The ninjas are snapped out of their post-hero complacency when Lord Garmadon's young son Lloyd shows up and tries to pick up where his father left off.

Back in training mode with the looming threat of Lloyd and the Hypnobrai, Zane wanders after a Falcon and lands himself in a heap of trouble.

Lloyd unlocks a second tribe - The Fangpyres - to help him regain control. The Ninja are busy setting up their new HQ that Zane discovered, but are called to duty when the Fangpyres attack the village where Jay's family lives.

After the Fangpyres join forces with the Hypnobrai, Lloyd awakens Pythor - the last remaining snake of the Anacondrai tribe. Pythor steals a map from him that will show him where the remaining two snakes tribes dwell.

Lloyd moves in and tries to make nice by helping out with chores, but he just gets in the way. Pythor has awoken the Vipoids and the Constrictaurs and an all out snake war has taken over Ninjago.

Pythor declares himself to be the destined leader who will reawaken The Great Devourer - an ancient beast who can't be killed and will consume all of Ninjago.

When the four ninja follow the mysterious falcon into the woods, they stumble on a hidden work shop where Zane learns the secret about his past and in the process, he is the first ninja to unlock his true potential.

Jay and Nya have to cut their first date in Mega-Monster Amusement Park short as the Serpentine are on their way to retrieve the first of four fang blades to be used to awaken the Great Devourer.

The four ninja go undercover as a dance troupe and enter a talent contest in their quest to win "The Blade Cup" where one of the fang blades is hidden.

When Garmadon moves in to search for Lloyd, the ninja learn that they must work together to find him. It is believed that the green ninja will be Lloyd.

When the ninja are captured trying to find the Serpentine's inner sanctum,and Lloyd's rescue mission fails; It's up to Garmadon to save them.

As Pythor is preparing to finally unleash The Great Devourer, the ninja are in a race against time to the lost city of Ourobouros.

Disaster threatens as the ninja must fight to defeat the all consuming Great Devourer in a desperate attempt to save Ninjago.

The ninja's new mission is to train Lloyd and they find a place to begin the training. Meanwhile Lord Garmadon enslaves the serpentine into turning the wreckage of the Destiny Bounty into his new ship.

Lord Garmadon brings the pirates of Destiny Bounty back to life, but they take over the new Black Bounty and attack Ninjago City. While the ninja defend the city, Lloyd unlocks his spinjitzu power.

When our heroes are invited back to Darkly's Boarding School, they discover it's a trap set up by Lord Garmadon and his evil replica ninjas created by Garmadon's new Mega-Weapon.

When the ninja learn that Darreth's Mojo Dojo is to be destroyed and Darreth doesn't have the money to save it, our heroes enter the annual NinjaBall Run to win its cash prize in order to save the dojo.

When the Ninja interrupt Garmadon from using his Mega-Weapon to 'turn back the clock' and bring to life the fossils of a monster, the Ninja are hit and turned into kids and are now forced to enlist Lloyd's help to battle the awakened monster.

When Garmadon travels back in time in order to undo the past and rid the Ninja from the future, the Ninja follow him and try to stop him by using the Golden Weapons from the past to clash against Garmadon's Mega-Weapon.

The ninja face off with an exhibit of a Stone Samurai Warrior that the toxic venom from the Great Devourer has brought to life while Garmadon manages to find a fabled Dark Island that is said to hold dark powers.

The ninja try to flee from the rest of the Stone Army that has been brought to life by the Devourer's toxic venom - and things get a lot worse when Garmadon arrives with a 'Helmet of Darkness' and seizes control of the Stone Army.

The Ninjas, Lloyd, Sensei Wu and Misako journey to the Dark Island to find a 'Temple of Light' that can restore the Ninjas' elemental powers but are attacked by Starteeth (barnacle-like star fish) that start eating through their ship.

After battling off Garmadon's Stone Army, the Ninjas finally arrive at the Temple of Light where they harness their pure elemental powers, concentrating them onto Lloyd who becomes more powerful than he ever imagined.

When the Ninjas' attempt to return Garmadon's 'Helmet of Darkness' to its perch at the Celestial Clock in order to prevent the final battle between Lloyd and his father from beginning fails, a Super Weapon is created that can destroy all of Ninjago.

Garmadon's ultimate weapon, the Garmatron (Which in effect is a giant Cannon), is completed. The Overlord, the Stone Army, and Garmadon drive the vehicle to the coast of the Dark Island, but not before testing it out on Nya. The Ninja pursue Garmadon to the coast, and discover that Nya has turned evil, gaining all of Garmadon's dark abilities in the process. Kai, Jay, Zane, and Cole stay behind to deal with Nya, while Lloyd, Misako, and Sensei Wu rush to stop the Garmatron. They fail, and Garmadon turns Jamonkai Village, and the town around Four Weapons evil. The shift in the balance of good and evil allows the Overlord to poccess Garmadon's body and begin to transform into his original form. Lloyd challenges him, but is injured in the resulting battle. The Overlord attempts to turn Lloyd, Wu, and Misako evil with the Garmatron, however the Tinkerer appears in Destiny's Bounty, and crashes it into the missle before it hits them. The whole Stone Army and the Overlord create a portal to Ninjago City, and head there to turn the rest of Ninjago evil. With the Destiny's Bounty now destroyed, the Ninja have no way to get back accross the sea and stop them.

Time is running out for the ninjas as the Overlord have reached Ninjago city. However, the ninjas, Sensei Wu, Misako and the Tinkerer are still unable to return to Ninjago.