Where is airing: Cartoon Network
How many episodes in 15 season: 30 episodes
A year after Nya saved NINJAGO City and became one with the sea, each Ninja is dealing with the change in his own way. When Gayle Gossip reports that super villain Miss Demeanor is buying large amounts of Vengestone, Cole realizes that this is the perfect time to bring the team together and stop the villain's evil plan. Will Cole be able to convince the other Ninjas in time to save NINJAGO City from Miss Demeanor?
Nya, who is now a water dragon, begins to uncover her true identity after she rescues a drowning man. With the help of another water elemental, Nyad, Nya searches for her lost memories. Can Nya regain her memories and reunite with her friends?
Jay and the other Ninja are still saddened by their lost friend and track down Miss Demeanor's next shipment of Vengestone. After their battle with Miss Demeanor is interrupted by the New Ninja, Nya warns the team that she can only return if she gives up her powers! Can Jay and the others work with the New Ninja to stop Miss Demeanor's plan? Will they find a way to bring Nya back from the sea?
After the mayor refuses to release Aspheera from prison to save Nya, the Ninja take matters into their own hands. With the help of Skylor, who temporarily keeps Nya from melting, the Ninja break into Kryptarium Prison to free Aspheera! Is it the right decision to make a deal with Aspheera? Will the Ninja get back to the Ninja Cave before Nya melts?
Zane and the others make it back just in time to stabilize Nya. But even though they have freed Aspheera, her magic staff is still gone. After Pixal asks Cyrus Borg as to the whereabouts of the staff, the Ninja set out to retrieve it! Can the Ninja obtain the magical staff of Aspheera in time? Will they save Nya, even though Mayor Trustable has declared the Ninja as enemies of NINJAGO City?
While the Ninja are late in returning the magic staff, Master Wu must keep an impatient Aspheera busy with a series of contests. Later, when the Ninja arrive with the staff, they have a new problem. Aspheera is having second thoughts and the New Ninja infiltrate the Ninja Cave! Can the Ninja stop the New Ninja while Aspheera tries to revive Nya before it's too late?
After saving Nya, the Ninja are arrested and put on trial! Despite the help of their lawyer Dareth, the Ninja are sentenced to five years in Kryptarium Prison. While they are in prison, a mysterious masked messenger visits Llyod and reveals that the Crystal King is gathering all the enemies of the Ninja and plans to destroy NINJAGO City! Can the Ninja save NINJAGO City from the Crystal King's evil plan?
At the Monastery, Nya finds the blueprints of the Samurai X Mech after Master Wu assures her that she is so much more than her lost powers. Back at the prison, Pythor, a former serpent adversary, warns the Ninja that the Crystal King is freeing villains from prison. Later that night, a couple of Crystal Spiders sneak into the prison to free Pythor! Will the Ninja be able to stop the Crystal Spiders from freeing Pythor? Can Nya still help the Ninja without her powers?
While riding in a prison bus, the Ninja run into some familiar faces as Nya uses the new Samurai X Mech and Dareth acts as a decoy to help the Ninja escape. Angered that the Ninja have escaped from prison, Mayor Trustable turns to the famous Marshal Hounddog McBrag to find the Ninja! Will the Ninja be able to escape? Or will Hounddog McBrag throw them back into Kryptarium Prison?
While walking through the desert, Zane, Kai, and Dareth get a ride from Sally, a wannabe singer who is on her way to NINJAGO City. After confessing to the Ninja that she ran away from home and borrowed her family's car without permission, they are discovered by Hounddog McBrag and the police! Can the Ninja and Sally escape the relentless Hounddog McBrag?
As soon as Cole, Lloyd, Jay and Fugi-Dove rejoin the others at Twitchy's gas station, the Ninja think about the next villain who will receive an invitation from the Crystal King. After realizing that the villain, the Mechanic, could be next, Hounddog McBrag shows up at the gas station! Will the Ninja manage to escape Hounddog McBrag again and find the Mechanic?
While the Ninja continue to track Lloyd as he heads to the Council of the Crystal King, the Mechanic breaks free and makes his way to the Council of the Crystal King as well. During the Mechanic's fight with the Ninja, a Crystal Spider video recorded the real Mechanic and informed the Crystal King! Is Lloyd headed into a trap? Who is the Crystal King?
Harumi narrates her backstory to Lloyd through a series of crystals. She was revived by the Crystal King in exchange for her service which included forming an army of vengestone warriors. She reveals the identity of the Crystal King and that they plan to steal the weapons of Spinjitzu.
Hounddog McBrag arrives at the Monastery and impounds the Destiny's Bounty. The Ninja track Lloyd through the subway tunnels but walk into Harumi's trap. Crystal Spiders explode and collapse the tunnel, but the Ninja shelter in an old subway car. Harumi uses the Ninja's apparent passing to manipulate Lloyd to her side, and a dark energy boils inside him.
