While at first Arthur thought it was going to be a perfect Christmas, he's not so sure anymore. It hasn't snowed, the tree is decorated with trolls and unicorns, Dad decides to make an authentic "ancient" Christmas dinner, and Arthur accidentally breaks his gift for Mom. While Francine happily celebrates Hanukkah, Brian prepares for Kwanzaa, and Buster tries to find a holiday of his own, Arthur starts to think he'll have a terrible Christmas--until...