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.

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

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.

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.

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?

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.

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?

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

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.

When the Nexo Knights are sloppy in a fight with Jestro, Merlok 2.0 sends them back to the Knights' Academy. Not only for a brush-up but to find out what Jestro is after in its hallowed halls.

When Jestro uses the Book of Greed to rob Auremville of its riches, he also gets Lance's parents as prisoners and these demanding rich folks are too much for even monsters to handle.

The Knights are tasked with protecting the King's valuable Ned Knights comic book during the Bookingheim Knight-a-Con. But with all the costumed kids there, will they recognize the real Jestro and Book of Monsters coming to get them?

Rival to the King, Jorah Tightwad thinks his knights, the Tighty Knighties, are easily better than the Nexo Knights, so he challenges King Halbert to prove who's better during the King's Birthday Tournament.

Axl and Chef Éclair must enter a cooking contest to try to keep Jestro from getting the hottest chili recipe in the realm.

When the other Nexo Knights decide they need a vacation from Clay, they send him on a holiday not knowing he's going to a resort that houses an evil book or that Jestro will be heading there too.

The Book of Monsters catching a cold means trouble for the Nexo Knights when he can create an entirely new kind of snotty monster.

The Book of Betrayal leads Jestro and his Monsters to Funnyton, the funniest town in the kingdom. When they Knights arrive to capture him, they discover to their shock that Jestro and the Book of Monsters are now the town's top comedians!

In a massive chase around Knighton, the Nexo Knights attempt to keep the Book of Betrayal out of the Book of Monster's grip. But the evil book is persistent. Will he get the final piece of his evil puzzle?

The Book of Monsters, having the final pieces of his evil plan in place, tries to take human form. Can the Nexo Knights and Merlok 2.0 stop the greatest threat they've ever faced? Or will the kingdom be plunged into darkness forever.

During the graduation ceremony for the new Knights of Knighton, Jestro the jester is ridiculed for his terrible, uh, jestring. Distraught, he's seduced by the powerful and evil Book of Monsters until Merlok the Magician tries to stop Jestro by using his most powerful magic spell.

After a magical explosion, Jestro discovers that he still has the Book of Monsters and together they decide to attack and destroy the Kingdom. Their monsters seem like too much for the new Knights of Knighton until an old friend emerges in a new form.

When Jestro and the Book of Monsters start using their monsters to ravage the countryside, the Knights get an awesome new HQ to fight him, the mighty, powerful Rolling Castle known as the Fortrex.

Clay and Lance tussle over who should lead the Knights and protect the King who's toddles off on a PR tour of the kingdom. While fighting off Jestro and his monsters, Lance realizes that nobody knows the Knights' Code like Cla.

The Knights explore a strange forest looking for a Book when Jesto unleashes the Book of Fear on them and a new monster, Whiparella, uses her minions to induce the Knights' worst knightmares.

When Lance stars in a movie about the Knights, the Book of Monsters want to eat the script to learn more about modern society. Jestro uses his spy, Lavaria, to infiltrate the set and attack the Knights.

Jestro and the Knights are both trying to get the Book of Deception. But the book has used its powers to create a powerful maze in the Hill Country, near Axl's home, and it's a race to complete the maze and get the Boo.

When the Knights of Knighton can't defend the outer villages of the kingdom, a mysterious Black Knight appears to take on Jestro and his monsters. Who is he really and is he a new ally or a new foe?

Jestro uses the baddest book yet, the Book of Destruction, to make monsters that capture the Knights one-by-one so that he can turn his attention to attacking the King's Castle.

Seeing Jestro's monster army about to destroy the King's Castle, Aaron rides off to gather his cohorts. In the meantime, the King and Queen bravely go out to defend the city against the monster menace. Is this the end of Knighton?

The knights arrive to save a village under early morning monster attack. The knights are pushed back by the many evil creatures, but Merlok 2.0 sends them NEXO Powers. With the upgrade the knights defeat the monsters and back in Knightonia King Halbert tries to read them a boring speech. Luckily the knights are called out to save another village.

After yet another defeat Jestro thinks back on his life and all he did before he became bad. We see him try to be a wizard, a knight and, of course, a jester. The Book of Monsters starts training Jestro in evil and they attack a village. The knights arrive to fight and soon have Jestro and the Book of Monsters on the run.

Clay takes a walk in the forest. Monsters follow him. He thinks back to when he was young and started dreaming of becoming a knight and did his first heroic act. The monsters attack him, but he thwarts their attack and defeats them easily. Macy and Aaron are mad he got in a fight without them.

Lance is going to a movie premiere with the King and Queen and Lavaria is also sneaking around. Clay calls from a battle and Lance must run off to help him and the other NEXO KNIGHTS heroes. Mid-battle Lance realises that it is a trick to lure him away from the King and Queen and he returns to the premiere just in time to save the day.

The knights are getting ready to eat, but the monsters have infiltrated the Fortrex kitchen and attack. The knights start fighting them, but Axl just keeps eating. Until they destroy his food. Axl gets an upgrade from Merlok 2.0 and launches himself on a food fight rampage. When he is done he demands dessert.

Lance is annoyed that people think Clay is more chivalrous than him, so he goes off to train himself in the values of a knight. He kind of succeeds through the NEXO Power ‘Champion of Chivalry’, but also demonstrates his complete lack of understanding of the whole thing. Besides the part about the shiny armor that is.

Aaron is at the Joust Games and has to do a perfect 10 run in under a minute to win. But in the middle of his run the monsters attack. Aaron powers up on NEXO Power and defeats them, but comes in at over a minute. Luckily the judges give him unprecedented 11s and Aaron triumphs again.

Macy tests a new floating camera Ava invented and uses it to make a video blog about her life. She trains with her punching bag, promises her mom to behave at the royal ball later and almost helps Chef Eclair, but is called off to battle. She successfully fights Lavaria, but has to run off to get to the gala where she arrives in a royal mess.

Robin wants to join the NEXO KNIGHTS heroes in battle, but he is too small. Robin starts developing extra legs to make him taller and ends up developing the powerful Ultra Armor. The knights use the ultra armor to defeat the monsters even more easily than before. All cheer Robin's great idea.

Clay wants to train in the Holo-gym, but it is on the fritz and in total chaos. Merlok 2.0 calls on the NEXO Power ‘Broom of Doom’ and cleans the whole place up in just a second.

Aaron is searching for his shield while Macy moans about him for always making a mess. Two scurriers have stolen the shield, but through the NEXO Power ‘Remote Control’, Merlok 2.0 beats them both up and brings the shield back to the Fortrex.

In the middle of a pie-eating record attempt Axl is attacked by monsters. While defending the innocent he upgrades with the ‘Shark Attack’ NEXO Power and finishes both the monsters and his pile of pies just in time.

Ava and Merlok 2.0 are trying to get all the NEXO Powers organized, but it is proving difficult. Merlok tells a story about the old kind of magic he used to practice, but Ava pulls him back to reality and shows him how the new kind of NEXO Powers that upgrade the NEXO KNIGHTS heroes and help them defeat Jestro are much, much cooler.

Jestro and his monsters are attacking a village and KNN are there to cover it. For a short while Macy is in trouble, but then she gets the Royal Brawl upgrade and beats up the monsters. It is the first time ever a NEXO Power upgrade has been caught on camera and Herb Herbertson is excited