This page about a Christmas special or an episode from a television series with a Christmas theme is in need of a longer synopsis. You can help the Christmas Special Wiki by expanding this synopsis.
On Christmas Eve, Hiro discovers a present that he believes is from Cass. While at school, he mixes his backpack with Fred's by accident and calls him later to check. Fred does not find the present so he, Hiro and Baymax begin searching. The present finds its way through Mole, Globby, Krei's assistant Judy and Krei himself who threw it out. At the junkyard, Noodle Burger Boy finds it and takes it away. It is at this point that Baymax reveals that the present is from Tadashi. The team gets together and discovers that Noodle Burger Boy, El Fuego, Mr. Sparkles, Supersonic Sue and Steamer are having a gift exchange. A fight breaks out over the present with Big Hero 6 winning. Hiro finally opens the present: a miniature snow machine that Tadashi had built with Hiro in the past. The gang use it to make it snow outside for Christmas.