A salvage crew finds a relic box on an abandoned ship. Opening it unleashes Krampus, an ancient predator now stalking their vessel. With the creature picking them off, the crew races to decode the relic's origins before their mission-and their lives-are swallowed by the darkness they unleashed.

An estranged family are brought together for a final reunion at the old family home for Christmas. They quickly find themselves at the mercy of a nightmarish entity from the past.