Skales is crowned as the Snake King, and as his first act he plans to destroy the foundations of Ninjago, bringing it down around the population. At the Mojo Dojo, Lloyd is continuing his training, while Sensei Wu and Misako prepare to go over her research on the prophecy.
Wu is slightly uncomfortable because of her relationship with Garmadon and the fact that he could have been her husband. Everything is stopped when the Serpentine begin their destructive campaign, sending the city into chaos. But the Serpentine come up against a barrier, an ancient door inscribed with carvings which look like Skales.
He finds a switch which opens the doorway, revealing a vault where the Stone Army rest. The Great Devourer's venom melts through the roof of the vault and starts dripping on the statues, bringing them to life. They defeat the Serpentine and exit the vault, which closes behind them, trapping Skales and his people underground once again.
The Stone Army rises and the city begins to evacuate, with the Ninja providing transport for those left behind, including comic-book writer Rufus, Dareth and the Bank Manager. The Ninja, with Lloyd, Nya and the Ultra-Dragon, gather the people and flee Ninjago City, though Misako stays behind to get her research and she and Sensei Wu are nearly left behind.
Meanwhile, on the Dark Island, Garmadon is guided by the Overlord to an ancient orrery-like clock, designed to count down to the final battle. Garmadon dons the Helmet of Shadows, which both starts the clock and gives him command over the Stone Army.
Aria still hides in the shadows, not liking her new powers at all. Her mother had used to tell her stories of power that could help or destroy her depending on which she picked. She was 4 when her mother told her stories of many things.
Aria's favorite story was the one about the colored dragons that found a small purple dragon cast in the shadow of the bigger purple dragon and the purple dragon was too stubborn to receive help from the colored dragons.
Her mother never got to tell her the ending, her mother always stopped at a certain point and never continued. Right now everything was so confusing.
Why did Aria turn from 10 to 16. Why does she suddenly have powers now that the dark island is back. She'll ask her father later, when he's done baby sitting the four arms guy.