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Basil Rathbone Sherlock Holmes

Nigel Bruce Dr. John Watson

Hillary Brooke Lydia Marlowe

Henry Daniell Professor James Moriarty

Paul Cavanagh Sir George Fenwick

Matthew Boulton Inspector Gregson

Eve Amber Maude Fenwick

Frederick Worlock Dr. Onslow

Percival Vivian Dr. Simnell

Coulter Irwin Corporal Williams

Sally Shepherd Crandon

Mary Gordon Mrs. Hudson

John Burton Waring the Mesmerist (uncredited)

Harold De Becker Shoelace Vendor Henchman (uncredited)

Tony Ellis Carter the Hypnotized Subject (uncredited)

Bess Flowers Bar Patron (seen in mirror) (uncredited)