Basil Rathbone
Sherlock Holmes
Acting
Nigel Bruce
Dr. John Watson
Acting
Hillary Brooke
Lydia Marlowe
Acting
Henry Daniell
Professor James Moriarty
Acting
Paul Cavanagh
Sir George Fenwick
Acting
Matthew Boulton
Inspector Gregson
Acting
Eve Amber
Maude Fenwick
Acting
Frederick Worlock
Dr. Onslow
Acting
Percival Vivian
Dr. Simnell
Acting
Coulter Irwin
Corporal Williams
Acting
Sally Shepherd
Crandon
Acting
Mary Gordon
Mrs. Hudson
Acting
John Burton
Waring the Mesmerist (uncredited)
Acting
Harold De Becker
Shoelace Vendor Henchman (uncredited)
Acting
Tony Ellis
Carter the Hypnotized Subject (uncredited)
Acting
Bess Flowers
Bar Patron (seen in mirror) (uncredited)
Acting
Kay Harding
4th Victim (uncredited)
Acting
Alec Harford
Commissioner of the CID (uncredited)
Acting
Olaf Hytten
Fenwick's Butler Norris (uncredited)
Acting
Boyd Irwin
Short-Tempered Officer Closing Window (uncredited)
Acting
Eric Mayne
Member of Mesmer Club (uncredited)
Acting
William H. O'Brien
Pembrook House Waiter (uncredited)
Acting