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Benthomaar tells the rest of the crew of the Hydro Bounty of the ancient battle against Wojira, in which the First Spinjitzu Master led the ancestors of the Keepers and the Merlopians. Despite their brave efforts, Wojira proved too powerful, and it was only the actions of Nyad that defeated her. By merging with the sea, she sacrificed her own identity for the power to defeat Wojira. Wojira's Wave and Storm Amulets were then entrusted to the leaders of the peoples who fought alongside the First Spinjitzu Master. This leads the group to their current task: stopping Kalmaar from returning the Storm Amulet to Wojira.
At the docks, Kalmaar eagerly contemplates flooding Ninjago City, only to be confronted by Master Wu. He sets Gripe and his Maaray Guards upon them, only for Wu to be joined by Kai, Cole, Ray, and Misako. Unfortunately, Kalmaar captures Misako and forces her allies to surrender, and drops them into the ocean with an anchor tied to the entire group. Much to Kalmaar's shock, they rise to the surface atop the Hydro Bounty just as he contemplates the real Storm Amulet beside Clutch Powers' fake.
The reunified Ninja and their allies face off with the enraged Kalmaar and his guards, and Bentho angrily confronts his adopted brother. Kalmaar then attempts to escape in his chariot, only to be pursued by Nya and her whale allies. Nya emerges from the sea, apparently defeated, only to hold up the recovered Storm Amulet. Returning to the Monastery of Spinjitzu, Nya gives Benthomaar-whom they are inviting to stay with them-a guided tour. Kai and Nya say goodbye-in their own ways-to their parents, who are heading back to Four Weapons, with Maya expressing her pride in Nya's maturity. Elsewhere, Cole delivers the Storm Amulet into the keeping of Queen Vania in Shintaro, neither of them being aware that the artifact is fake...