Clive Brook

as Marquis of Gleneyre

as George, 10th Duke of Bristol, Director, Adaptation, Producer

as Leslie Pagan

as Maj. Lessart

as Peter Conroy

as Dr. Karl Roder

as Captain Tom Armitage

as Robert Maine / Manning

as Sir Hubert Ware

as Ann Daviot

as King Regis VI

as Malcolm Stevenson

as Bill Trent

as Dr. Struensee

as Jack

as Latimer

as Dan Pritchard

as Gordon Evers

as Colin Grant

as Robert Marryot

as Sherlock Holmes

as John Curry

as Clive Brook (uncredited)

as Captain Tony Clyde