Spoilers to Ninjago Crystalized

One year after Wu's disappearance, the ninja are still searching for him while at the same time, protecting Ninjago.

Lloyd fails to stop the rising criminal syndicate, the
Sons of Garmadon, from stealing the Mask of Vengeance from Borg Tower. After that Lloyd calls the ninja back to Ninjago City.

Nya defeats the cruel masters and frees the rice farmers.

Jay and Cole visited the Mountain monastery and mistakingly thought that Quanish the Elder was Wu.

Kai and Zane stop the Mechanic, who escaped from Kryptarium prison.

The ninja are debriefed by Hutchins that they must protect the Oni Masks and the Royal Family.

The ninja are introduced to the Royal Family. Lloyd becomes smitten with Princess Harumi.

As the ninja guard the Mask of Deception, the Sons of Garmadon attack the Royal Palace, leading to the deaths of the Emperor, Empress, and Hutchins, forcing the ninja to take in Harumi.

While an interrogation with a Son of Garmadon goes awry, Lloyd and Jay learn the story of the Oni and the Dragon, which reveals the truth about the First Spinjitzu Master and some of Ninjago's greatest evils.

Cole and Zane attempt to infiltrate the Sons of Garmadon as Rocky Dangerbuff (Cole) and Snake Jaguar (Zane). Zane successfully falls in with the group and is taken to the "big man." Zane (as Snake Jaguar) takes part in an initiation race to become a Son of Garmadon but is revealed as a spy and attacked by the gang leading to a battle with fellow Nindroid, Mr. E, leaving him within an inch of his life.

Cole, who has been captured by the Sons of Garmadon, rescues a baby who they call the "key to the third mask."

The ninja recover Zane and flee with the baby, hiding within a storm known as Dead Man's Squall in order to keep the baby safe. The baby starts crying, but is calmed down by Harumi with a lullaby. The ninja find a map wrapped around the baby revealing the Mask of Hatred to be located within Primeval's Eye.

A trap left by Mr. E with Zane, gives the Quiet One control of the Bounty's computer, sicking Samurai on the Ninja, with the mysterious vigilante's identity revealed to be P.I.X.A.L.

Lloyd and Harumi, separated from the others, traverse Primeval's Eye and after a series of chaotic events, reach the Oni Temple.

The ninja learn the baby is Wu because of his fondness for tea. The realize was turned this way by the Reversal Blade.

A message Zane recorded is traced back to the Quiet One, who is revealed as Princess Harumi. The Sons of Garmadon capture the ninja and Toddler Wu on the Destiny's Bounty.

Lloyd and Harumi enter the Oni Temple to retrieve the Mask of Hatred, where Lloyd discovers that Harumi is the Quiet One, and the baby is Wu. Harumi escapes with the Mask of Hatred. The Sons of Garmadon capture Lloyd and steal the Destiny's Bounty to return to the Royal Palace.

The ninja and Toddler Wu return to Ninjago with the help of Crabby and enlist the help of the Police Commissioner and his police force.
Harumi reveals that she captured Misako after she found Wu.

Harumi attempts to revive Garmadon, but supposedly fails. She and the Sons of Garmadon are arrested and sent to Kryptarium Prison. Garmadon is successfully revived, and breaks Harumi out of the police station.
Misako and Wu seek refuge in Dareth's apartment for the time being.

Garmadon and Harumi capture Kryptarium Prison and use it as their base. Lloyd abandons the ninja on the Destiny's Bounty and travels to Kryptarium Prison to confront his father. Garmadon beats Lloyd to near-death and proceeds to Ninjago City with the Sons of Garmadon.

The Sons of Garmadon threaten a nearby village, whose inhabitants surrender when Garmadon begins to construct his Colossus.

Lloyd is found in his near-dead state by the ninja and is taken to Mistaké's Tea Shop, where he is revived. Mistaké gives Jay some Traveler's Tea for use in a time of need.

Garmadon and the Sons of Garmadon attack Ninjago City with the Colossus, while the ninja (minus Lloyd and Nya) and Samurai X attempt to fight it off. Lloyd wakes up with black eyes and finds that he has no powers. Nya takes him to Dareth's apartment to reach Wu before Garmadon does. In attempt to hide from Garmadon, Misako and Wu try to leave Dareth's apartment, but they find Garmadon in the halls. Nya and Misako fight Garmadon while Lloyd escapes with Wu.

Harumi tries to prevent Lloyd from escaping with Wu, but he manages to get Wu to the ninja. As the Destiny's Bounty is being crushed by the Colossus, Jay activates the Traveler's Tea, and transports himself, Cole, Kai, Zane, and Toddler Wu to the Realm of Oni and Dragons.

Lloyd vows to defeat Harumi and escapes with Nya, Misako, and Samurai X.
Garmadon is free to take over Ninjago and becomes Emperor Garmadon.

