Benedict Arnold
Lincoln Venner
Peter Selden
Dr. Morris
Mac Taylor
Senator Greet
Cassius
Hal Manning
Nordlund
Dr. Witherton
Self - Nominee
Doc
Dr. Giffin
Bert
Father
Stanley Sidney
Douglas Kilburn
Bill Mowry
Reagan
Rudolph Dimrose
Lycon
Elliott Simpson
Father Massieu, Joan's Bailiff
Prof. Warren
Dillon Brent
Napoleon Bonaparte (uncredited) (voice)
Jonathan Wilson
David
Ted Darby
Reagan
Henry Clay
Tersh Jeterax
Sherman Wadsworth
Ed Shirley
Dewey Roberts
Jameson
Brig. Gen. Mel Gilbert
Lycon
Marchese Del Laudi
Major General Vanderlip
Tod Fenwick
Secretary of the Navy
Dr. Semmelweis
Timothy Bryant
Lieut. Jerry Banning
Ned Morgan
Dr. Henry L. Carlyle
Bob Mallory
Mr. Fred Tiflin
Dr. Gregory 'Greg' Lane
Arthur Evans
Dr. Joseph Goldberger
Earl Huber aka Mathews
Dr. Malcolm Couzzens
Edgar Allan Poe
Blacky Franchot
Mr. Stillwell
Dr. John 'Jock' McWade
Anthony Vickers
Adrian Benedict
Dr. Larry Forbes
Milo Bragg
Mr. Wallace Sanford
James McCullough / Ralph Graham
Dr. Morton
Dr. Wells
Adam Stanton
Joaquin Murrieta
Dr. Bernard Fischer
Roger Chevis
Lt. Aleksa Petrovic, Mihailovitch's Aide
Self - Narrator (voice)
Dr. Brooks
Narrator / Tom Thumb's Father (voice) (uncredited)
Charles Francis Adams