After a mysterious event known as "The Merge" shuffles the universe, an aspiring Ninja teams with a smart techie to navigate a new and unfamiliar world.
Loyd saves Arin and Sora from the Imperium Train and escape with Riyu, who gave them a clue to his home, the Land of the Three Peaks, however Imperium follows them and attempts to capture Riyu's matriarch, and a clash begins.
Lloyd trains Arin and Sora, but they sneak out of the Monastery and go to the Crossroads Carnival, but Lloyd follows them and learns a shocking truth
While Lloyd is training his young students Arin and Sora in the Monastery, the Destiny's Bounty appears in the sky and scrapes past the ninja by a hair's breadth. But with a bold leap, the three of them, along with the dragon Riyu, make it onto the ship to look for clues. They dive straight into the Realm of the Madness
On their way back to Ninjago, our heroes encounter the Monks and browse through their archives, but suddenly a merge-quake occurs and the ninja are in great danger.
Sora tells the other ninjas about her invention: the Photec projection device. But if it falls into the wrong hands, it can wreak havoc. Therefore, Sora and the others decide to return to Imperium to destroy the Photec.
Lloyd encounters a new elemental master while Sora must choose between her past and the future of Ninjago.
To bust the imprisoned dragons out of Imperium, the Ninja will need to work hard, think fast and find one big exit.
Lloyd and Wyldfyre lead the assault on the Claws of Imperium with the freed dragons. Sora and Arin seek out Riyu to defeat the Photacs.
The ninja find allies to free the dragons of Imperium as Lloyd discovers a mysterious energy source beneath the city.
The Ninja settle into a new normal after their victory against the Imperium. Lloyd struggles to keep up with the responsibilities of being a Ninja, mentor, and master of the Monastery. They stop another MergeQuake, but the disturbances are getting more frequent. Nya's research guides them to a temple and three Dragon Cores that could stop the quakes for good. Meanwhile, Beatrix plots her revenge and plans to steal the Cores for use as a weapon.
The Ninja split into three teams to find the Dragon Cores that will end the MergeQuakes. Nya pairs with Sora, and Kai ends up with Wyldfyre. Lloyd and Arin head out on the Bounty, but a training mishap crashes them into the sea. To repair the ship, the Ninja must reclaim a floating village from an ocean gang and their monstrous pet crab, but the situation is not what it seems.
Wyldfyre and Kai barely escape another obstacle on their journey. Despite their personality clash, they finally reach the Wyldness. The Dragon Core is possessed by Lava-tides, who force the Ninja to clean up the mess Wyldfyre created when she lived here. Meanwhile, Zane needs a part to study the Monastery's teleportation gate and follows Mr. Frohicky into Crossroads where they are hosting a Zane Day celebration
To locate the yellow Dragon Core, Nya uses a Djinjagan spell that accidentally curses herself and Sora. They become the target of unstoppable spectral Howlers. Sora, the dragon, flies the Ninja to an old ally, Arrakore, the last of the Djinn, but he does not have the magic or the will to help. Back at the Monastery, Mr. Frohicky tries to prove his worth as an Assistant Keeper to Zane, but nothing seems to go right
All three Ninja teams near the end of their hunt for the Dragon Cores. Kai and Wyldfyre scramble for the purple Core against Dorama and the Lava-tides. Lloyd and Arin enter a trial for the pink Core with unexpected consequences. In the Valley of Lost things, Nya and Sora search for the purple Core but instead find an old friend.
Cole reunites with Nya to help her and Sora retrieve the purple Dragon Core in the Land of Lost Things. Unfortunately, the core powers a machine keeping Cole's new home with a group of young runaways safe from a monster hunting the land. Sora studies the machine with the help of a new Elemental Master. Back in the Wyldness, Kai teaches Wyldfyre how to treat Heatwave's burns and hopes the younger fire-user realizes she has more to learn.
Arin and Lloyd follow the stolen pink Dragon Core through a portal into the Administration. The Ninja navigate its maze of cubicles and bureaucracy, inadvertently rescuing Zane along the way. They track down the Core but have to lose an army of Agents if they want to escape. Arin also finds a clue in the continued search for his parents and meets a familiar face in the process. Meanwhile, Kai teaches Wyldfyre the importance of finding calm.
The Empress's rise to power is revealed through flashbacks as present-day Beatrix attempts to construct her new MergeQuake weapon. Deception from a minion delivers her a serious setback. All three teams of Ninja sneak back into the Imperium to retrieve the stolen Dragon Cores. They find help with unexpected allies and form a plan to infiltrate the labs. Unfortunately, they may not reach the Cores before Beatrix completes her weapon.
To expose Empress Beatrix's mistreatment of dragons to the naïve citizens of Imperium, the Ninja will need help... from a man on the inside.
Empress Beatrix's rampage pushes the MergeQuakes dangerously close to the tipping point, unless the Ninja can work together — and save the world.
Lloyd is plagued by nightmares while Lord Ras and Jordana seek to awaken a dark power from a lost age.
Ras attacks the Cloud Kingdom to obtain information on the Forbidden Five, Euphrasia informs the ninja and they set off to save the kingdom.
Cinder and Jordana compete for Lord Ras's favor, the ninja set out to find a teacher who can defeat the Wolf Clan, Wyldfyre sneaks on the Destiny's Bounty.