The ninja (in a battle damaged state) and Toddler Wu wake up in the Realm of Oni and Dragons.

One week after the ninja's assumed deaths, Lloyd and Nya created The Resistance, which consisted of several Elemental Masters.

Cole and Kid Wu find Stormbringer and Stormbringer's baby. The stranded ninja (other than Cole and Kid Wu) are captured by the Dragon Hunters.

Skylor, Karlof, Shade, Mr. Pale, Tox, and Neuro join The Resistance and goes to their secret base.

Garmadon destroys Mr. E for failing to capture Lloyd.
Mistaké reveals that Cole, Kai, Jay, Zane, and Wu are in the Realm of Oni and Dragons.

The Resistance briefly take control of the airwaves.
Garmadon nearly kills Harumi.

Iron Baron orders the Dragon Hunters to hunt the ninja. The ninja see the Firstbourne for the first time.

Wu dreams about fishing with his brother, Garmadon, and his father, the First Spinjitzu Master. Upon waking up, Wu has aged up into a teenager. Heavy Metal reveals herself to be Faith and joins the stranded ninja.

Jet Jack wants to get revenge on Faith.

Mistaké reveals that she is an Oni and that The First Spinjitzu Master's family lives so long because of their Oni blood.

The Stranded ninja venture into "Oni Land."

Harumi asks that Garmadon takes her as his child instead of Lloyd and Garmadon takes Harumi as his "daughter." (This is why Llorumi is weird to me and why I hate Harumi so much...other than betraying Lloyd, sure that's reasonable but what the hell? This is some cult type shit right there)

The stranded ninja enter the ruins of the "Oni Temple" but there are no Oni. Faith is enraged at how Iron Baron lied to her and the rest of the Dragon Hunters.
The stranded ninja find the map to the Dragon Armor in the "Oni Temple."

Lloyd captures Harumi.

Faith trains the stranded ninja at using Chain rifles.

Mistaké uses her Oni powers to shape shift to look like Harumi and "captures" Skylor. She tries to get Skylor near enough to Garmadon to steal his power, but fails when the real Harumi comes and reveals who is truly Harumi. Mistaké transforms into her true Oni form. Mistaké tricks Garmadon into letting Skylor touch him. Skylor escapes Garmadon, but Harumi, their generals and Garmadon kill Mistaké.

The stranded ninja are captured by the Dragon Hunters again. Wu regains all his memories, causing him to age further, grow a mustache, a goatee and even his signature straw hat falls on his head. Wu escapes and attacks the Dragon Hunters, but Iron Baron forces him to find the Dragon Armor for him.
Faith reveals Iron Baron's secrets and lies.

Skylor temporarily manages to control the Colossus, but Garmadon uses his powers to hurt her and takes control of the Colossus. Before he manages to do that, Skylor destroys the Oni Mask of Deception through the Colossus.

Harumi dies in a building collapse to save a child, after remembering her biological parents' deaths to save her and realizing the wrongness of her ways, and gets sent to the Departed Realm.

The Dragon Hunters decide to ally with the stranded ninja instead of Iron Baron. Wu finds the Dragon Armor. The Firstbourne encases Iron Baron in a pile of molten rock/lava and lets Wu obtain the Dragon Armor.

The Oni Mask of Hatred is destroyed, leaving only the Oni Mask of Vengeance intact.

Wu rides the Firstbourne while the ninja ride their respective dragons to return to Ninjago.
Faith chooses to stay back and she leads the Dragon Hunters. The ninja make their return to Ninjago, and plan to fight Garmadon and his forces.

Lloyd and a younger Wu fight Lord Garmadon on the desecrated roof of Borg Tower.

The ninja battle the Colossus with their new Dragons, using Vengestone chains to try and incapacitate it.
Lloyd faces off against his father alone, using what Garmadon taught him (the Art of the Silent Fist) to "fight without fighting." (Sad my god why)

The ninja and their allies manage to incapacitate the Colossus, which falls.

Garmadon loses his Elemental Power, as he is not fueled by Lloyd's "fight", and Lloyd regains his power.

The Colossus crumbles apart, and Garmadon warns Lloyd of a coming darkness. Garmadon is arrested.
After the battle, Wu quickly ages back to his old, normal self.

The ninja celebrate their victory, while Lloyd dreads the "coming darkness" his father spoke of, speculating with Wu that it may be the legendary Oni.

Post battle

Harumi meets the Overlord in an unknown place where she joined him in his plan of revenge.

The Overlord resurrects Harumi and helps her free herself from the debris of the building that fall on her giving her the central crystal.

After defeating his father, Lloyd searches for Harumi in the building debris without success.

Harumi arrives at the Oni Temple and places the central crystal there, becoming the Crystal Temple.

So in every situation, Harumi basically becomes a cult leader either way...