While investigating a heist, the ninjas discover a legendary unreleased arcade game that suddenly takes control of all the other games in Ninjago.

When the ninjas connect Jay's disappearance to Prime Empire, they head to Dyer Island to seek answers from the game's designer, the elusive Milton Dyer.

Cyrus Borg discovers a shocking secret about Prime Empire, while the ninja battle an escaped Mechanic in their attempt to reach Level Thirteen.

Now inside the Prime Empire game, the ninjas find themselves in unfamiliar territory as they try to find Jay and evade an army of Red Visors.

Inside one of the game zones, a samurai named Okino faces a crisis of faith when he repeatedly fails to lead a series of masters to victory.

In order to stop Unagami, the ninjas must obtain three Key-tanas, the first of which is hidden in one of Prime Empire's most dangerous game environments.

While trying to cheer Okino up, the ninjas arrive at the Cliffs of Hysteria and must figure out how to climb them.

Still in the game zone Terra Karana, the samurai guide Okino has to chose between helping the ninjas or obeying the orders of his master, Unagami.

The ninjas learn that the only way to acquire the second Key-tana is by winning a race in Terra Technica — and must find racing cars in unexpected ways.

As the ninjas prepare for the brutal Speedway Five-Billion race, Lloyd meets a race driver named Seven — who may hold the key to victory.

Unagami's soldiers, the Red Visors, finally discover the secret location of Scott's garage — where they stage an attack against the ninjas.

The ninjas barely have time to mourn the loss of their fallen friends before being thrust into the chaos of Terra Domina.

Back in Ninjago City, Zane and Pixal hit the mean streets to track down Milton Dyer, only to discover that things are not what they seem.

Zane, kidnapped by the Mechanic, faces Unagami while Pixal questions Milton Dyer for information on how to shut down Prime Empire.

Jay must stand alone against Unagami in the end-game. But Unagami has a bigger battle in facing the truth about his own identity.

When Unagami breaks into the real world and terrorizes Ninjago, Jay, Zane and Pixal attempt to prevent disaster by reuniting him with his creator.

The ninjas travel to attend the birthday party of Princess Vania, in the distant Kingdom of Shintaro, and bring along Master Wu.

The ninjas are welcomed to Shintaro, where Cole and Princess Vania investigate a mysterious visitor and explore a secret underground mine.

The ninjas attempt to rescue Cole, but the bickering of his fellow prisoners alerts the Skull Sorcerer, and soon the ninjas are prisoners too.

In order to escape the Skull Sorcerer's chain gang, the ninja must convince the Munce and Geckles to put aside their distrust and work together.

Separated from the others, Nya, Jay and Lloyd follow a Munce named Murt deep into the mountains, where they meet the Munce Queen.

Kai and Zane discover a party of Geckles, who suspect them of working with the Skull Sorcerer and bring them to their leader, Chancellor Gulch.

Cole must trust his instincts and make the right choices to find his way to the surface and alert King Vangelis of the dangerous Skull Sorcerer.

Princess Vania tries to catch the falling Master Wu and Cole. But with too much weight on her wings, they find themselves plunging into the mountain.

Having survived their fall into the mountain, Cole, Wu and Princess Vania befriend a motley group of survivors called the Lowly.

Cole leads the Lowly, Princess Vania and Master Wu in a series of fruitless efforts to find a way out of the inescapable Rock-Bottom.

Nya and Kai attempt to bring the Munce and Geckles together in an effort to defeat their mutual enemy, the Skull Sorcerer.

Pursued by a magma monster, Cole, Princess Vania, Wu & the Lowly arrive at a mysterious temple deep in Shintaro Mountain.

The ninjas, the Munce and the Geckles take refuge in the Geckle Strong-Cave after they're all forced to flee by the Grief-Bringer's arrival.

Cole, the Lowly, Princess Vania and Wu learn that the stone-mech is powered by Elemental Earth energy and use it to blast their way out of the mountain.

Cole and the Upply arrive at the Skull Sorcerer's Keep and find the ninjas locked into cages and the Geckles and Munce back at work in the chain gang.

As Cole and the Skull Sorcerer face off, the Geckles and Munce storm the Keep. Plundar frees the ninjas from their cages so they can join the battle.