The ninja contact old allies to prepare for the final challenge against the Diamond King. Our heroes also receive help from unexpected comrades-in-arms and new powers. Meanwhile, Master Wu and Misako have difficulty deciphering the scroll. Lloyd gives Garmadon a chance to show that he has changed. Can the ninja take dragon form and combine their Spinjitzu weapons? And will they be able to defeat the Diamond King to save Ninjago?

The ninja come up with a new strategy against the Diamond King's army. Garmadon tries to teach Lloyd the Oni form. Garmadon also has to show that he has changed. Meanwhile, the Diamond King unleashes his dragons on the flying ship. Master Wu sets up a refuge in a newspaper warehouse. There he tries to decipher a mysterious scroll and sends a message of hope to Ninjago. Will our heroes be able to rally against the threat of the Diamond Army?

Lloyd was able to uncover the secret of who was behind the Kabuki mask. But it's not just this that surprises him and the ninja: the true identity of the Diamond King also awakens memories of past adventures. Meanwhile, the Diamond King's council prepares a ritual to transform the weapons of Spinjitzu into weapons of evil. Furthermore, a trail leads to a mysterious ally... Who is behind it and will the ninja be able to defeat the Diamond King's army?