William Dvorak
Mr. Black
Capt. Robert Kent
Sgt. Neil Tempest
Marcus Brutus
Sir Henry Weymouth
Jules Marin / M. Picard
Dr. Hugh Loring
James Armitage
Horace Howard
Eddie Manning
Yale Durant
Tom Barclay
Anthony Trent
Lieutenant Bruce
John Wilbur
Dr. Ordway Brandt
Walter P. Cross - Minister of Foreign Affairs
Robert Travers
John Hawley
Arsene Lupin
Victor Brandt
Mary Callahan
John Ballard
Brother John Storm
Matthew
Dr. Howard Baldwin
The Adventurer
Leonard Staunton
Sacha
Stephen Page
John Leighton
John Ruskin
Jack
Major Desmond
Sherman Avery
Lieutenant Francis Burnham
Willie's Room-Mate
John Richardson
John Paget / Richard Paget
Dr. Ferguson
The King's Jester
Jack Courtney
Lord Francis Towne
Lt. Oscar Mulbach, a German Spy
Lester - A Swindler
Ashe Colvin
Dick Livingston
Cyril - Son of the Earl of Creston
Lieutenant Wentworth
Captain Jack Myers
Henry
Geoffrey Wynne
George Pinckney
Stanley Ormsby
Harry Faulkner
Christopher Race
One of the Beecham Brothers
Walter Brown, a Young Politician
Hawtrey Burke
Captain Swift
Lydia's Sweetheart, Paul
Lt. Breen
Richard Lawrence - the General's Son