Kenneth Drake
Inspector Herbert Saunders
Edgar Ferrell (1 episode)
Horace Selkirk (1 episode)
Dr. James Brady
Sugar Daddy
Neil Frazer
Insp. D.N. Hedges
Harrington
Lord Bonnivet
Sir Edward Scott
Sir Henry Clinton
Duc de Latour
Tobiah
Dr. Frobisher (1 episode)
Dean Cosgrove (1 episode)
Owen Vail (1 episode)
General Melville
Dr. Henry Giraud
Col. Tucker
John H. Tunstall
Signor Alberto Di Gambetta
Cavenly, advisor to Prince James
Professor Banning
Col. Heisler
Lord Robert Clive
Mr. Stryver
Sidney Wallace
John Kolvac
Colonel (uncredited)
Edmond Dureau
John Carver
Jeremy Smithers
Sir Guy de Claremont
Inspector Stoddard
Lt. Col. Caesar von Hofaker
Klaas Van Gelder
Dr. James Brady
Edmond de Maletroit
Roland Paul
Todd Williams
Richelieu
Two-to-One Thompson
Hagen
Sir Giles
Col. Eric Thorne
Marquis D'Andervilliers
Dr. Blucher
Dr. Menzies
Sir John Sedley
Rick Barrett
Dr. Berwick (uncredited)
Victor Kranish
Victor Wright
Clive Russell
Jeffrey Caldwell
Bart McClelland
Rogers
Sir George Fenwick
Simon Merrivale
Dr. Henry Latimer
Mr. Selworth
Roger Pelham
Lord Penrose
Sheik Ahmid Bel Nor
Dr. Dorn
John 'Jack' Shagrue
Sir James Patridge
Cmdr. Charles Brennan
John Crispin
Group Captain
Capt. Duncan MacNeil-Fraser
Joseph 'Joe' Reynolds
Cap Rawlston
Max Armand
Bill Rodgers
John R. Banton
Mr. Franklin Cooper
English Eddie Morton
John Morley
Inspector Gary
Charlie Cortland
Martin Deering
Count Peter Alvinczy
Robert Godfrey
Edward Carrington
Leonard Crecy
Lavassor
Max Bernard, a.k.a. Sir Nigel Crane
Alvin Ritchie
Martin Arlington
Governor Dick Crawford
Thomas MacDonald
Wylie Thornton
Prince Keri of Zalgar
Ronnie Sanderson
Gray Meredith
Major Hugo Beresford
Captain Wolke
Henry - Earl of Kerhill
Robert Maury
Reginald Armstrong
Sir Wilfred Drake
Ronald Killkerry
Grand Duke Paul
Capt. Orloff
Dave Stewart
Chamberlin Jarvis
Prince of Savonia
Lenane