Roy William Neill Director, Producer Basil Rathbone Sherlock Holmes Actor Nigel Bruce Dr. John H. Watson Actor Alan Mowbray Maj. Duncan-Bleek Actor Dennis Hoey Inspector Lestrade Actor Renee Godfrey Vivian Vedder Actor Mary Forbes Lady Margaret Carstairs Actor Billy Bevan Passenger Car Attendant Actor Frederick Worlock Prof. William Kilbane Actor Leland Hodgson Train Conductor (uncredited) Actor Geoffrey Steele Hon. Roland Carstairs Actor Boyd Davis Inspector MacDonald (uncredited) Actor Janet Murdoch Mrs. Shallcross (uncredited) Actor Skelton Knaggs Sands Actor Gerald Hamer Alfred Shallcross (uncredited) Actor Harry Cording Mock Actor Charles Knight Guard (uncredited) Actor Bobby Wissler Mock's Son (uncredited) Actor Frank Gruber Screenwriter Howard Benedict Executive Producer Maury Gertsman Cinematographer Saul Goodkind Film Editing John B. Goodman Art Director Abraham Grossman Art Director Russell A. Gausman Set Decoration Carl J. Lawrence Set Decoration Vera West Costume Design