Jestro and Monstrox are nearing completion of their quest to find the final Forbidden Powers and bring the STONE COLOSSUS to life. NEXO Knight Clay has been turned to stone and Aaron steps up to become the leader of the NEXO-Knights. Merlok 2.0 is working hard on a series of Ultimate Combo Powers that he needs to defeat Jestro and Monstrox. Clay is hit with lightning by Monstrox and transformed into a great and powerful GRAY KNIGHT – a GRANITE WARRIOR with evil intentions. The NEXO Knights band together and fight for their Kingdom. Jestro and the Monstrox find the final six Forbidden Powers and bring the STONE COLOSSUS to life. It marches across the realm destroying everything in its path on the way to Knightonia. Robin finishes his super-secret project constructing a castle shaped rocket and also a MEKLOK for Merlok to destroy the Forbidden Powers in the Crown of Colossus. At this final showdown will the NEXO Knights be able to defeat the Colossus, destroy Monstrox, capture Jestro and restore peace for the Kingdom of Knighton once and for all?