Self - Nominee (1 episode)

Prof. Warren

(2 episodes)

Secretary of the Navy

Rudolph Dimrose (1 episode)

Dr. Witherton (1 episode)

Tersh Jeterax

Mr. Stillwell

Dr. Henry L. Carlyle

Lycon (1 episode)

Lycon

(277 episodes)

Adrian Benedict

Bill Mowry (1 episode)

Douglas Kilburn (1 episode)

Peter Selden (1 episode)

Stanley Sidney (1 episode)

Dr. Wells

(1 episode)

James McCullough / Ralph Graham

(1 episode)

Elliott Simpson (1 episode)

Dillon Brent (1 episode)

Dr. Morris (1 episode)

Reagan (1 episode)

Reagan

Major General Vanderlip

Dr. Bernard Fischer

Charley Potter

David (1 episode)

Jonathan Wilson

Dr. Malcolm Couzzens

Doc (1 episode)

Dr. Giffin (1 episode)

Bert (1 episode)

Father (1 episode)

Sherman Wadsworth

(1 episode)

Charles Francis Adams (1 episode)

Dr. Brooks

(1 episode)

(1 episode)

(3 episodes)

Mac Taylor (1 episode)

Senator Greet (1 episode)

Cassius (1 episode)

Hal Manning (1 episode)

Nordlund (1 episode)

(219 episodes)

Anthony Vickers

Milo Bragg

Timothy Bryant

Arthur Evans

(2 episodes)

Benedict Arnold (1 episode)

Lincoln Venner (1 episode)

Jameson

Ted Darby

Adam Stanton

Blacky Franchot

Napoleon Bonaparte (uncredited) (voice)

Mr. Fred Tiflin

Marchese Del Laudi

Father Massieu, Joan's Bailiff

Brig. Gen. Mel Gilbert

Mr. Wallace Sanford

Earl Huber aka Mathews

Lt. Aleksa Petrovic, Mihailovitch's Aide

Dr. Larry Forbes

Edgar Allan Poe

Henry Clay

Tod Fenwick

Dewey Roberts

Bob Mallory

Roger Chevis

Ed Shirley

Dr. Morton

Lieut. Jerry Banning

Dr. Joseph Goldberger

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

Dr. Gregory 'Greg' Lane

Dr. John 'Jock' McWade

Ned Morgan

Joaquin Murrieta

Dr. Semmelweis