The Invisible Boy

Richard Eyer

as Timmie Merrinoe

Philip Abbott

as Dr. Tom Merrinoe

Diane Brewster

as Mary Merrinoe

Harold J. Stone

as Gen. Swayne

Robert H. Harris

as Prof. Frank Allerton

Dennis McCarthy

as Col. Macklin

Alexander Lockwood

as Arthur Kelvaney

John O'Malley

as Prof. Baine

Gage Clarke

as Dr. Bannerman

Than Wyenn

as Prof. Zeller

Jefferson Dudley Searles

as Prof. Foster

Alfred Linder

as Martin / Computer

Ralph Votrian

as 1st Gate Sergeant

Michael Miller

as 2nd Gate Sergeant

Rayford Barnes

as Capt. McLaren (uncredited)

Helen Kleeb

as Miss Vandergrift (uncredited)

Alvy Moore

as Scientist (uncredited)

Gary Vinson

as Young soldier (uncredited)

Marvin Miller

as Robby the Robot (voice) (uncredited)