Coop buys a cartridge from a garage sale, thinking it's a video game. In reality, it's an interdimensional prison for the galaxy's most dangerous criminals-the most dangerous of which is Grrkek The Planet Killer. So, naturally, Coop unleashes Grrkek first, but is able to beat him with a cool looking laser that traps Grrkek. However, he proceeds to unleash all the other prisoners (including one that looks like a robotic Gamera), which show their gratitude by trying to destroy the city. Naturally, Coop must clean up another one of his own series of messes.