Shepperd Strudwick

as Prof. Warren

as Secretary of the Navy

as Mr. Stillwell

as Tersh Jeterax

as Dr. Henry L. Carlyle

as Lycon

as Adrian Benedict

as Self - Narrator (voice)

as Dr. Wells

as Reagan

as James McCullough / Ralph Graham

as Major General Vanderlip

as Dr. Bernard Fischer

as Charley Potter

as Sherman Wadsworth

as Jonathan Wilson

as Dr. Malcolm Couzzens

as Dr. Brooks

as Anthony Vickers

as Milo Bragg

as Jameson

as Timothy Bryant

as Arthur Evans

as Napoleon Bonaparte (uncredited) (voice)

as Mr. Fred Tiflin

as Adam Stanton

as Ted Darby

as Blacky Franchot

as Marchese Del Laudi

as Father Massieu, Joan's Bailiff

as Brig. Gen. Mel Gilbert

as Mr. Wallace Sanford

as Earl Huber aka Mathews

as Lt. Aleksa Petrovic, Mihailovitch's Aide

as Dr. Larry Forbes

as Tod Fenwick

as Henry Clay

as Edgar Allan Poe

as Roger Chevis

as Ed Shirley

as Dewey Roberts

as Bob Mallory

as Dr. Morton

as Dr. Joseph Goldberger

as Lieut. Jerry Banning

as Dr. Gregory 'Greg' Lane

as Dr. John 'Jock' McWade

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

as Ned Morgan

as Joaquin Murrieta

as Dr. Semmelweis

as Rudolph Dimrose

as Dr. Witherton

as Douglas Kilburn

as Bill Mowry

as Peter Selden

as Stanley Sidney

as Dr. Morris

as Dillon Brent

as Self - Nominee

as David

as Reagan

as Doc

as Lycon

as Elliott Simpson