At the Ninjago Museum of History, the Night Watchman is playing with the animatronic characters in the Ninja exhibit(anyone started thinking of fnaf?), when he is interrupted by a shadowy figure.
He warns the intruder that he knows Spinjitzu and has unlocked his True Potential, but is distracted when the Lloyd animatronic begins operating by itself unusually, saying, "I am the Ultimate Spinjitzu Master," and the museum lights up with a green aroma, showing that something has gone wrong.
Elsewhere, Kai, Jay, Cole, Zane, and Lloyd use their Elemental Dragons to capture a Fangfish that had been terrorizing a nearby village. They are successful in their efforts, and return to the coastal village where Kai congratulates Lloyd for growing into a great leader, though the Green Ninja expresses his doubts about his future now that his dad is gone.
Kai promises Lloyd that he will take care of him. After the Ninja cunningly catch the fish, a photographer takes a picture of the Ninja and the fish, using it as proof that they caught it. They pose in front of the Fangfish, though Zane accidentally orders the photographer back too many steps, and ends up falling into the Endless Sea.
The Ninja head to Wu's new tea shop, Steep Wisdom. There, they are met by the owner himself and ordered into Ninjago City to hand out flyers promoting the shop. Believing that they have come to rely too much on their powers, Wu prohibits the Ninja from using them to promote the store. Before they can leave however, Misako receives a call from the Museum, requesting Lloyd.
"Where's Aria" Kai asked
"Sleeping" Misako answered
"Well someone should go wake sleeping beauty and have her come with us, she's a ninja too" Jay said
"Don't wake her up" Wu said "she was up all night watching over Ninjago"
"Why would she do that?" Lloyd asked
"So you all could get some sleep" Misako said smiling.
"Alright guys let's head out" Cole said
Lloyd goes to the Museum and meets the Night Watchman. After questioning him, he is dragged into a room where a stolen artifact called "The Allied Armor of Azure" is housed, only for Lloyd to find that the armor is actually being worn by the Watchman, who is possessed at the time.
Lloyd avoids his attacks, but the spirit of the Cursed Realm possesses a picture of Chen. Then, he possesses a statue of Skales to trap the unaware Green Ninja, and creates a body out of sand to possess Lloyd. The security guards outside hear Lloyd yell, and an eerie wind starts to blow.
Back in the city, the four Ninja are hopeless in their efforts, as they attempt to hand out the flyers to the citizens. Eventually, they decide to ignore Master's demands to not use their elemental powers to accomplish the task, but they do so anyway, much to the enjoyment of the civilians.
Suddenly, a strong wind blows through the city, sending people fleeing, and ridding the Ninja of their elemental powers for some reason. Astonished and confused, the Ninja head back to see Master's tea shop, which has its first customers. The Ninja frantically ask Master about what's happened to them, and as he comes to a realization, Morro arrives, possessing Lloyd's body.
The Ninja confront the ghost general outside of the shop, fighting him as hard as they can, but to no avail, as he swiftly overwhelms them. Aria came out and ran over to the ninja while Misako rides off with the customers, while Master Wu and Nya board the Bounty.
Aria and Morrow looked at each other, none of them moved. They just looked at each other.
"Morrow" Aria managed to say
"It's good to see you, little sister" he said smiling
"Sister!" The ninja shouted
"Why are you possesing Lloyd! Let him go!" Aria shouted standing up
"I'm sorry i can't do that" Morrow said using wind to push her and the ninja away, them more then her.
Seeing they cannot defeat Morro or save Lloyd at that time, Cole, Jay, and Zane board the Bounty. Kai initially stays to try and help Lloyd, but he and Aria are forced to board the Bounty by the other Ninja.
Nya struggles to get the Bounty moving, but Morro drags it back towards him using large gusts of wind. Finally, Nya manages to break the Bounty free of the wind, thanks to Aria also using a wind elemental... they will have a chat about that with her later, and it flies off, leaving an infuriated Morro behind. On board the ship, the Ninja once more ask Master Wu about what happened, to which he tells them that they were not his first students, and instead, his first student was Morro, who was the Elemental Master of Wind.
"ok ok how did Aria use wind?" Kai asked
"Well when i was young i had the ability to learn any element and my brother Morrow taught me wind" Aria shrugged
"He's your brother!" Kai shouted
"not by blood but he's like my brother" Aria explained "he used to be so nice"
"To you Aria, because you two were close as siblings. After you left things started changing..." Wu said sadly
At that moment, Morro approaches the Bounty as he flies a ghostly dragon through the sky, much to the Ninjas' horror.
"Morrow has a dragon! Could this get any worse!" Aria shouted