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