Shepperd Strudwick

as Prof. Warren

as Secretary of the Navy

as Rudolph Dimrose

as Tersh Jeterax

as Mr. Stillwell

as Dr. Witherton

as Dr. Henry L. Carlyle

as Lycon

as Adrian Benedict

as Bill Mowry

as Douglas Kilburn

as Dr. Wells

as Self - Narrator (voice)

as Peter Selden

as Stanley Sidney

as James McCullough / Ralph Graham

as Reagan

as Major General Vanderlip

as Dr. Morris

as Dr. Bernard Fischer

as Dillon Brent

as Charley Potter

as David

as Reagan

as Jonathan Wilson

as Dr. Malcolm Couzzens

as Sherman Wadsworth

as Self - Nominee

as Doc

as Dr. Giffin

as Bert

as Father

as Dr. Brooks

as Charles Francis Adams

as Lycon

as Elliott Simpson

as Anthony Vickers

as Milo Bragg

as Timothy Bryant

as Arthur Evans

as Jameson

as Ted Darby

as Adam Stanton

as Blacky Franchot

as Napoleon Bonaparte (uncredited) (voice)

as Mr. Fred Tiflin

as Marchese Del Laudi

as Father Massieu, Joan's Bailiff

as Brig. Gen. Mel Gilbert

as Mac Taylor

as Senator Greet

as Cassius

as Hal Manning

as Nordlund

as Benedict Arnold

as Lincoln Venner

as Mr. Wallace Sanford

as Earl Huber aka Mathews

as Lt. Aleksa Petrovic, Mihailovitch's Aide

as Dr. Larry Forbes

as Edgar Allan Poe

as Henry Clay

as Tod Fenwick

as Dewey Roberts

as Bob Mallory

as Roger Chevis

as Dr. Morton

as Ed Shirley

as Lieut. Jerry Banning

as Dr. Joseph Goldberger

as Narrator / Tom Thumb's Father (voice) (uncredited)

as Dr. Gregory 'Greg' Lane

as Dr. John 'Jock' McWade

as Ned Morgan

as Joaquin Murrieta

as Dr. Semmelweis