Dr. Rottenberg, the greatest Martian scientist, comes to Planet Earth to make preparations for a wild invasion involving re-animated Earth bodies, Martian zombies and teenagers playing in the woods. Criaturas Hediondas is one of the first Brazilian Shot On Video (SOV) to have national distribution via VHS tapes that were marketed in stands at grindcore, death metal and punks shows, becoming a reference (at the time) in the national underground. The video was filmed with a VHS camera and mounted from video to video, in an analog way.

The day after the carnage initiated by the Martian scientist, a fleet of spacecraft from Mars is called upon to invade Earth, but Dr. Rottenberg's plans are hampered by two NASA officials, Detective Johnson and Dr. Nagib, called in to investigate. the case.