NINJAGO | S2E12 | Return of the Overlord

The Ninja launch a rescue mission to get Nya and fight Garmadon once and for all. But when they arrive, they find the Stone Army, Garmadon, Nya and the new Super-Weapon have gone to the coast. The reason for this becomes clear: Garmadon is planning to fire missiles of Darkness into Ninjago, gradually turning it into his own image. The Ninja follow, but are stopped and held up by Nya, who has been polluted with Dark Matter and turned into a slave of the Overlord. They eventually overcome and imprison her, then go to the coast and try to reason with Garmadon. The group try but Garmadon says he cannot suppress his Evil and the Ninja are not in time to stop the firing of the Dark missiles from the Garmatron. The balance is shifted as Ninjago is infected by Darkness, and the Overlord betrays and possesses Garmadon, using him to retake a physical form and transforming him into a crocodile-like monster. The Ninja realize the real Dark Lord wasn't Garmadon, it was the Overlord. The reincarnated Overlord attacks Lloyd, who fights with him and tries to bring back his father. Garmadon tries, but the Overlord suppresses him and defeats Lloyd, wrecking the Destiny's Bounty in the progress. The Overlord then opens a portal to Ninjago City and goes through with the Garmatron, along with the Stone Army (and Nya). The Ninja are now stranded on the Dark Island, but Lloyd says, after spying a piece of their ship with the 'Destiny' symbol on it: "We didn't lose the war, today we just lost the fight."