The Ninja and Nya return to New Ninjago City, where they find a mob of angry civillians and Cyrus Borg, who is no longer influenced by the Overlord.
The Ninja agree to go underground to search for the Serpentine, believing that they stole the hard drive containing the Overlord, while P.I.X.A.L. stays behind to assist Cyrus.
Meanwhile, the Stranger discusses his plans with the Digital Overlord to obtain a power source for the Nindroids, while Lloyd and Master Garmadon make their way through Hiroshi's Labyrinth to stay hidden.
The Ninja and Nya search underground for the Serpentine, eventually finding Skalesoutside of the Stone Army Tomb.
Skales brings them inside and tells them how they have decided to adapt to a new life and become more "civilized," choosing not to become involved with any of the Overlord's plans.
Acidicus then tells the group about the "Curse of the Golden Master," a legend telling of two beings whose power will equal that of the First Spinjitzu Master's or even greater.
The Serpentine attempted to warn people of this, but were treated as the enemy, to which they fled underground.
In the meantime, Cyrus Borg meets with P.I.X.A.L. in his office, with P.I.X.A.L. telling Cyrus of her connection with Zane. Cyrus tells her that she doesn't belong to anyone, even him, and that she is fully independent.
Dareth also acts as the substitute teacher for Master Wu's students, as they go to the city's aquarium.
There, while viewing the Electrocobrai exhibit, the Stranger arrives and shatters the tank. He obtains the Electrobrai while Dareth fends off a shark, saving the students.
Underground, the Ninja contemplate the situation until an army of Nindroids raids the tomb. The Serpentine scatter with the Ninja defending them and defeating the Nindroids by finding out that the Electrocobrai are their power source.
Skales tells them at the Curse of the Golden Master is upon them, and says that they would not be able to assist the Ninja because they're choosing to stay out of the conflict. The Ninja then return to the surface.
As Lloyd and Master Garmadon continue their journey, they're attacked by the corrupted Master Wu and various Nindroids.
Garmadon battles Wu, while Lloyd uses his Golden Power to create a motorcycle to escape. He is pursued by various Nindroids using flight gear, although he manages to evade them all before coming to a stop next to a cliff.
There, the Nindroid MechDragon rises up before him, possessed by the Overlord. Wu is holding Garmadon hostage on its back.
Lloyd prepares to battle the Mechdragon.
He heard someone "Llo-"
The Stranger unleashes a snake that constricts Lloyd, draining him of his powers.
The Stranger then reveals himself to be Pythor, having survived his ordeal with The Great Devourer, although his skin was bleached white in the process.
Pythor brings Lloyd aboard the Mechdragon, after which Garmadon is pushed off the side and into the water.
"Let me go you stupid tin cans, I swear I'm going to scrap all of you"
Lloyd looked over to see two nindroids holding Aria.
"Aria" Lloyd mumbled
"Calm down my dear, everything's going to be fine" he heard the Overlord's voice
"Fine! Garmadon could've died!" Aria shouted
"Who cares, we have what we want" the Overlord said
"...but daddy" Aria said sadly
"My princess, you still have much to learn, release her" the Overlord said and the nindroids let go of Aria
Aria kicked both nindroids off the ship and the Overlord and Pythor laughed.
"Still as fiesty as ever i see" Pythor said
"They had it coming" Aria mummbled, she looked at Lloyd and quickly looked away feeling guilty
As the Mechdragon flies off with Lloyd, Garmadon emerges from the water, telling his son to be strong, and that he would find him.