Richard Eyer
Timmie Merrinoe
Philip Abbott
Dr. Tom Merrinoe
Diane Brewster
Mary Merrinoe
Harold J. Stone
Gen. Swayne
Robert H. Harris
Prof. Frank Allerton
Dennis McCarthy
Col. Macklin
Alexander Lockwood
Arthur Kelvaney
Jefferson Dudley Searles
Prof. Foster
Alfred Linder
Martin / Computer
Ralph Votrian
1st Gate Sergeant
Michael Miller
2nd Gate Sergeant
Rayford Barnes
Capt. McLaren (uncredited)
Helen Kleeb
Miss Vandergrift (uncredited)
Alvy Moore
Scientist (uncredited)
Gary Vinson
Young soldier (uncredited)
Marvin Miller
Robby the Robot (voice) (uncredited)
