The Winter Festival is coming and Po is asked to host the great exclusive formal banquet for all the Masters of Kung Fu. However, the occasion is on the same night as his father's restaurant's own party and Mr. Ping, upset at his son's absence, will not cancel it to cook for the masters at Po's request. Burdened by his father's imposed guilt about his conflicting responsibilities, Po finds all the preparations a dispiriting struggle. However, the solution comes from where he least expects it even as the panda must decide who truly needs him more on the big night.

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.