In a small town about to host a major music festival, a risky new party drug begins to spread among the young locals. The drug promises exhilarating highs but includes such unfortunate side effects as uncontrollable rage, overwhelming strength and a sudden craving for human flesh. As this all plays out, best friends Jules and Rory get ready for their punk band to perform its first high-profile gig while navigating the town that is now swarming with flesh-eating demons.