The movie takes place in the same universe as the original "How to Train Your Dragon" film, where Hiccup Horrendous Haddock III (voiced by Jay Baruchel) and his trusty dragon, Toothless, have become iconic figures in the Viking village of Berk. The story follows Hiccup and Toothless as they prepare for the annual Homecoming celebration, a time for the Vikings to come together and showcase their skills.