Sherlock Holmes

Basil Rathbone

Acting

Dr. John Watson

Nigel Bruce

Acting

Lydia Marlowe

Hillary Brooke

Acting

Professor James Moriarty

Henry Daniell

Acting

Sir George Fenwick

Paul Cavanagh

Acting

Inspector Gregson

Matthew Boulton

Acting

Maude Fenwick

Eve Amber

Acting

Dr. Onslow

Frederick Worlock

Acting

Dr. Simnell

Percival Vivian

Acting

Corporal Williams

Coulter Irwin

Acting

Crandon

Sally Shepherd

Acting

Mrs. Hudson

Mary Gordon

Acting

Waring the Mesmerist (uncredited)

John Burton

Acting

Shoelace Vendor Henchman (uncredited)

Harold De Becker

Acting

Carter the Hypnotized Subject (uncredited)

Tony Ellis

Acting

Bar Patron (seen in mirror) (uncredited)

Bess Flowers

Acting

4th Victim (uncredited)

Kay Harding

Acting

Commissioner of the CID (uncredited)

Alec Harford

Acting

Fenwick's Butler Norris (uncredited)

Olaf Hytten

Acting

Short-Tempered Officer Closing Window (uncredited)

Boyd Irwin

Acting

Member of Mesmer Club (uncredited)

Eric Mayne

Acting

Pembrook House Waiter (uncredited)

William H. O'Brien

Acting