In the aftermath of the events of the movie, the kids are enjoying their new lives with dragons, but the rest of the villagers aren't so sure. Hiccup and his friends have to find a way to train the dragons to live in peace with the rest of Berk.

Viki najde novo vlogo za Pljuvača v novi, do zmajev prijazni vasi.

Otroci urijo živino, da bi se bolje počutila v bližini zmajev.

While out flying on their dragons, the kids stumble upon a small dragon with an injured leg. They bring it back to Berk - no one has ever seen this species before, and everyone loves the new dragon, even Stoick, who names him Torch. Everyone but Toothless, that is, who knows that Torch is the offspring of the deadly Typhoomerang, who is heading towards Berk in search of her missing baby.

Ko za škodo po vasi krivijo zmaje, otroci ustanovijo brigado za nadzor zmajev.

Potem ko zmaje preženejo z otoka, mora Viki dokazati njihovo nedolžnost.