- Curt Siodmakoriginal screenplay
- Lon Chaney Jr.(as Lon Chaney)
Rest of cast listed alphabetically
- Jessie Arnold(uncredited)
- Gertrude Astor(uncredited)
- Harry Cording(uncredited)
- Margaret Fealy(uncredited)
- Gibson Gowland(uncredited)
- Mercedes Hill(uncredited)
- Leyland Hodgson(uncredited)
- Olaf Hytten(uncredited)
- La Riana(uncredited)
- Connie Leon(uncredited)
- Doris Lloyd(uncredited)
- Ottola Nesmith(uncredited)
- Monty O'Grady(uncredited)
- Eddie Polo(uncredited)
- Ernie Stanton(uncredited)
- Anne G. Sterling(uncredited)
- Fanny Sterling(uncredited)
- Tom Stevenson(uncredited)
- Harry Stubbs(uncredited)
- Eric Wilton(uncredited)
- Jack J. Grossexecutive producer (uncredited)
- George Waggnerproducer
- Charles Previncomposer (uncredited)
- Hans J. Saltercomposer (uncredited)
- Frank Skinnercomposer (uncredited)
- Joseph A. Valentinedirector of photography (as Joseph Valentine)
- Ted J. Kenteditor (as Ted Kent)
- Russell A. Gausmanset decorator (as R.A. Gausman)
- Jack P. Piercemakeup artist
- Vernon Keaysassistant director
- Robert F. Boyleassociate art director (as Robert Boyle)
- Ellis Burmanprop maker: wolf head cane (uncredited)
- Bernard B. Brownsound director
- Ellis Burmanspecial effects technician (uncredited)
- John P. Fultonspecial effects (uncredited)
- Eugene Joseffcostume jeweller (uncredited)
- Charles Previnmusical director
- Hans J. Salterorchestrator (uncredited)
- Frank Skinnerorchestrator (uncredited)
- Elvira Betroneitalian voice dubbing: Maria Ouspenskaya (uncredited)
- Nella Maria Bonoraitalian voice dubbing: Evelyn Ankers (uncredited)
- Ivo Garraniitalian voice dubbing: Lon Chaney Jr. (uncredited)
- Gemma Griarottiitalian voice dubbing: Fay Helm (uncredited)
- Michele Malaspinaitalian voice dubbing: Warren William (uncredited)
- Guido Notariitalian voice dubbing: Claude Rains (uncredited)
- Giusi Raspani Dandoloitalian voice dubbing: Doris Lloyd (uncredited)
- Vittorio Sanipoliitalian voice dubbing: Ralph Bellamy (uncredited)
Crew verified as complete
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