Earle Williams

as Horace Howard

as Mary Callahan

as Mr. Black

as Sir Henry Weymouth

as William Dvorak

as Victor Brandt

as The Adventurer

as Major Desmond

as Sgt. Neil Tempest

as Lt. Breen

as Eddie Manning

as Capt. Robert Kent

as Anthony Trent

as Leonard Staunton

as Captain Swift

as Ashe Colvin

as Jules Marin / M. Picard

as John Leighton

as James Maddox

as John Paget / Richard Paget

as Hawtrey Burke

as James Armitage

as Dr. Hugh Loring

as Dr. Ordway Brandt

as Stephen Page

as Geoffrey Wynne

as Robert Travers

as Stanley Ormsby

as Arsene Lupin

as Lieutenant Francis Burnham

as Tom Barclay

as John Ballard

as Sacha

as Brother John Storm

as John Hawley

as Henry

as Sherman Avery

as Cyril - Son of the Earl of Creston

as Lt. Oscar Mulbach, a German Spy

as Dr. Howard Baldwin

as Lester - A Swindler

as One of the Beecham Brothers

as The King's Jester

as Lieutenant Wentworth