Plot: Three days before Christmas, the prosperous but dysfunctional Engel family gathers for Christmas. Max remains a firm believer in Santa Claus, and intends to send him a letter. on sending a letter to him. In his family are his parents Tom and Sarah; his teenage sister Beth; his aunt Linda and uncle Howard; their children Howie Jr., Stevie, Jordan, and baby Chrissie; Sarah and Linda's cantankerous aunt Dorothy; and Tom's mother Omi, who speaks mostly in German. Max wants to continue family traditions, but tension between his relatives leads to them losing their Christmas spirit.
Alternative Plot: While the holiday season represents the most magical time of year, ancient European folklore warns of Krampus, a horned beast who punishes naughty children at Christmastime. When dysfunctional family squabbling causes young Max (Emjay Anthony) to lose his festive spirit, it unleashes the wrath of the fearsome demon. As Krampus lays siege to the Engel home, mom (Toni Collette), pop (Adam Scott), sister (Stefania LaVie Owen) and brother must band together to save one another from a monstrous fate.
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