The ninja find 2 old dragon masters who agree to train the ninja, and Ras invades the Land of Lost Things.
Egalt teaches the Rising Dragon to the ninja, while Sora and Riyu learn Spinjitzu from Rontu, Cole reaches the Monastery with the Finders and sets off on an adventure with Zane.
Cole, Zane and Bonzle travel to Mysterium, only to fall in Dorama's trap. Rontu sees potential in Sora and Riyu, and Arin is frustrated.
Bonzle meets her creator Gandalaria and Kai becomes the third Dragon Master. The blood moon appears in the sky and the dragon masters are turned into statues.
Lloyd's visions lead the ninja to the Wyldness where they seek shelter in a mystical warehouse. Cole and Zane fight against the Administration and Agent Walker.
Cole, Zane and Gandalaria search for a release spell and obtain magical powers. The ninja rush to the Ritual of the Blood Moon to stop Lord Ras, Kai and Sora disguise themselves as Wolf Mask Warriors.
With the sacrifices, spell and Blood Moon in his control, Lord Ras has everything he needs to unleash the Forbidden Five — unless the Ninja can act fast!
Life at the Monastery isn’t the same for Wyldfyre since Kai got trapped in the Nether-Space. Her parent-dragon Heatwave knows how to soothe her rage: with a trip back home, to the Wyldness! After all, it’s the perfect place to be angry alone... or is it?
Wyldfyre knows she’s great at lots of things, but babysitting isn’t one of them. Just because she was raised by a dragon doesn’t mean she has any clue how to care for one (or three!). But Kai wouldn’t leave three little dragons to fend for themselves, right?!
Just when Wyldfyre thought things couldn’t get any worse, the baby dragons get lost in a crystal cave. Beautiful as it may be, things aren’t what they seem. With reflections all around, Wyldfyre can’t trust her own eyes and wait… what’s that hissing sound?
There’s light at the end of the cave! If the baby dragons stay calm now, this mission will be accomplished soon. Will Wyldfyre realise that she doesn’t need to do everything alone? It’s time to ask herself, “What would Kai do?”
While searching for his parents, Arin and the Ninja rescue a baby dragon, uncovering a new mystery and mission for the team.
The Ninja reach the gateway to the Tournament of Sources only to discover they have not been invited; Kai and Bonzle evade the remaining Forbidden Five as they try to escape the Nether-Space.
After earning invitations to the Tournament of Sources, the Ninja attend a banquet for Elemental Masters with friendly faces and old enemies, and Lloyd confronts a familiar face from his vision.
Arin continues his investigation into the missing horns but makes time for Frak, who Sora suspects is working for Ras; Nya's first match pits her against Jay, still with no memory of their past.
In her match against Cinder, Wyldfyre's temper proves a liability in and out of the arena; in order to stay in the Tournament, the Ninja invoke an ancient rule that requires them to compete in a race outside of Temple City.
Arin grapples with Ras's accusation that Master Wu caused the Merge while the Ninja complete the Temple Race and win their way back into the Tournament.
Arin follows a lead in his investigation of the missing horns to the Temple City Museum; a tour from Roby reveals a deeper connection between the Tournament and Source Dragons.
Roby and Blekt visit an injured Lloyd to complete the transfer of Zeatrix's powers; Arin links Bleckt to a clue in his investigation and follows him back to a secret office, where Wyldfyre has an idea to uncover his plans.
Arin learns a devastating secret about the Merge and confronts Lloyd as Cole stays behind to protect the dragon horns. Sora faces off against Nokt, and Wyldfyre is too late to stop the manipulation of the games.
Arin, Zane, and Cole make a shocking discovery in the Monastery of Gates as they defend the Dragon Horns; the depowered Elemental Masters clash with the Wolf Mask army.
The Forbidden Five travel to the Wyldness to awaken their ancient ally, while the Ninja seek guidance from Egalt and Rontu.
Ras plots to use Arin for his own gain, meanwhile the Dragonians rise from the Storm Village. The Ninja rush to stop the Forbidden Five.
Lloyd questions his leadership as the pressure of stopping the Forbidden Five intensifies. Meanwhile, Arin and Ras are on the run from Nokt.
The Ninja encounter Jay who taunts his former friends. Meanwhile, Ras continues to manipulate Arin, setting him on a path of no return.
The Ninja discover the existence of the Arc Dragon of Focus, the only being capable of stopping the Forbidden Five. Clues lead them to an ancient temple where they must solve puzzles to summon the Arc Dragon.
Ras intensifies his hold over Arin as the Ninja decode ancient texts in the Temple of the Storm. An old friend returns to the Ninja.
The Forbidden Five's plans advance and Arin has a moment of clarity but finds himself unable to act. PIXAL finds a clue to finding the Forbidden Five.
The Ninja learn how the Forbidden Five were once guardians of the Wyldness turned rogue. Arin reaches out to the Ninja secretly, trying to warn them about Ras’ true intentions.
The Ninja make a desperate attempt to summon the Arc Dragon and thwart the Forbidden Five’s final plans. Arin’s internal conflict reaches its peak as he chooses between Ras and the Ninja.
The Ninja, with the help of the Arc Dragon of Focus, engage in a battle to stop the Forbidden Five. Arin confronts Ras. Lloyd summons the Source Dragon of Motion at considerable cost.
