Sherlock Holmes
Dr. Watson
Adrea Spedding
Lestrade
Norman Locke
Radlik
Gilflower
Mrs. Hudson
News Vendor (uncredited)
Carnival Patron (uncredited)
Toy Doll Attendant (uncredited)
Susan (uncredited)
Radio Announcer (uncredited)
Casino Patron (uncredited)
Fred Garvin (uncredited)
Larry (uncredited)
Robert (uncredited)
Carnival Barker (uncredited)
Fortune Teller (uncredited)
Doorman (uncredited)
Casino Croupier (uncredited)
Obongo - Pygmy (uncredited)
Henchman Taylor (uncredited)
Plainclothesman (uncredited)
Artie - Shooting Gallery Attendant (uncredited)