The only chance of survival for a small clan is the Frozen Opera, where the froslass perform an anthem as prayer for an almighty blizzard. Dreaming of performing the aria, Arctina is forced to evolve into a glalie to act as a guardian. As she grieves, an outsider arrives, refusing to utter a sound yet prophesied to be their savior prima donna. When the two and the bitter previous diva set off to hold the rite on their own, they create harmony out of discord when they clash with each other and a frigid god.