Quick recap
Three years after the first film, Hiccup and Toothless find the Dragon Eye, a device that, lit with dragon fire, shows maps of islands and species no one on Berk has ever seen. To explore what it reveals, the gang sets up a base on a distant island, Dragon's Edge. There they gain freedom but also become a target. Dagur breaks out of prison and goes after Hiccup again, and Heather returns with a past still full of gaps.

