Basil Rathbone Sherlock Holmes Nigel Bruce Dr. John H. Watson Patricia Morison Mrs. Hilda Courtney Frederick Worlock Colonel Cavanaugh Harry Cording Hamid Carl Harbord Inspector Hopkins Holmes Herbert Ebenezer Crabtree Edmund Breon Julian 'Stinky' Emery Patricia Cameron Evelyn Clifford Mary Gordon Mrs. Hudson Ian Wolfe Commissioner of Scotland Yard Leyland Hodgson Tour Guide Marjorie Bennett Antique Shop Assistant (uncredited) William H. O'Brien Detective at Murder Scene Frank Baker Photographer Sally Shepherd Actor Wallace Scott Joe Cisto Jack Curtis Pub Patron (uncredited) Cyril Delevanti Convict at Dartmoor Prison (uncredited) Charlie Hall Cab Driver (uncredited) Roy William Neill Director Maury Gertsman Director