Arthur Hohl
Henchman Bassick
Frank Dawson
Dawes, Moriarty's servant
E. E. Clive
Inspector Bristol
Terry Kilburn
Billy
Mary Gordon
Mrs. Hudson
Anthony Kemble-Cooper
Tony Conyngham (as Anthony Kemble Cooper)
Peter Willes
Lloyd Brandon
George Regas
Henchman Mateo
May Beatty
Mrs. Jameson, Brandon Housekeeper
Mary Forbes
Lady Conyngham
Holmes Herbert
Justice of the Court
Leonard Mudie
Barrows - Moriarty's Attorney (uncredited)
Robert Nobel
Foreman of the Jury (uncredited)
Ivan F. Simpson
Gates - Trial Prosecutor (uncredited)
Neil Fitzgerald
Clerk of the Court (uncredited)
Frank Baker
Tompkins (uncredited)
Denis Greene
Denis Green (uncredited)
Robert Cory
Tower Sentry (uncredited)
Gordon Hart
Guard (uncredited)
Keith Hitchcock
Constable (uncredited)
Ivo Henderson
Bobby (uncredited)
Leyland Hodgson
Bobby (uncredited)
Boyd Irwin
Bobby (uncredited)
Charles Irwin
Marine Sergeant (uncredited)
Robert R. Stephenson
Cabby (uncredited)
Harry Cording
Second Fake Constable (uncredited)
Eric Wilton
Conyngham Butler (uncredited)
William Austin
Inquisitive Stranger
Frank Benson
Cockney (uncredited)
Ted Billings
Pub Customer (uncredited)