathy Beverton | Lady Agathy Beverton |
 Ilse PagéMiss Finley | Miss Finley |
 Mady RahlCatharina Wilson | Catharina Wilson |
 Uta LevkaDorothy Cornick | Dorothy Cornick |
 Hans SöhnkerAnwalt Robert Jackson | Anwalt Robert Jackson |
 Otto SternKapitän Wilson | Kapitän Wilson |
 Alexander EngelDoc Adams | Doc Adams |
 Tilo von BerlepschLord Beverton | Lord Beverton |
 Harry WüstenhagenKen Nelson | Ken Nelson |
 Kurd PieritzEdward Baldwin | Edward Baldwin |
| AArthur BinderGrimsby | Grimsby |
 Rainer BrandtTom Heynes | Tom Heynes |
 Alfred VohrerEdgar Wallace ( Voice ) | Edgar Wallace ( Voice ) |
| KKurt WaitzmannNot listed | Not listed |