Douglas Wilmer

as Decimus

as Fanning

as Pelias

as Judge

as Moutamin

as Henri LaFarge

as The Black Knight

as Major General Francis de Guingand

as Niger

as Headmaster

as Sherlock Holmes

as Arthur de Varville

as Diogones Gent

as Alan Uttershaw

as Henry Wild

as Lord Germain

as Commissioner Dixon

as Steinitz

as Prof. Van Dusen

as Dr. Ward / Dr. Brünner

as Commander Whiting

as Dr. Lowton