Out trick-or-treating, the Beavers fog up to that scary house on the hill. In an unbelievable stroke of luck, it turns out to be the home of their B-movie star hero, Oxnard Montalvo. Their happiness is short-lived, however, when they discover the place is being taken over by a glowing space object that thrusst them into a wild ""movie"" that combines bits of every bad B&W sci-fi film that Oxnard ever made. In true B-movie fashion, it's up to the Beavers to defeat the monsters and return everything to normal.