History of Wu (Secrets of the Forbidden Spinjitzu)

Wasted True Potential
6 months after the defeat of the Oni, Wu is left to deal with the Ninja being in relaxing mood and is utterly incensed by their laziness and the last straw came when the Ninja used the sacred divine bell as a hot tub to relax. Wu angrily confronts them for having done nothing but revel in their victory and becoming out of shape and has them meet in the monastery where he continues to berate his students before telling an old tale about the Monks who would become Ninja. He then sets the chicken that had been used to test the Monks before they could become Ninja and even though they defeated it, he set up booby-traps that caught the Ninja constantly completely off-guard and henceforth humiliated. Wu eventually decided to engage them in battle to show them they have become unfit and soundly dispatched them all before unleashing the chicken to punish them.

Questing for Quests
Wu is meditating when Lloyd came in and asked him for advice on how to get back in shape. Wu is outraged by Lloyd's audacity to ask for advice after having been so lazy for months and furiously tells him to find the adventure they would need.

The News Never Sleeps
Upon learning what happened to the Ninja by Clutch Powers, Nelson and Antonia reach the monastery and told Wu, who compliments Nelson and said that her reminds him of Lloyd before telling them to go home while he went to inform P.I.X.A.L. about the situation. ===

Vengeance is Mine!
Wu and P.I.X.A.L. continue to build the Titan Mech. While building, Nya called from the Land Bounty to tell them that she, Lloyd, and Zane have the second Scroll of Forbidden Spinjitzu, and Wu tells Nya to tell Lloyd to be careful with the Scroll and hurry to the Monastery.

the Fire Fangs continue to break down the doors that are close to breaking, the Ninja started to worried but Cole thought of an idea to hide under the vents but P.I.X.A.L. was doing the finishing touches to the mech. A few seconds later, the doors broke down and when Aspheera came in, she saw that the Ninja and Wu was gone, she was surprised at first than later angry, telling Wu to come out and face her if he has the courage but she was alerted when she heard Jay's sneeze, she was able to find the Ninja and Wu. Face to face with her after centuries, Wu heard her state that she always dream of this moment, but was stopped when P.I.X.A.L. came in with the finish Titan mech and kept her away from Wu and the Ninja.

Wu and his pupils engage Aspheera and her forces but soon she was able to overpower him, the Ninja, and P.I.X.A.L. before holding them hostage until Zane arrives in the ShuriCopter and Lloyd and Nya in the Land Bounty. The tides changing Wu watched as most of the ninja used the second Scroll of Forbidden Spinjitzu to engage Aspheera in an epic Forbidden Spinjitzu.

In the end, Zane was left to face Aspheera who tried to ignore him and use the power of the Scroll to blast Wu but he dodged, making the Titan mech disappear instead. Zane then used the Scroll to freeze Aspheera and the Pyro Vipers. When Jay questions how Zane was able to do that, Wu replies that it was the power of the Scroll of Forbidden Spinjitzu and asks Zane to give the Scroll to him, Zane hesitated at first but went to give the Scroll to him.

But before Zane could, he noticed Aspheera has manage to break her arm free from the Ice and aim her staff to use one final hit at Wu but Zane saved his master by pushing Wu of the way causing him to be hit instead and be seemingly destroyed. The Ninja, Wu, and P.I.X.A.L. were heartbroken that their friend is gone once more.

After the battle, Wu goes to Kryptarium Prison, where he makes a visit to Aspheera whose powers are currently ineffective and being held in Garmadon's old cell. She remarks on how fitting their meeting is, since it is like her first imprisonment. Wu is infuriated that her vendetta cost him an innocent, one of his pupils and ask if she is satisfied with her deed. Aspheera is confused, as she reveals that she never wanted to destroy Wu but make him feel her suffering by trapping him.

Aspheera goes on by stating Zane was not destroyed but banished to a place Wu would never go to, the Never-Realm, Wu was horrified to learn this and runs out as she taunts him before laughing maniacally.