Wilton Knight
Wilton Knight (1 episode)
Stan Ellis (1 episode)
Modern-Day Narrator (voice, uncredited) (2 episodes)
Johnny Hyde
Vladimir Skrapinov
Duke of Kentland
Manny Benchly
Matt Kinsella (2 episodes)
Colonel Flint (2 episodes)
Sayer of the Law
John Cutler
Elliott Osborn
Willy Brandt
Dr. Leonard Chaney
Dr. Joshua Henderson (1871)
Bishop Tim Farrow (1 episode)
Narrator (voice) (1 episode)
George Latimer
Woodrow Wilson
Professor Andrew Kirkcastle (1 episode)
Reece Sutton (1 episode)
Carl Brenner
Schiller
Murdock (1 episode)
Dr Douglas Pruitt
Nicholas Framer (1 episode)
Dr. Roy Caldwell
Angus Keough
Nye Buell
Maj. Barney Caldwell
Robert Barnes
The President
Host / Narrator
Captain Aron Sligo (1 episode)
Prof. Theodore Rye (1 episode)
Noel Seymour (1 episode)
Henry Wirz
Brig. Gen. Russell Hamner
Dr. Boeker
Dr. Gregor Hoffman
Adm. Harriman Nelson (110 episodes)
Ah Min
Adam Cook (1 episode)
Capt. Steiner (2 episodes)
Lester Bergson (1 episode)
Philip Townsend (1 episode)
Miles Crawford (1 episode)
Adolf Hitler
Tod Stone (1 episode)
Steve Fallon
Don Benton
Conway (1 episode)
General Washington (1 episode)
Father Phelan
Howard Mason
Martin Lambert
Eric Reinhardt
George Rancourt
Wittkuhn
David Manning (1 episode)
Paolo Martelli
Ivan Karamazov
Maj. Harry Cargill
Matt Donovan (2 episodes)
Martino
Lionel Amblin
Ishmael
Reginald 'Reggie' Wilson
Joe Blake
Carlo
Ing. Stefano Manfredi
Il conte Jacques de Maudy
Larry Kendall
Il 'Matto'
Doctor Stefano Luprandi
Joe Halsey
Joe Hamstringer
George S. Headley
Lt. Dick Rennick
Cpl. Denno
Alan Spender
Robert Cosick
Larry Nelson
Warren Quimby
Maximilian Robespierre
Mounts Hatfield
Roy Martin / Roy Morgan
James Caldwell Demarest
William Williams