After a shipwreck, an intelligent robot called Roz is stranded on an uninhabited island. To survive the harsh environment, Roz bonds with the island's animals and cares for an orphaned baby goose.

Set 1,300 years after the events of How to Train Your Dragon, dragons are now just a legend to the modern world. When a geological anomaly opens an immense, miles-deep fissure in the Earth’s surface, scientists from all over the world gather at a new research facility to study the mysterious phenomenon. Soon a group of misfit kids, brought to the site by their parents, uncover the truth about dragons and where they’ve been hiding -- a secret they must keep to themselves to protect what they’ve discovered.

Hellbent on taking over Earthrealm, Kano viciously attacks town after town with the aid of three cold-blooded Black Dragon mercenaries. Those who don’t submit are annihilated but one young man won’t bend the knee to Kano: Kenshi.