Cast and characters:
Boris Karloff as Doctor Gustav Niemann
Lon Chaney, Jr. as Lawrence “Larry” Talbot/The Wolf Man
John Carradine as Count Dracula, also known as Baron Latos
J. Carrol Naish as Daniel
Elena Verdugo as Ilonka
Anne Gwynne as Rita Hussman
Peter Coe as Karl Hussman
Lionel Atwill as Inspector Arnz
George Zucco as Bruno Lampini
Sig Ruman as Bürgermeister Hussman
William Edmunds as Fejos
Charles F. Miller as Tobermann
Philip Van Zandt as Müller
Julius Tannen as Hertz
Hans Herbert as Meier
Dick Dickinson as Born
Glenn Strange as Frankenstein’s monster
Michael Mark as Strauss

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Film Facts:
Working titles, which included Chamber of Horrors (a reference to Lampini’s travelling horror show) and The Devil’s Brood, emphasized the multi-monster nature of the story.