Stephen Holstrom (voice) (8 episodes)
Pere La Chaise
Secretary Ross
Peter Cromwell (1 episode)
Secretary of State Thaddeus Ross
Bob Partridge (10 episodes)
Secretary of State Thaddeus Ross
Ernie Found
Donald Cooperman (14 episodes)
Secretary of State Thaddeus Ross
Jeremiah Mahoney
Dr. George Millican (8 episodes)
Julian Rigby
Julian Rigby
Isaac Penn
Frank Hamer (2 episodes)
Jeb Stryder
Richard Feynman
Henry Paulson
Warren Mills
Thaddeus 'Thunderbolt' Ross (archive footage)
Captain Ahab (4 episodes)
William Marshal
Brett Hanson
György Thurzó
Professor Will Esterhuyse
Daniel Purcell (13 episodes)
General 'Thunderbolt' Ross
President Ashton
Mayor Schneer
Walt McCandless
Marshall
John Davis
Philip Allen
Simon Messerman
David
Stan
Richie Cusack
Dr. Peter Reed
General Mortimer
Professor Waldman (2 episodes)
Edward Walker
Alan Osborne
Robert P. Hanssen
Angus Tuck
Dr. Taber (1 episode)
Doyle's Sponsor
Edward
Prof. Hobby
Varian Fry
Turner Knight
Turner Knight (1 episode)
David R. Whitman
Duke Leto Atreides (3 episodes)
Jairus (voice)
Walter Richmond
Andor Knorr
Greg Harrison
William Blake Pellarin
George Gulden
Prof. John Robinson
Arthur Barret
Inspector Frank Bumstead
K.D. Dietrickson
Frank Quinlan
The stranger
Henry Harriston
Rochester
Paul Benjamin
Graham Holt
Tommy Vesey
Doctor Bernard Rieux
Narrator (voice)
Sam Farber, alias Trevor McPhee
Doug Tate
Steve Mills (voice)
Harlan James
Self - Cameo (uncredited) (1 episode)
Macon Leary
Martin Larraneta
Tom Grunick
James Leeds
Luis Molina
Self - Presenter (3 episodes)
Self - Nominee/Presenter (1 episode)
Arkady Renko
Nick Carlton
Jay Follet
Ned Racine
Daryll Deever
Professor Eddie Jessup
Walter
