When the ninja try to return home to Ninjago from the land of the Oni and the Dragon, something goes wrong and they end up in Knighton. Meanwhile the knights are still recovering mentally from the attack of the collosus and now have to figure out a way to help the ninja back home.

-Spoilers for Game of Masks!- You remember that big fight Harumi and Lloyd had? Well, what if Lloyd decided to join Harumi's side because he missed his father and he loved her so much? It shocked all of the ninja when they saw Lloyd wearing that Mask of Betrayal.

After the defeat of the Book of Monsters, everyone thought life was back to normal for the better. But when Clay, Jestro and the knights start having terrible nightmares, they realise that destroying the one thing that held the soul of Monstrox may have unleashed something dangerous.