Trailer
Images
 | Basil Rathbone as Sherlock Holmes |
 | Nigel Bruce as Dr. John Watson |
 | Hillary Brooke as Lydia Marlowe |
 | Henry Daniell as Professor James Moriarty |
 | Paul Cavanagh as Sir George Fenwick |
 | Matthew Boulton as Inspector Gregson |
 | Eve Amber as Maude Fenwick |
 | Frederick Worlock as Onslow |
 | Coulter Irwin as Corporal Williams |
| Sally Shepherd as Crandon |
 | Mary Gordon as Mrs. Hudson |
 | Billy Bevan as Street Peddler (uncredited) |
| John Burton as Waring the Mesmerist (uncredited) |
| Tony Ellis as Carter the Hypnotized Subject (uncredited) |
 | Bess Flowers as Bar Patron (seen in mirror) (uncredited) |
 | Kay Harding as 4th Victim (uncredited) |
| Alec Harford as Commissioner of the CID (uncredited) |
 | Olaf Hytten as Fenwick's Butler Norris (uncredited) |
| Boyd Irwin as Short-Tempered Officer Closing Window (uncredited) |
 | Eric Mayne as Member of Mesmer Club (uncredited) |
 | William H. O'Brien as Pembrook House Waiter (uncredited) |
| Percival Vivian as Dr. Simnell (uncredited) |
| Production | |
| Roy William Neill | Producer |
Directing | |
| Roy William Neill | Director |
Camera | |
| Virgil Miller | Director of Photography |
Editing | |
| Edward Curtiss | Editor |
Art | |
| John B. Goodman | Art Direction |
| Russell A. Gausman | Set Decoration |
Crew | |
| John P. Fulton | Special Effects |
Costume & Make-Up | |
| Vera West | Costume Design |
Sound | |
| Bernard B. Brown | Sound Director |
Art | |
| Ted von Hemert | Set Decoration |
Sound | |
| Mark Levant | Music Director |
Art | |
| Martin Obzina | Art Direction |
Writing | |
| Bertram Millhauser | Screenplay |
| Arthur Conan Doyle | Characters |
Camera | |
| Roswell A. Hoffmann | Camera Operator |
