LEGO Nexo Knights - Season 4

The Cloud of Monstrox and Jestro are able to unlock the forbidden Power Shocking Scare and unleash an attack on the village of Bravington. Knights in their new vehicles rush to the rescue and are able to defeat him with a new Combo Power. In the heat of the battle, the Cloud of Monstrox sees the stone statue of Clay and zaps him to life! Clay is now turned, and is fighting against his friends. It is impossible for them to defeat him without destroying him for good. The Cloud urges Clay on. He attacks the Fortrex in order to get to Merlok. Robin in his Black Knight Mech is trying to stop him, but to no avail. Merlok 2.0 is left undefended. At the very last moment, Merlok 2.0 unleashes a blasting spell that sends Clay far far away.

Clay as the Gray Knight wakes up far away in a place called Nothing Hill. A poor town where they literally have nothing. They harvest dust. Jorah Tightwad though has found that there is gold underneath the town. He convinces the confused Clay to help him put pressure on the poor townsfolk to give up their lots. This is an easy job for the strong Gray Knight. The NEXO KNIGHTS finally track him down and tries to convince him about who he is. But to the Gray Knight they are still his enemies, and a giant battle ensues in order to subdue the Gray Knight. At last, only Macy is left. When she begins to recite the Knights Code, some words and their meaning are able to get through the stone hard shell of the Gray Knight and the Evil that clouded him seems to disappear. Together they are able to return the ownership of the town to the villagers.

Since the Cloud of Monstrox and Jestro are unaware of Clay's situation, the NEXO KNIGHTS decide to let Clay go undercover and infiltrate the Stone Stompers. Clay gets the help of Jack Shield who is his majesty's secret agent who is a specialist in infiltration and espionage. Clay has to undergo hard training in how to remain silent and unnoticed. Which is quite a challenge for a man in armor plates. Robin is intrigued by all the cool agent gadgets and follows Clay from a distance. Hidden. Clay convinces Jestro and the Cloud of Monstrox that he is still very evil, Jestro spills their master scheme of using the Forbidden Powers to unlock the Stone Colossus. They find Robin spying around outside their camp and Clay has to get rid of him. However Clay lets him go, and his cover is blown and he gets captured by General Garg. Luckily, the Nexo Knights in their Battle Suits has been following along not far away ready to intercept. Now is their moment. They manage to free Clay and fight the Stone Stompers. In that fight, Clay is going "berserk" and the Knights are a bit shocked by this new chaotic behavior. When he fights Ruina (Witch) something holds him back. And we are left with wondering how that can be.

The Gray Knight ambushes some more of Jestro's monsters and uses a COMBO NEXO to destroy them. He's very, uh, vengeful. But this is his, cold, stony mission – seek vengeance for the good of the Kingdom. Macy misses the "old" Clay. They gentle, but just, knight. Meanwhile, Jestro and the Cloud need more minions and fast! They find the FORBIDDEN POWER of DEVIOUS DEMOLITION. They use to wreck a village and then Arnoldi chisels faces onto rocks, pillars, debris, etc. Then the Cloud of Monstrox brings them to life with his evil, zapping lightning. Now Jestro has a quick, make-shift army. Lance says they shouldn't worry; the "Avenging Gray Knight" will just turn Jestro's army into gravel again. But Clay is nowhere to be found. He's gone off into the wilderness to "commune with the rocks." Merlok 2.0 is quite worried about him. Forced to deal with Jestro's makeshift army, the Knights come across the Big Rockowski; he's a legendary demolition expert and slacker rock monster. Rockowski lives in the Halps – the big mountain range in the kingdom – and really doesn't want to be bothered about stuff. He's been living peacefully in a little valley with his pet rabbit, Bunny. But now the Knights need him (the COMBO NEXO Triangulator is down…again) so they need his demolition skills. He's not sure he wants to help until Bunny's entire family – of many rabbits – show up at his rocky plateau in the Halps. Jestro has destroyed their forest. And, to make matters worse, the Cloud turns one of Rockowski's favorite boulders into a monster. Rockowski agrees to help the NEXO Knights if they can get that big rock that Jestro turned into a monster back. (It's the rock that tied "the whole room together.) The NEXO Knights agrees and Rockowski uses his demolition skills to help trash Jestro's army – including using his favorite wrecking ball, Donny. They drive off Jestro and his Army, but Donny is broken. The NEXO Knights keep their promise and help replant the forest for Bunny (Ava has created a tree-planting algorithm.) Meanwhile, the Gray Knight trains and plans among a desolate landscape filled with rocks. Clay has changed; he's now the avenging Gray Knight and he will make his enemies pay. In the end, Jestro's locks in the Forbidden Power of Devious Demolition at Mt. Thunderstrox…this is a scannable moment.

Always afraid to end up poor, Jorah Tightwad is digging up a large portion of his property near his castle to build a vault for his money. "I can rent it out to other people as well to store their money and then I'll just keep their money. That's a quality business model." "The interest will eat up their savings and I'll just keep it." What the Tighty Knighties – who Jorah's now employed to dig this vault since their last album bombed – find as they dig is a whole bunch of STONE WARRIER STATUES. There's even a statue of their leader, GENERAL CRACKENSKULL (a very cool Stone Knight on a Hellhound.) Jorah's advisors – two twin squirebots, LOTTA BUDGET and LOTTA FUNN, advise him to "sell the statues" and to "have fun with the statues." Lotta Budget prevails and Tightwad decides to sell them to Jestro and the Cloud of Monstrox, who, he's heard, need an army. Jorah gets gold – which Jestro pillaged from some nearby towns – and the Cloud brings the Stone Warriors and Krakenskull to life! (They promptly steal back the money Jestro paid Jorah AND make off with all the other money in Tightwad's vault!) Jestro and the Cloud use Krakenskull and his warriors to track down the Forbidden Power of CRACKING QUAKE. They then use this power to… attack the NEXO Knights! With Crackenskull and his warriors, the Knights are almost overwhelmed until…Clay returns! (He was wandering around, finding himself and training as the Gray Knight in Episode 405.) But now he's back with a vengeance and the Gray Knight drives them off! He saves the NEXO Knights and tells them that he will get his ultimate revenge on their enemies. He will utterly destroy Jestro, the Cloud, and ALL the monsters! (Aaron calls him "The Determinator" because he's so determined.) During Clay's attack, Ruina Stoneheart gives him something: Monstrox's "charm" bracelet (minus any forbidden powers) seen in episode 310. It seems to make Clay even stronger (she's tempting him to join their side).