The Ninja take stock of the situation in the subway car. The Council of the Crystal King attacks the Ninja Cave. Wu, Pixal, Skylor and Nya hold them off with the help of Pixal's MiniPix. Harumi's Crystal Spiders bomb the cave. The villains escape with the Weapons of Spinjitzu. The surviving MiniPix rescues everyone but Nya, who escapes in her Samurai X Mech. She blasts off to save the Ninja.
Nya in her mech frees the Ninja from the collapsed subway tunnel and flies them to their new base at the old Samurai X Cave. Back at the Crystal Temple, Harumi guides the Council of the Crystal King through a ritual to transform the Weapons of Spinjitzu into the Weapons of Destruction. The Crystal King also takes physical form.
The Crystal King gives his council new powers and floats the temple into the sky. He gives Lloyd one last chance to join his side. Lloyd refuses and attempts to escape. He evades the Council of the Crystal King and pulls Harumi out of the temple with him. They fall to the jungle below, and Lloyd's tracking signal alerts the Ninja to his location.
The Ninja steal back Destiny's Bounty and their vehicles from the police impound lot with a surprise assist from Master Wu. They head for Primeval's Eye where Lloyd navigates the dense jungle and evades the Council of the Crystal King with Harumi as his prisoner. Lloyd releases Harumi and joins the Ninja. They temporarily retreat at the sight of the Crystal King's power.
The Ninja clash with the Crystal King's army as his temple floats towards Ninjago City. The vengestone warriors negate the Ninja's elemental powers, and the crystals drain their vehicles. Master Wu and Lloyd track down cryptic warnings of this event. With the help of the paperkids, they follow the clues back to Garmadon, living in Ninjago City with NGTV News cameraman, Vinny.
Garmadon shares his journey of personal growth with Master Wu and Lloyd. Vinny has taught Garmadon compassion through caring for a plant named Christofern. Garmadon breaks his vow of non-violence when Crystal Warriors attack the apartment. Garmadon defeats the enemies by taking on a powerful Oni Form that Master Wu believes could be the key to defeating the Crystal King.
The Ninja retreat to the Samurai X Cave to strategize where Garmadon is teaching Lloyd to master his Oni Form. Lloyd struggles because he does not want to embrace his darker side. Master Wu believes there must be an equal and opposite Dragon Form and reaches out to Misako to research. Pixal upgrades the Ninja's vehciles after studying a sample of crystal, and they return to battle.
The Ninja race through Ninjago City in their new golden vehicles and take out Crystal Warriors with the power boost that Pixal installed. Hope is short lived, and the Destiny's Bounty is attacked by Dragonides. The crystal beasts take the Ninja's new vehicles out of commition. Master Wu confronts the Crystal King, but both he and the Bounty are blasted out of the sky.
Master Wu parachutes from the Crystal Temple and is found by paperkids Nelson and Antonia. Jay rescues Nya from the wreckage of the Destiny's Bounty, and Nya saves Jay from Crystal Warriors by reawakening her elemental powers. They head to the harbor with a plan to call for reinforcements. Nelson and Antonia bring Master Wu back to the newspaper warehouse where he broadcasts a message of hope.
Lloyd and Garmadon escape from Hounddog McBrag into the sewers where Lloyd saves the McBrag from crystal-infected Serpentine. Misako returns to the warehouse with scrolls confirming Dragon Form exists, but the text is incomplete. Pixal rescues Zane but his memory is damaged along with his body, and his Ice Emperor persona resurfaces. Ronin and escaped fugitives escort Pixal to Borg Tower.
Skylor rescues Kai and Cole from Pythor using elemental powers borrowed from both Ninja. They take shelter in an arcade and find Jake, separated from his parents. They head for the warehouse through the sewers to avoid the crystal-infected zombies and reunite Jake with his parents. Elsewhere in the sewers, Lloyd and Garmadon discover their potential Serpentine allies have already evacuated.
Kai and Skylor bond over cooking for refugees. Master Wu and Misako struggle to decypher the Dragon Form scroll. Cole uses the paperkid dispatch to contact the rest of the Ninja and coordinate outreach to their allies. Cyrus Borg repairs Zane, and Pixal brings him back online with an emotional outreach. She summons her new mech from the Samurai X Cave. Borg outfits Ronin's fugitives with mechs.
Racer 7 escorts Cole across Ninjago City to send for help, and Lloyd gives Garmadon a chance to prove he has changed.
The Ninja prepare to make their last stand as the crystal army closes in, while Lloyd and Garmadon take the fight to the Crystal King.
Lloyd and Garmadon face the Crystal King as the Ninja strike back at the enemy with old allies and new powers.
The Ninja show their true potential and perform a selfless act to save Ninjago from the Crystal King.
