Years after the ending of the first film, the remaining characters we know and love- along with many new ones- find themselves in a harsh, cold dystopian world. Fighting for their lives, their friends, and the very fate of dragonkind itself, they flee to the one place on the planet where they can be safe... the Sanctuary.

Eight months after a zombie apocalypse, two high school friends, a punk rocker and a dragon meet in a ruined Massachusetts town. From their, they travel north in search of the one thing that may save their world. Along the way, they gain many allies- and enemies. Part post-apocalyptic epic, part mega-crossover, with elements from How to Train Your Dragon, Pokemon, and Portal.