In the wake of Overlord's defeat, Ninjago City is reborn and the ninjas teach at Sensei Wu's academy. But the peace doesn't last long.

After being pursued to Sensei Garmadon's monastery by the Nindroids, the ninjas sneak back into Ninjago City under the guise of a circus train.

Zane gives up half his power to save P.I.X.A.L. just as foes attack from all sides. Meanwhile, Lloyd and his father travel to Hiroshi's Labyrinth.

Underneath Ninjago City, the ninjas discover secrets about the Serpentine when they fight alongside them against the Nindroids.

The ninjas venture into the Digiverse to confront the Digital Overlord. Meanwhile, Pythor and Wu lead a Nindroid attack on Borg Tower.

Pythor and the Nindroids free the Digital Overlord. Meanwhile, Wu and Garmadon stumble upon Pythor's top-secret scheme, Project Arcturus.

After battling Nindroids on the outside of the Arcturus ship, the ninjas hang on as the craft takes the battle into the heart of a comet.

The Nindroids use the Golden Weapons to transform the Overlord into the Golden Master. In the ruins of Ninjago, the ninjas prepare their final stand.

After discovering that Zane may still be alive, the ninjas learn that they must compete in a Tournament of Champions if they wish to see him again.

The team learns about Jade Blades and other secrets of the Tournament of Champions. Karlof is eliminated from the competition.

The contests begin, and soon Cole is forced to battle with Jay. Zane regains his memory with help from P.I.X.A.L.

The remaining Elemental Masters compete in a roller skating competition. Cole, Karlof and other eliminations must work in Chen's noodle factory.

The ninjas form an alliance with the Elemental Masters after revealing Chen's plan. Cole and Zane break out of the noodle factory.

Lloyd and Garmadon learn of the great battle that once took place between Chen, the Anacondrai and the Elemental Masters for control of Ninjago.

It appears that all is lost when Chen drains the powers of the Elemental Masters and vanquishes Lloyd in battle to take control of his as well.

Chen and his army invade Ninjago City, but the masters have escaped the noodle factory and follow close behind. Garmadon narrowly escapes banishment.

Master Chen uses a spell to turn himself and his troops into fierce Anacondrai, but the ninjas visit Ninjago City's jail to recruit an unusual ally.

The final confrontation between the ninjas and the Anacondrai unfolds, but a great sacrifice must be made if the heroes are to save the day.

Morro possesses Lloyd and uses him to infiltrate the tea shop and attack the other ninja, who have mysteriously lost their powers.

After learning that Wu's staff holds a clue to the First Spinjitu Master's tomb, the ninja go to Stiix to retrieve the stolen Airjitzu scrolls.

While Wu trains Nya in her new water powers, the ninja plot to steal the Airjitzu scrolls from Ronin but find that they must first fight Morro.

The ninja go to Sensei Yang's dangerous haunted temple to learn Airjitzu, and Nya quits her training but must use her powers to elude Morro's ghosts.

Using their new Airjitzu powers, the ninja race to climb a perilous mountain to find the Sword of Sanctuary before Morro can claim it.

After being betrayed in the Cloud Kingdom, the ninja battle Morro for the Sword of Sanctuary and learn he is ultimately after the Realm Crystal.

As the ninja close in on their final clue to the location of the First Spinjitzu Master's tomb, Ronin steals the Sword of Sanctuary to give to Morro.

The ninja journey to the First Spinjitzu Master's tomb to claim the powerful Realm Crystal, but they must navigate a series of traps -- and Morro.

As the ninja race to keep Morro from releasing the Preeminent, Morro uses the Realm Crystal to summon an army of ghosts from the Cursed Realm.

While the ninja try to protect Stiix, Lloyd encounters his father in the Cursed Realm, and Nya unlocks her true potential to take on the Preeminent.

The ninjas find themselves going from famous heroes to hunted villains when someone impersonates them and commits crimes all over Ninjago City.

While Nadakhan schemes to steal the Realm Crystal, the fugitive ninjas are pursued by Ronin, who has been hired by the police to track them down.

Falsely imprisoned, the ninjas meet a fellow captive who knows of a rare venom that can stop a Djinn like Nadakhan, but it's only found on one island.

Nadakhan talks Jay into making a wish to win over Nya, first mate Flintlocke accidentally destroys the Realm Crystal, and Cole steals Soto's map.

As large areas of Ninjago City vanish, the ninjas head to Tiger Widow Island, where Jay collects the precious venom with Nadakhan in hot pursuit.

Marooned on Tiger Widow Island, Lloyd, Cole and Nya try to escape on a raft, while a captured Jay battles Nadakhan's crewmates for their amusement.

After lessons in how to talk like pirates, the ninjas infiltrate Nadakhan's ship on a mission to slip him the venom and rescue Jay from captivity.

Flintlocke leads a mutiny, believing Nadakhan will abandon his crew once he has the power of infinite wishes, but the Djinn prevails and captures Nya.

While Nya is forced to rehearse for her wedding to Nadakhan at the Djinn Temple, Jay recruits a new team for a mission to rescue his friends.

Nadakhan marries Nya and gains the power of infinite wishes, but Flintlocke and Dogshank join the ninjas to fight the Djinn in an epic final showdown.

Master Wu engages in a fight left unfinished decades ago against Acronix, one of the twin Hands of Time. The ninjas try to rescue him.

The ninjas learn more about fallen Elemental Masters, Krux and Acronix, and discover they have a new enemy.

Kai uses a Vermillion Warrior helmet to uncover information about Krux, while Lloyd struggles as a master-in-training and Nya tries to reboot Zane.

The Vermillion Warriors mysteriously steal items made of metal while Lloyd comes to realize that filling Master Wu's shoes is a daunting task.

The ninjas fight to save an amusement park while Jay defends his family home from the Vermillion Warriors -- until the Emerald Time Blade arrives.

The team enjoys a victory and retrieves the Emerald Time Blade, but the celebration is short-lived.

While the rest of the ninjas try to find and rescue Master Wu, Nya confronts the Samurai X imposter and Kai seeks the truth about his parents.

Kai discovers both of his parents are being held captive. Meanwhile, a third Time Blade appears.

The Hands of Time force Kai and Nya into retrieving the fourth Time Blade from the Boiling Sea.

Kai and Nya time travel to the past, where they must help the Elemental Masters prevent the Hands of Time from changing Ninjago history.