Basil Rathbone
Sherlock Holmes
Nigel Bruce
Dr. John H. Watson
Gale Sondergaard
Adrea Spedding
Dennis Hoey
Insp. Lestrade
Vernon Downing
Norman Locke
Alec Craig
Radlik
Arthur Hohl
Adam Gilflower
Mary Gordon
Mrs. Hudson
Teddy Infuhr
Larry (uncredited)
Donald Stuart
Artie - Shooting Gallery Attendant (uncredited)
Harry Cording
Fred Garvin (uncredited)
Belle Mitchell
Fortune Teller (uncredited)
Angelo Rossitto
Obongo - Pygmy (uncredited)
Sylvia Andrew
Charwoman (uncredited)
Marie De Becker
Charwoman (uncredited)
Jimmy Aubrey
News Vendor (uncredited)
Brandon Beach
Carnival Patron (uncredited)
Frank Benson
Toy Doll Attendant (uncredited)
Lydia Bilbrook
Susan (uncredited)
John Burton
Radio Announcer (uncredited)
James Carlisle
Casino Patron (uncredited)
Jack Deery
Casino Patron (uncredited)
George Kirby
News Vendor (uncredited)
Stanley Logan
Robert (uncredited)
Wilbur Mack
Casino Patron (uncredited)
Edmund Mortimer
Casino Patron (uncredited)
William H. O'Brien
Doorman (uncredited)
John Roche
Casino Croupier (uncredited)
Gene Roth
Henchman Taylor (uncredited)
Arthur Stenning
Plainclothesman (uncredited)
Florence Wix
Casino Patron (uncredited)
Herschel Graham
Casino Patron (uncredited)
Ethelreda Leopold
Casino Patron (uncredited)
Bertram Millhauser
Screenplay
Russell A. Gausman
Set Decoration
Vera West
Costume Design
William Austin
Editor
Martin Obzina
Art Direction
Roy William Neill
Director
Roy William Neill
Producer
John B. Goodman
Art Direction
Charles Van Enger
Director of Photography
Edward R. Robinson
Set Decoration
Bernard B. Brown
Sound Director
Hans J. Salter
Music Director
Arthur Conan Doyle
Story