Time-travel trickery? Humorous holiday horrors? It's a Christmas Calamity! Between the zombie reindeer, an ultimatum from Father Time, an impending dinopocalypse, and the emergence of an ancient evil, Santa Clause can't catch a break. Worst. Christmas. Ever. But Santa isn't alone. With help from an alcoholic rocket-scientist Christmas elf, Santa fights back, determined to save Christmas. But can he do it before these threats ruin Christmas-and destroy the world-forever?