When Hiccup discovers Toothless isn't the only Night Fury, he must seek the Hidden World, a secret Dragon Utopia before a hired tyrant named Grimmel finds it first.When Hiccup discovers Toothless isn't the only Night Fury, he must seek the Hidden World, a secret Dragon Utopia before a hired tyrant named Grimmel finds it first.When Hiccup discovers Toothless isn't the only Night Fury, he must seek the Hidden World, a secret Dragon Utopia before a hired tyrant named Grimmel finds it first.