After a mysterious event known as The Merge reshuffles the universe, an aspiring Ninja teams up with a smart techie to navigate a new and unfamiliar world. 

Having escaped Imperium, Lloyd takes Sora and her winged friend back to Ninjago where he begins preparing them to be the next generation of Ninja.

At a strange carnival, Lloyd discovers he's not only training Sora and Arin; he's also training a very large, devious and nightmarish creature.

In the Land of the Dead, a hard bargain brings Sora face-to-face with an old friend; former foes help the other Ninja hatch a plan to find Lloyd.

In Imperium, Lloyd and Arin learn about the Source Dragons but the Empress has evil plans; in Crossroads, Sora finds a lead on rebuilding the Bounty.

When the Ninja meet their match in a Photac -- an indestructible techno-beast -- Sora believes that a mission to Imperium is the only way to destroy it.

In Imperium, Arin mentors a group of eager young crime fighters; Sora confronts a villain from her past; Lloyd frees an Elemental Master from prison.

To bust the imprisoned dragons out of Imperium, the Ninja will need to work hard, think fast and find one big exit.

Sora hacks into the Imperium logs to find Riyu; Nya and Kai explore a mysterious passageway; Lloyd leads an epic battle against an army of Photacs.

Kai and Wyldfyre fight during a rescue mission; Nya goes solo to help an old friend; Lloyd trains Zane to fight a creepy sorcerer.

The Ninja start their search for the Dragon Cores with three teams heading out in three directions, but they aren't the only ones on the hunt.

At sea, Nya and Sora cross paths with Bonzle and Mynax; on land, Lloyd and Arin use their wits to escape a sticky situation.

Mr. Frohicky and Zane head to the Crossroads to locate a Wyconium coil; elsewhere, Wyldfyre's pranks complicate her and Kai's Dragon Core quest.

In a decaying town, Nya, Sora and an old friend try to outsmart a thief; Lloyd and Arin trail a mysterious elemental master with a connection to the Djinn.

Arin and Mr. Frohicky venture into a mysterious cavern with an ancient artifact; Nya and Sora help a friend in need.

In the Land of Lost Things, an old dragon master may hold the key to finding the Dragon Cores; but getting the information won't be easy.

Lloyd and Arin arrive in the Administration, where they learn the Dragon Core will be demolished if they don't act fast and file the correct paperwork.

While the Ninja try to figure out a way to bypass Imperium's energy barrier, Empress Beatrix tests a deadly weapon powered by stolen Dragon Cores.

With Imperium on the brink of collapse, peace is finally within reach; but an old enemy returns to thwart the Ninja's plans.

The Ninja face the full power of the Empress and the Mechanic; time is running out to stop Imperium from unleashing its catastrophic weapon.