The Cloud of Monstrox grows more powerful with every Forbidden Power Jestro inserts; the capitol of Knighton is under attack; the Fortrex is damaged and Clay is turned to stone.

The three Harpies have kidnapped Macy's mother Queen Halbert, and the Nexo Knights use everything in their power to rescue her.

The old Lava Monsters are back and a Forbidden Power is in the middle of their new village of Burningham! But whose side are the Lava Monsters on?

At K.O.M.A. (Knightonia Official Museum of Art) Monstrox learns that a Forbidden Power tablet is hidden and he will do anything to get it; especially if King Halbert happens to visit at the same time.

Villagers are being enslaved to dig out three ancient warriors whom the Cloud of Monstrox wants to bring back to life. Can the Nexo Knights make their Combo Nexo Powers work inside a mountain?

The Nexo Knights have their powerful shields stolen by Robot Hoodlum and his Merry Mechs; something is coming to life in the petrified forest and it doesn't like knights.

Jestro and the Cloud of Monstrox unleashes the Forbidden Power Ravaging Rot on Knighton, turning everything into green gooey rot, but Robin has an awesome new invention that could help the Nexo Knights.

Jestro and the Cloud of Monstrox encounter the sculptor who helps unleash a horde of fierce garden gnomes on Knighton.

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.

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