Season 3: Rebooted

Story:

Some time after the Overlord was defeated by Lloyd, Ninjago City has been rebuilt into a futuristic metropolis and renamed New Ninjago City.

The Ninja, striving for action, learn that the Overlord survived the final battle and is trapped in the Digiverse as a virus. The crippled cyborg Cyrus Borg, creator of Borg Industries, realizes this and gives the Ninja the Techno Blades, which are the keys to destroy the Overlord.

The Overlord uses P.I.X.A.L. (an android who works at Borg Industries) to create an army of Nindroids from Zane's blueprints and plans to capture Lloyd, as his Golden Power will help him escape the digital realm. The hard drive containing the Overlord is later stolen by Pythor, revealed to have survived being eaten by the Great Devourer.

He captures Lloyd, and the Overlord drains him of most of his Golden Power. Though the Ninja defeat him in the Digiverse, the Overlord escapes the digital realm half-formed. Lloyd then splits his remaining Golden Power among the four Ninja therefore restoring their Elemental abilities, knowing that the power would be a big responsibility for him to bear alone.

The Overlord, needing to complete his transformation, sends the Nindroids to space to retrieve the Golden Weapons from the constellation Arcturus, which they succeed in doing. The Overlord becomes the Golden Master, fulfilling an old Serpentine prophecy, and wreaks havoc on New Ninjago City. With no other option, Zane sacrifices himself to destroy the Golden Master. However, he survives, trapped in the systems and rebuilds himself using titanium.

Episodes:

27. "The Surge"
28. "The Art of the Silent Fist"
29. "Blackout"
30. "The Curse of the Golden Master"
31. "Enter the Digiverse"
32. "Codename: Arcturus"
33. "The Void"
34. "The Titanium Ninja" (Season Finale)