Timmie Merrinoe

Richard Eyer

Acting

Dr. Tom Merrinoe

Philip Abbott

Acting

Mary Merrinoe

Diane Brewster

Acting

Gen. Swayne

Harold J. Stone

Acting

Prof. Frank Allerton

Robert H. Harris

Acting

Col. Macklin

Dennis McCarthy

Acting

Arthur Kelvaney

Alexander Lockwood

Acting

Prof. Baine

John O'Malley

Acting

Dr. Bannerman

Gage Clarke

Acting

Prof. Zeller

Than Wyenn

Acting

Prof. Foster

Jefferson Dudley Searles

Acting

Martin / Computer

Alfred Linder

Acting

1st Gate Sergeant

Ralph Votrian

Acting

2nd Gate Sergeant

Michael Miller

Acting

Capt. McLaren (uncredited)

Rayford Barnes

Acting

Miss Vandergrift (uncredited)

Helen Kleeb

Acting

Scientist (uncredited)

Alvy Moore

Acting

Young soldier (uncredited)

Gary Vinson

Acting

Robby the Robot (voice) (uncredited)

Marvin Miller

Acting