The Book of Monsters tries to take human form, and the Knights and Merlok 2.0 try to stop the threat.

The kingdom is threatened by an army of Lava Monsters, and the inexperienced NEXO Knights must come to the rescue.

The Cloud of Monstrox and Jestro unlock a mysterious forbidden power; Merlok 2.0 and the NEXO KNIGHTS try to make the new COMBO NEXO Powers work.