The Bad Guys are struggling to find trust and acceptance in their newly minted lives as Good Guys, when they are pulled out of retirement and forced to do "one last job" by an all-female squad of criminals.

After moving to a new town, a rebellious girl forms a bond with a wild mustang and finds a connection to her late mother’s legacy as a trick rider.

Inventor Flint Lockwood battles mutant food beasts created by his notorious machine, including shrimpanzees, tacodiles and jellyfish sandwiches.

The Viking town of Berk, now enjoying its new alliance with the dragons, is preparing for its annual winter holiday of Snoggletog. However, that spirit is threatened when all the dragons, except Toothless who needs Hiccup to help him, suddenly fly away for some reason. While Astrid ineffectually tries to salvage the occasion, Hiccup decides to build Toothless a new prosthetic to allow him to fly independently, only to have the dragon take off as well. However, as the holiday approaches, Hiccup finds himself swept up to learn the dragons' secret the hard way and to find a solution to bring them home early.