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Based on the title "[S11E27] Corruption," this episode is part of (specifically from the Legacy of the Green Ninja/Season 2 arc often re-indexed, or associated with the Dark Island narrative).
The Ninja pursue Garmadon to the coast. Kai, Jay, Zane, and Cole are forced to stay behind to deal with the newly evil Nya. [S11E27] Corruption
Garmadon successfully completes the Garmatron, a massive cannon capable of spreading darkness. He, along with the Overlord and the Stone Army, drives the vehicle toward the coast of the Dark Island.
The Stone Army and the Garmatron represent a massive, unstoppable threat compared to previous foes. You can find the series streaming on platforms
Lloyd, Misako, and Sensei Wu rush ahead to stop the Garmatron from reaching the coast. Key Themes
The sudden, forced turn of a close ally (Nya) creates high emotional stakes for the team. Kai, Jay, Zane, and Cole are forced to
Here is a helpful summary and breakdown of the events in that episode: