In the Anacondrai Temple, Kai, Jay, Griffin Turner, Neuro, Paleman, and Shade are being led in chains made of Vengestone to have their powers taken away.
As most of the Masters lament on the situation of not heeding the Ninjas' warning about Chen, Neuro remarks they should've teamed up sooner but that it's already too late.
Jay attempts to keep a positive attitude as Kai berates him for that because of the fact that they're about to be powerless. Jay is still confident that Lloyd will save them.
Upon being brought before Clouse and Skylor, Kai questions how she could help her father knowing that he'll need her element for the spell.
Saying she had no choice, Kai says whoever planned to have him fall for her, it worked, which surprises Skylor, and causes her to smile to herself.
Chen arrives via Gravity-defying throne, happy with the décor, and the fact that he'll soon have more elements in his Staff. Jay states his belief in Lloyd, which Chen doubts, but waits a few seconds to see if Jay's right.
Getting bored, Chen raises his Staff and takes the Masters' powers while saying "Only one can remain!" Upon Chen ordering for the Masters to be sent to the factory, Skylor begs for Kai to be spared, saying that he can help them, to which Chen agrees with, noting her feelings for him.
Outside, Lloyd, Nya, and Garmadon are near the entrance to the temple. Nya realizes that they'll have to wait until nightfall due to the amount of guards, though Lloyd protests.
However, Garmadon comforts his son and says that someone with real power empowers those around him. Aria... was sitting in a tree watching.
In the factory, Jay is set to work on the line where he is met by Cole and, more importantly, Zane, who he is impressed to see again, due to his new form.
Cole has Jay keep quiet as he explains that the guards think he and Zane have escaped. Jay questions what brought them back to the factory and they show him their progress on the Roto Jet.
Cole explains that the guards assume Karlof is fixing a noodle machine. Upon Cole asking where Kai is, Jay states that he's receiving special treatment.
Chen shows the Red Ninja his trophy collection (containing parts of the Ninjas' past adventures), though an irritated Kai responds that if Chen didn't have his Staff, he'd strike the villain down. Amused, Chen replies that Skylor was right, as even without his power the fire still burns bright within Kai.
He explains that unlike Kai and Skylor, who got her powers from her mother, he himself had no abilities and was told that he'd amount to nothing.
He then shows Kai a portrait of Arcturus, and announces with Lloyd's power, he'd be unstoppable. He then tells Kai that he knows he's still jealous that Lloyd became the Green Ninja and offers to give him the power that he had wanted to try for so long.
However, Kai refuses to betray his friends. Chen counters this by promising dark secrets about his parents that his masters never told him. Clouse comes to tell him of Lloyd initiating his plan soon, and they leave Kai to consider his offer.
The three refugees sneak into the palace unnoticed, though Lloyd sets off a trip wire, and the trio is soon surrounded by Cultists. Nya decides to hold them off, while the Garmadons go on, only to encounter Clouse.
Lloyd is forced to leave his father behind and falls into another one of Chen's trapdoors into a cave made by Clouse's serpent. Kai appears and gets the Green Ninja out.
Kai advises him on the situation and plan, but Lloyd refuses and says he needs to face Chen. With that, Kai blows out his torch and leaves while Lloyd finds himself with Chen in the throne room.
Shocked that Chen managed to turn Kai against him, Lloyd proceeds to battle while trying to talk some sense into Chen. However, the man uses everyone's elements to overwhelm the Green Ninja and easily defeats him.
"Great job greenie, now I have to do work" Aria mumbled standing up.
Nya wakes up in the dungeon of the serpent where, along with Garmadon, she's chained to a post. Chen, Clouse and Skylor approach and inform them of Lloyd's defeat, and that his power will be taken soon. Nya questions how they were able to defeat him. Chen explains that he had help. Kai then enters the chamber.
This shocks Nya. Kai defends his actions by saying that Lloyd would never have stood a chance alone. He tells Nya that Chen will let her go, but Nya angrily states that she rather be snake food than take up an offer of the villain.
Garmadon, now enraged at Chen turning the Ninja against each other the way he had done to their ancestors, grabs Skylor and threatens her unless he and Nya are released. Chen calls his bluff due to his reform and he's forced to release Skylor, leaving her shocked at her father.
Clouse opens a tunnel door for his snake to enter after its nap while Nya tries to talk sense into her brother. As everyone leaves, Kai winks at them.
As Chen and Clouse leave to prepare for the ceremony, Kai pulls Skylor back and explains he can get the Staff. Skylor asks why he'd tell her after her betrayal. Kai states that she had let him go for a reason, with her feelings for him being the most obvious choice. This makes her smile again.
Back in the factory, Jay is working on the roto jet when Karlof signals the Ninja that Zugu is approaching. Zugu tells them of the feast celebrating the Green Ninja's defeat, and that they need noodles for it. Upon removing the sheet, the cultists realize the truth while Cole jumps inside the jet and begins firing.
However, the blaster overheats while the Masters turn the Jet to fire and Karlof continues work on getting it to fly. Firing two missiles in the process, they make an opening and push the jet through it.
The ceremony begins, and Lloyd is brought in by Kapau and Chope. Lloyd questions why Kai would betray him, though Kai tells him not to worry. Chen then has Skylor give up her powers.
In the dungeon, the serpent is close while Garmadon assumes that karma has caught up to him for destroying The Great Devourer. Just as the serpent is about to eat Nya, the Masters crash through the wall with the roto jet and shoot at the ceiling, crushing the serpent with rocks and debris. Nya hugs Zane in joy of his return, while Cole congratulates Karlof on completing the jet.
By now, Skylor has completely lost her power, and Chen proceeds to take Lloyd's Energy. As Clouse begins the spell, Kai tells Chen he forgot one element: surprise.
"Make that two elements" Aria said coming down from the roof and kicks the Staff out of Chen's hands.
Kai freed Lloyd, while Aria held off the cultists and froze Clouse. Lloyd tells Kai to destroy the Staff, but he begins to become corrupted by its power.
Just before he uses it on Lloyd and Skylor, everyone busts in and attacks, causing him to drop the Staff. Lloyd is happy to see Zane again as they fight off the cultists.
Chen spots his staff and runs to retrieve it, but Kai spots and grabs the Staff before Chen does and destroys it, restoring everyone's elements and allowing them to overpower the cultists.
Then Lloyd, Aria, Kai, Jay, Cole, and Zane all reunited, performing Spinjitzu to finish off and capture the Cultists as Nya expresses her joy at seeing them fight together again.
Garmadon goes up to where Clouse was, but finds that he had escaped from Aria's ice along with Chen, Eyezor, Kapau, Chope, and Zugu, with Skylor as their prisoner. Chen says the fact that his plans were ruined as Clouse tries to reassure his master that they find a way to achieve victory.
With the Elemental Masters now in control of the island, Nya and Garmadon assure Kai they'll find the remaining cultists and rescue Skylor.
Kai says that they had found an old friend, but he didn't expect to make new ones. Zane turns on his humor switch and starts dancing, just like in his father's old lab, entertaining the Elemental Masters.
"where's Aria?" Lloyd asked
"Don't know" Cole answered