Director: Dean DeBlois.
On a distant island inhabited by a warlike tribe. In the harsh conditions of the northern lands, the Vikings are trying to survive, leading an implacable battle with the neighboring flying monsters. Experienced warriors teach their offspring to successfully hunt flying lizards and raid their neighbors' lairs, trying to eradicate their reproduction. One day, the chief's son manages to tame the dragon and turn it into an obedient and friendly creature. Following the example of a brave teenager, tribesmen master the simple science of training winged pets, creating a real squadron capable of covering vast distances and observing the approach of enemies from a height.
Hiccup becomes the recognized leader who has managed to reconcile the two warring camps. But suddenly he begins to notice that the dragon population is thinning, which causes anxiety in the soul of a young hero who decided to understand the situation. He again goes to the wilds, overcoming new challenges and going into adventures full of dangers and discoveries.