Berk's town , now enjoying its alliance is currently preparing for the yearly winter holiday of Snoggletog. When the dragons, except Toothless who needs Hiccup to help him fly away for a certain reason, that soul is threatened. While Astrid ineffectually attempts to overthrow the event, Hiccup makes the decision to develop a new prosthetic to let him fly independently, simply to own the dragon take off as well to Toothless. As the holiday approaches, Hiccup finds himself swept around understand the dragons' secret the tough way also to find a way to create them home.