After defeating Perilia for the fourth time in a row, the ninjas and Tabitha are sent to another dimension (with Varian and Hiro by the side). The group is separated once again, but they all land in the same world. Berk. The realm where dragons once roamed free. It has been many years since human kind has seen any type of those dangerous reptiles, and when rumors spread about a being that is part dragon and part human stealing livestock and attacking any Viking approaching it's territory, Berkians begin to grow uneasy. There are also rumors of a group of people who ride Night Furies in the night stopping any dragon trappers and conquerors. Will Hiccup and his friends, new and old, be able to solve these issues? Or will those secrets take the ninjas to their graves?