Insurance agent-physician collects on policies of men murdered by a disfigured resident of the home for the blind where he acts as doctor-on-call.
| Actor | Role |
|---|---|
 Bela LugosiDr. Feodor Orloff / Prof. John Dearborn | Dr. Feodor Orloff / Prof. John Dearborn |
 Hugh WilliamsDet. Insp. Larry Holt | Det. Insp. Larry Holt |
 Greta GyntDiana Stuart | Diana Stuart |
 Edmon RyanLieutenant Patrick O'Reilly | Lieutenant Patrick O'Reilly |
| WWilfred WalterBlind Jake | Blind Jake |
| AArthur E. OwenDumb Lou | Dumb Lou |
| AAlexander FieldFred Grogan | Fred Grogan |
| GGerald PringHenry Stuart | Henry Stuart |
 O.B. ClarenceProf. John Dearborn (voice) | Prof. John Dearborn (voice) |
 May HallattPolice Constable Griggs | Police Constable Griggs |
 Bryan HerbertPolice Sgt. Walsh | Police Sgt. Walsh |
| CCharles PenroseMorrison, undercover detective | Morrison, undercover detective |
 Julie SuedoOrloff's Secretary | Orloff's Secretary |