The adventure comedy is set in the mythical world of burly Vikings and wild dragons, based on the book by Cressida Cowell. The story centers around a Viking teenager, who lives on the island of Berk, where fighting dragons is a way of life. Initiation is coming, and this is his one chance to prove his worthiness to his tribe and father. But when he encounters, and ultimately befriends, an injured dragon, his world is turned upside down.