The unlikely friendship between the young Viking Hiccup, who was raised to believe that dragons must be slayed, and a dangerous and rare dragon, Night Fury.
Hiccup and Toothless embark on an adventure to save their island from a dragon hunter who's bent on taking over the world with a dragon army.
As Hiccup fulfills his dream of creating a peaceful dragon utopia, Toothless' discovery of a wild dragon drives the Night Fury away. When danger mounts, Hiccup's reign as village chief is tested, both dragon and rider must make impossible decisions to save their own kind.