In need for a quest, the ninja head to the pyramid and accidentally release Aspheera, a Serpentine sorceress who desires revenge against Wu. She drains Kai's powers and locks the ninja inside the pyramid before heading out to Ninjago City.
While there, Aspheera discovers the Scroll of Forbidden Spinjitzu, the weapon Wu used to defeat Aspheera. She is able to obtain it and defeat the ninja again when they arrive. Knowing little about Aspheera, the ninja split into groups with one team learning about Aspheera and another trying to stop Aspheera from causing chaos in the city.
The siege begins
After finding out that Wu was the Treacherous Deceiver and not Garmadon, Kai, Jay, Cole, and P.I.X.A.L. begins to blame Wu for his actions. However, the Pyro Vipers located Wu at the Monastery and attack it, forcing the ninja to defend themselves by using water guns and rubber shurikens, but only for the defenses to be banished to the Never-Realm.
When the ninja, Wu, and P.I.X.A.L. had no other choice to but hide in the hangar bay, P.I.X.A.L. thought of an idea to build an unfinished Titan Mech (which would later be Lloyd's) in order to defend themselves against the Pyro Vipers. After hearing that Aspheera and Char found the entrance to the hangar bay, Wu decided to give himself over to Aspheera as to make up for his past mistake, but only for Kai to apologize for his anger towards Wu and that giving himself over to Aspheera will be another mistake while the others promise Wu that they'll take the Pyro Vipers down together.
While the Pyro Vipers were breaking into the hangar bay and Kai, Jay, Cole, Wu, and P.I.X.A.L. were building the Titan Mech to defend themselves. Lloyd, Nya, and Zane went to the Explorers Club to get the second Scroll of Forbidden Spinjitzu, but only to be quickly rejected by the club.
Moments later, when the club saw that the ninja were trying steal the scroll, Cecil Putnam tries to stop them but only for him and the security guards to be attacked by Tiger Wasps, letting the ninja to get the second Scroll of Forbidden Spinjitzu and leave.
Battle for Wu
Once Lloyd, Zane, and Nya stole the second Forbidden Scroll, they were able to save the other ninja, Wu, and P.I.X.A.L. from the Pyro Vipers and Lloyd, Jay, and Cole engaged in a Forbidden Spinjitzu battle with Aspheera, but only to be defeated and the Titan Mech to get banished to the Never-Realm. However, Zane was able to use the Forbidden Scroll and defeat the Pyro Vipers by freezing them.
When Aspheera was able to break her arm free from the ice and attempt to strike Wu with her staff, Zane saved Wu by pushing him and get hit instead, causing Wu and the others to think that Zane was destroyed.
Despite the ninja defeating the Pyro Vipers and imprisoning Aspheera in cell one, it comes at a cost as Aspheera seemingly destroyed Zane. When Master Wu went to interrogate Aspheera, she reveals that she didn't want to kill Wu, but to make him feel the suffering that she went through thousands of years ago. She tells Wu that she did not destroy Zane but banished him to the Never-Realm, laughing wickedly at the devastated Wu who ran off.
- 110. "Under Siege"
- 111. "The Explorers Club"
- 112. "Vengeance is Mine!"
- 113. "A Cold Goodbye" (dream)
- 118. "The Message" (story)
- 126. "A Fragile Hope" (flashback)
- 128. "Awakenings" (flashback)
War of the Oni and the Dragons · Battle of Nine Days · Stone Wars · Reign of Aspheera · The Devourer's bite · Long Winter · Serpentine War · Battle for All of Time · Battle between brothers · Search for the Golden Weapons · Attack of the Great Devourer · The Final Battle · Nindroid crisis · Second Serpentine War · Battle of Stiix · Fall of Ninjago · Rise of Ninjago · Oni's invasion · Siege at the Monastery · Lloyd's Journey · Liberation of the Never-Realm · Attack by Unagami · Battle for Shintaro · Conflict on the Island of the Keepers · Kalmaar's assault on Ninjago City