Across the world we called home stood five great kingdoms. Corona, the sunlit realm of Tangled; the Greater Archipelago of the How to Train Your Dragon lands; the icy Kingdom of the North from Rise of the Guardians; the rugged Kingdom of DunBroch from Brave; and the enchanted Kingdom of Arendelle from Frozen. While many other realms existed, these five were the most prominent — bound together by a strong alliance.
Every year, the five allied kingdoms gather for the annual Treaty Festival, a grand celebration hosted by one of the realms to renew their bonds of friendship and alliance. This year, the festival is being held in the sunny kingdom of Corona, arranged by the royal parents of the heirs. What began as formal diplomatic meetings between the kingdoms has evolved into a lively gathering where the young princes and princesses — Rapunzel, Eugene, Jack, Merida, Hiccup, Anna, Elsa, and the rest of their friends — get to reunite, compete in games, share adventures, and strengthen the ties between their very different worlds.