It’s been two years since Kate (Darby Camp) and her brother, Teddy Pierce (Judah Lewis), saved Christmas. A lot has changed since then. Kate has meanwhile become a cynical teenager and is now spending her Christmas without much reluctance in Cancun, along with her mother’s new boyfriend and Jack (Jahzir Bruno), his son. Unwilling to accept this family version, Kate decides to run away. But when the magical and mysterious Belsnickel threatens to destroy the North Pole and end Christmas forever, Kate and Jack unexpectedly embark on a new adventure with Santa (Kurt Russell).