Robot Monster (a.k.a. Monster from Mars) is a 1953 independently made American black-and-white 3D science fiction film, produced and directed by Phil Tucker, written by Wyott Ordung, that stars George Nader, Claudia Barrett, and George Barrows. The production company was Three Dimension Pictures, Inc. The film was distributed by Astor Pictures.
Robot Monster tells the story of Moon robot Ro-Man's mission to Earth to destroy humanity. He manages to kill all but eight survivors, who have become immune to his death ray. Ro-Man runs afoul of the Great Guidance, his leader, when he becomes attracted to the human Alice. She is the eldest daughter of a surviving scientist, and he refuses to harm her. The Great Guidance must now finish what the Moon robot started.