One year after becoming chieftain Hiccup, his Night Fury Toothless, and their fellow dragon-riders continue to rescue captured dragons to bring them to Berk and its bustling dragon-human utopia. Their efforts have resulted in the island becoming overpopulated with dragons. In response, Hiccup desires to find the "Hidden World", a safe haven for dragons spoken of by his late father, Stoick. Meanwhile, a white female Fury dragon, held captive by warlords, is given to infamous dragon hunter