A darkly festive tale of a yuletide ghoul reveals an irreverently twisted side to the holiday. The horror-comedy tells the story of young Max, who turns his back on Christmas as his dysfunctional family comes together and comically clashes over the holidays. When they accidentally unleash the wrath of Krampus, an ancient entity from European folklore, all hell breaks loose and beloved holiday icons take on a monstrous life of their own.