A bunch of adventurous kids stumble upon a drum housing a decaying body, inadvertently unleashing the deadly 2-4-5 Trioxin gas. This toxic mist revives the dead, leading to a chaotic outbreak as the reanimated corpses roam the streets in search of brains. As panic spreads, the group must band together to confront the undead menace and find a way to stop the relentless tide of flesh-eating zombies before their small town is overrun.