- Roy William Neilldirector (directed by)
- Leonard Leescreenplay by
- Frank Gruberadaptation by
- Arthur Conan Doyleadapted from a story by (as Sir Arthur Conan Doyle)
Cast
(in credits order) verified as complete
- Edmund Breon(as Edmond Breon)
- Frederick Worlock(as Frederic Worlock)
Rest of cast listed alphabetically
- Harry Allen(uncredited)
- Frank Baker(uncredited)
- Guy Bellis(uncredited)
- Wilson Benge(uncredited)
- Ted Billings(uncredited)
- Barbara Brewster(uncredited)
- Gloria Brewster(uncredited)
- Lillian Bronson(uncredited)
- Jack Curtis(uncredited)
- Tom Dillon(uncredited)
- Bess Flowers(uncredited)
- Topsy Glyn(uncredited)
- Bobbie Hale(uncredited)
- Charlie Hall(uncredited)
- Boyd Irwin(uncredited)
- Delos Jewkes(uncredited)
- Tiny Jones(uncredited)
- Eric Mayne(uncredited)
- Mathew McCue(uncredited)
- Frank Mills(uncredited)
- Hans Moebus(uncredited)
- Wallace Scott(uncredited)
- Harry Semels(uncredited)
- Sally Shepherd(uncredited)
- Florence Wix(uncredited)
- Howard Benedictexecutive producer
- Roy William Neillproducer (produced by)
- Maury Gertsmandirector of photography
- Saul A. Goodkindfilm editor
- Martin Obzinaart director (art direction)
- Jack Ottersonart director (art direction)
- Russell A. Gausmanset decorator (set decorations)
- Edward R. Robinsonset decorator (set decorations)
- Carmen Dirigohair stylist
- Jack P. Piercedirector of make-up
- Melville Shyerassistant director
- Judson Coxassistant director (uncredited)
- Glenn E. Andersontechnician (as Glenn E.Anderson)
- Bernard B. Browndirector of sound
- Ronald Piercesound mixer (uncredited)
- Russell Lawsonmatte artist (uncredited)
- Robert Tafurstunt double (uncredited) / stunt double: Basil Rathbone (uncredited)
- John J. Martinsecond camera operator (uncredited)
- Eugene Joseffcostume jeweler (uncredited)
- Milton Rosenmusical director
- Richard Hagemancomposer: stock music (uncredited)
- Delos Jewkessinging voice: "Ya Never Know Just 'Oo You're Gonna Meet" (uncredited)
- William Lavacomposer: stock music (uncredited)
- Charles Previncomposer: stock music (uncredited)
- Ethmer Rotenmusician: flute (uncredited)
- Hans J. Saltercomposer: stock music (uncredited)
- Paul Sawtellcomposer: stock music (uncredited)
- Frank Skinnercomposer: stock music (uncredited)
- Raymond Kesslerdialogue director
Crew verified as complete
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