After discovering an ancient sheet music, a teenager and his friends form a metal band to summon a powerful demon to fight against an evil force taking over their town. They must navigate through a series of demonic possessions, gore, and bloody battles to save themselves and their loved ones.

After failing to reform his heavy metal band DEATHGASM for a battle-of-the-bands to win back his girlfriend Medina, Brodie decides to use black magic to raise his ex-band members Zakk and Dion from the dead. However, his resurrected friends become unpredictable and dangerous, leading to chaos in the town.