The Time Twins and Vermillion take Wu back to their base, with General Machia being promoted over Commander Blunck and Commander Raggmunk. The Ninja, eager to make amends for their previous losses, decide to split up, with most of the group heading to the Ninjago Museum of History while Kai and Nya attempt to get the temporal scanner on the Destiny's Bounty 2.0 back up and running. Misako gifts Lloyd with a new vehicle, the Destiny's Shadow, and reveals that Wu is rapidly aging, forcing the Ninja to hasten their efforts. Kai then reveals to Nya Krux's claims that their parents are traitors; the two then split up, with Kai going to their family shop and Nya setting out to find out the identity of Samurai X. At the same time that the other Ninja discover Krux's hidden lab in the museum, Kai finds a secret forge and a strange dagger beneath the shop while Nya confronts the new Samurai X in the Samurai X Cave.
Lloyd's team then discovers a door into the sewers of Ninjago and set out, encountering Skales and other Serpentine who reveal that the Vermillion snakes are the offspring of The Great Devourer before pointing them in the direction of the Time Twins' base. Nya fights with Samurai X, who changes their voice to sound like Ronin, Dareth, Misako, Garmadon, Kai, Cole, and even Nya herself while refusing to reveal their true identity for fear of endangering their friends. Nya admits to understanding their reasoning, and agrees to let them retain the identity and even gives them a new vehicle, though she insists on them changing the armor's color scheme. She also comes to believe that Skylor is the new Samurai X, but is proven wrong when she meets up with Kai, who reveals that their parents are alive.
Machia is credited with proposing Wu's capture, but it was actually Acronix in the previous episode.
1. Farewell the Sea · 2. The Call of Home · 3. The Shape of Nya · 4. A Mayor Problem · 5. Public Enemies 1, 2, 3, 4, and 5! · 6. A Painful Promise · 7. Ninjago City vs. Ninja 8. Kryptarium Prison Blues · 9. Hounddog McBrag · 10. The Benefit of Grief · 11. The Fifth Villain · 12. The Council of the Crystal King