Trailer
Cast
Robert H. Harris
Prof. Frank Allerton
Alexander Lockwood
Arthur Kelvaney
Than Wyenn
Prof. Zeller
Gary Vinson
Young soldier (uncredited)
Robby the Robot
Robby
Gage Clarke
Dr. Bannerman
Rayford Barnes
Capt. McLaren (uncredited)
Helen Kleeb
Miss Vandergrift (uncredited)
Marvin Miller
Robby the Robot (voice) (uncredited)
Richard Eyer
Timmie Merrinoe
Philip Abbott
Dr. Tom Merrinoe
Diane Brewster
Mary Merrinoe
Harold J. Stone
Gen. Swayne
Ralph Votrian
1st Gate Sergeant
Michael Miller
2nd Gate Sergeant
Alvy Moore
Scientist (uncredited)