On Christmas Eve, a scorned widow casts an ancient spell to resurrect her executed husband. However, when the spell goes wrong, the husband is brought back as an Evil Christmas Tree. Hell-bent on getting revenge on the one who caused his execution, the body count keeps rising as the Tree hunts her down.
When his dysfunctional family clashes over the holidays, young Max is disillusioned and turns his back on Christmas. Little does he know, this lack of festive spirit has unleashed the wrath of Krampus: a demonic force of ancient evil intent on punishing non-believers.