Set 1,300 years after the occasions of Just how to Train Your Dragon, dragons are now just a legend to the modern world. When a geological anomaly opens up a tremendous, miles-deep fissure in the Planet's surface, scientists from throughout the world gather at a brand-new research facility to study the strange phenomenon. Soon a group of misfit kids, offered the site by their moms and dads, reveal the reality about dragons and where they have actually been concealing-- a secret they have to maintain to themselves to shield what they've found.