When the ninja connect Jay's disappearance to Prime Empire, they set out 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 and enter the game themselves.
Now inside the Prime Empire game, the ninja find themselves in unfamiliar territory, ignorant of the rules of this world, as they try to find Jay and escape Unagami's 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, causing him to lose all hope - until some familiar ninja arrive.
In order to stop Unagami, the ninja must obtain three Key-tanas, the first of which is hidden in the game zone Terra Karana - one of Prime Empire's most dangerous game environments.
Still in the game zone Terra Karana, the Samurai guide Okino has to chose between helping his allies the ninja, or obeying the evil orders of his Master, Unagami.
Unagami breaks into the real world and terrorizes Ninjago City while Jay, Zane and Pixal attempt to prevent disaster by reuniting Unagami with his creator, Milton Dyer.
Cole escapes a nest of Dire-Bats only to find himself face to face with a giant spider. Luckily, help arrives at just the right moment from an unexpected source.
Princess Vania attempts to catch the falling Master Wu and Cole, but their combined weight tears her wings loose, plunging the group into the mountain.
Cole awakens from a dream to find himself surrounded by Master Wu, Princess Vania, and a dejected group of adventures that call themselves the "Lowly.".
Cole and the Upply arrive at the Skull Sorcerer's Keep to find the rest of the ninja are locked in cages and the Geckles and Munce have been put back to work mining Vengestone.
As Cole and the Skull Sorcerer face off, the Geckles and Munce storm the Keep. Plundar frees the rest of the ninja from their cages, who rush to join the battle.
