In a world where nobody wears a bra and everyone makes sure you can tell they aren’t wearing a bra, single mother Maddy Simmons (Louise Lasser) and her boyfriend (Bill Cakmis) go along to a drive-in performance of an R-rated horror movie – with Maddy’s twin 11-years-ish-old sons, Terry and Todd, sleeping in the back. In the middle of the movie, the twins wake up and Terry finds himself a nice, sharp axe, hacks up a dude in another car, and then hands over the axe to Todd and smears him with blood to frame him. Ten years later, at Thanksgiving dinner Maddy announces that she’s gotten engaged to new squeeze Brad King (William Fuller), manager of the Shadow Wood lakeside housing development where they live, and receives the news that Todd (played as an adult by Mark Soper) has escaped from the special school they sent him to – but not before regaining his memories of that night and telling his therapist, Doctor Berman, the truth about the events.
Well, Terry (also played as an adult by Mark) isn’t having any of that, and he’s decided that a good old-fashioned killing spree is just what’s called for: after all, the more over-the-top, gruesome killings he can pull off tonight and pin on Todd, the longer Todd will be put away for and the better chance Terry will have of getting away with the original murder. With Todd making his way home and much confusion between the twins ensuing, the scene is set for a sort of slasher movie take on The Comedy of Errors. Can Todd get anyone to believe him – and can Terry really get away with his terrible scheme? Will everyone keep their cool, or will someone end up losing their temper and flying into a… Blood Rage?