FRANKENSTEIN MEETS THE SPACEMONSTER

The film tells the story of a facially-damaged android robot who fights alien invaders. Despite the title, neither Dr. Frankenstein nor Frankenstein's monster appear in the film. However, it is stated near the beginning of the movie that the android is partially built from human pieces and he is also often called by the first name of Frank.

All of the women on the planet Mars have died in an atomic war, except for Martian Princess Marcuzan (Marilyn Hanold). Marcuzan and her right-hand man, Dr. Nadir (Lou Cutell), decide they will travel to Earth and steal all of the women on the planet in order to continue the Martian race. The Martians shoot down a space capsule manned by the android astronaut Colonel Frank Saunders (Robert Reilly), causing it to crash land in Puerto Rico. Frank's electronic brain and the left half of his face are damaged after encountering a trigger-happy Martian and his ray gun. Frank, now the "Frankenstein" of the title, described by his creator as an "astro-robot without a control system", proceeds to terrorize the island. A subplot involves the Martians abducting beautiful bikini-clad women for the purpose of breeding.

The "Space Monster" of the title refers to a radiation-scarred mutant named Mull brought along as part of the Martian invasion force. The "Frankenstein" android and Mull battle each other at the end of the film and both are destroyed.