This may as well be his Fortress of Solitude, or to borrow an analogy from that greatest of fantasy-movie sequels, “The Empire Strikes Back” (whose influence on DeBlois cannot be underestimated), it’s the spiritual equivalent of Dagobah, where Yoda trains Luke Skywalker in the ways of the Force.
The influence of The Empire Strikes Back is readily apparent between the often icy environments and steeper stakes (DeBlois has admitted as much in interviews), and although the original’s entire voice cast has reprised its roles, Baruchel and America Ferrera (as Hiccup’s now-girlfriend, Astrid) contribute subtly mature work bringing their lead characters forth from their teens into something resembling adulthood.
This sequel has been pitched by director Dean DeBlois as The Empire Strikes Back to How to Train Your Dragon's A New Hope, picking up five years after the events of the original with Vikings and dragons living in harmony on the island of Berk.
The follow-up has both the solemnity and big story turns that made The Empire Strikes Back a superior sequel, as well as the cartoonish, kid-oriented set pieces that made Return of the Jedi more of a family-friendly adventure.
Like The Empire Strikes Back (which is a terrific qualitative allusion here), How to Train Your Dragon 2 is a marvelous middle act.
The animated sequel takes cues from "The Empire Strikes Back" the same way "Skyfall" took cues from "The Dark Knight."