A punk scientist formed the formula of the deadly drink that transforms drunks into hallucinated zombies and awakens the fury of Little Red Riding Hood's grandmother and her afternoon tea buddies, who armed and dangerous decide to get revenge.

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.

Three cannibal brothers are visited by their cousins and see a great gastronomic opportunity.

Dr. Karloff prisons an alien from the Leguminous Planet and calls his friend Dr. Marins to help him in his experiences, because the Leguminous Monster is an anarchist intellectual full of hate against the human beings. While the scientists discuss about the monster, Caquinha is convinced for him to let him go. Done that, the Monster kills the scientists and kills everyone he finds in his way.