FRANKENSTEIN MEETS THE SPACEMONSTER

All of the women on the planet Mars have died in an atomic war, except for Martian Princess Marcuzan (Marilyn Hanold). Marcuzan (evidently unwilling or unable to conceive) 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 carrying 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. The android and a radiation-scarred mutant named Mull, part of the invasion force, battle each other, and both are destroyed.

The android 'Frank' battles the Martian mutant Mull, and both are destroyed, ending the Martian threat.

The destruction of both Frank and the Martian mutant marks the end of the Martian invasion and the android's rampage. With the main threats neutralized, the film concludes its tale of atomic-age anxieties with a decisive clash between synthetic and alien forces, playing out the consequences of unchecked science and interplanetary desperation.