Trailer
Images
 | Basil Rathbone as Sherlock Holmes |
 | Nigel Bruce as Dr. Watson |
 | George Zucco as Professor Moriarty |
 | Ida Lupino as Ann Brandon |
 | Alan Marshal as Jerrold Hunter |
 | Henry Stephenson as Sir Ronald Ramsgate |
 | Arthur Hohl as Henchman Bassick |
 | Frank Dawson as Dawes, Moriarty's servant |
 | E. E. Clive as Inspector Bristol |
 | Terry Kilburn as Billy |
 | Mary Gordon as Mrs. Hudson |
| Anthony Kemble-Cooper as Tony Conyngham (as Anthony Kemble Cooper) |
| Peter Willes as Lloyd Brandon |
 | George Regas as Henchman Mateo |
 | May Beatty as Mrs. Jameson, Brandon Housekeeper |
 | Mary Forbes as Lady Conyngham |
 | Holmes Herbert as Justice of the Court |
 | Leonard Mudie as Barrows - Moriarty's Attorney (uncredited) |
| Robert Nobel as Foreman of the Jury (uncredited) |
 | Ivan F. Simpson as Gates - Trial Prosecutor (uncredited) |
| Neil Fitzgerald as Clerk of the Court (uncredited) |
 | Frank Baker as Tompkins (uncredited) |
| Denis Greene as Denis Green (uncredited) |
| Robert Cory as Tower Sentry (uncredited) |
| Gordon Hart as Guard (uncredited) |
| Keith Hitchcock as Constable (uncredited) |
| Ivo Henderson as Bobby (uncredited) |
 | Leyland Hodgson as Bobby (uncredited) |
| Boyd Irwin as Bobby (uncredited) |
| Charles Irwin as Marine Sergeant (uncredited) |
| Robert R. Stephenson as Cabby (uncredited) |
 | Harry Cording as Second Fake Constable (uncredited) |
| Eric Wilton as Conyngham Butler (uncredited) |
 | William Austin as Inquisitive Stranger |
| Frank Benson as Cockney (uncredited) |
| Ted Billings as Pub Customer (uncredited) |
| Production | |
| Darryl F. Zanuck | Producer |
Art | |
| Richard Day | Art Direction |
| Thomas Little | Set Decoration |
Costume & Make-Up | |
| Gwen Wakeling | Costume Design |
Writing | |
| Edwin Blum | Screenplay |
Camera | |
| Leon Shamroy | Director of Photography |
Writing | |
| Arthur Conan Doyle | Characters |
Art | |
| Hans Peters | Art Direction |
Directing | |
| Alfred L. Werker | Director |
Writing | |
| William Gillette | Theatre Play |
Production | |
| Gene Markey | Associate Producer |
Editing | |
| Robert Bischoff | Editor |
Writing | |
| William Absalom Drake | Screenplay |
