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.

Hiccup, Toothless and a mysterious dragon rider join forces to protect the island of Berk from a power-hungry warrior with a dragon army of his own.

Shy teen Hiccup must prove to his father and his village that he can still be a Viking warrior — even if he'd rather befriend a dragon than slay one.