Twins Todd and Terry are at a drive-in movie when they find their mom locked in a passionate makeout session with a man they don't know. Terry explodes and kills a teen in a nearby car out of rage — but then pins the whole thing on Todd. Todd's locked up in an asylum while Terry goes about his adolescent life. Ten years later on Thanksgiving Day, Todd escapes the asylum and Terry starts to break down again, going after his mom's current partner. All hell breaks loose when the two of them are on their own murderous rampages.