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Lloyd confronts Zane and attempts to reason with him, but must deal with both a vengeful Akita and Zane's own amnesia. Meanwhile, Grimfax and Kataru battle General Vex and the Blizzard Samurai, but are overcome by sheer weight of numbers. The other Ninja and Krag, examining Boreal, realize that the dragon is made out of ice, and Nya realizes that the Ice Emperor is Zane himself. Just as the Ninja reason what must have happened to cause this transformation, Boreal wakes up and starts attacking them again.
Despite the best efforts of the Ninja and their hairy ally, and even Nya managing to command a massive chunk of ice, Boreal proves too great to be overcome. However, the sight of his friends about to fall rouses Kai, who channels his full power to vaporize the evil dragon once and for all. As the Ninja then rush to help Lloyd, his battle with the Ice Emperor continues, and Zane traps both him and Akita in ice. Vex and his guards then enter, and he urges the Emperor to finish off Lloyd; however, the ruler hesitates, and Vex takes matters into his own hands.
Unwittingly, Vex's gloating over his prospective victim triggers Zane's memories, and he stops Vex and uses the Scroll of Forbidden Spinjitzu to reverse the effects of his own corrupted elemental powers across the realm. After freezing Vex, Zane is reunited with his friends and Akita with her brother Kataru. The Formlings, former Blizzard Samurai, and Ice Fishers are left to resume their peaceful existence, with Grimfax reassuming his throne and Vex suffering banishment. Unfortunately, the Ninja seem to have no hope of returning home, until Cole adds the fruit Krag gave him to the leaves of the Traveler's Tree.
Sorla uses the mixture to open a portal, and the Ninja begin returning to the Monastery of Spinjitzu, where they-particularly Zane-receive enthusiastic greetings from Wu and P.I.X.A.L. Cole bids farewell to Krag, who remains with the Ice Fishers, while Akita surprises Lloyd with a goodbye kiss on the cheek. After the portal closes, Akita and Kataru go for a run in their animal forms, and Akita's thoughts are heard. While Kataru believes they have seen the last of Lloyd and the other Ninja, Akita is unconvinced...