Ninjago: Masters of Spinjitzu: March of the Oni - Season 10

Lord Garmadon is onboard Destiny's Bounty with the ninja, much to the consternation of the heroes. Lloyd finds that his father no longer has any emotional connection to him or ability to remember the relationship they had forged. Lord Garmadon says that the Oni are using the Realm Crystal, currently housed in Borg Tower, as a means of entering the world and it must be destroyed. Being Oni himself, he is the only one who can do it. Lloyd insists on going with him.

The Monstrox Colossus attacks the city! The entire city has turned out for defense as Robin continues his secret project in Merlok's Tower at the castle. He's using some of the Knightmares Team from the Academy to help. The King and Queen and Brickland and Sir Griffiths are seeing to the city's defenses - all being coordinated by Clay from the Fortrex. He's more driven that before (and, showing off touches of his magical talents.) Meanwhile, Ava is trying to get some programming done; with Techcalibur having been damaged (in Episode 310) she must find a way to transfer Merlok in an emergency. As Jestro and Mergana arrive with a horde of monsters arrive just in time to see the Colossus crush the Fortex! It smashes it to bits! Merlok goes off-line! Ava is okay, she is working on a contingency plan to get Merlok out of the Fortrex. It looks like he's done-for as the Knights retreat to the King's Castle. They finally find out what Robin is working on...turning Merlok's Tower into a ROCKET to fight the Colossus! The Colossus stomps down the walls of the city! It starts destroying things! This looks like THE END! Clay says they must launch the Rocket Tower as their last hope. But before they launch, they get a call from Ava. She's got another passenger for them...Merlok steps out of the battered Fortrex in Robin's old Mech and is now...MECHLOK! He can now directly use his powerful spells in battle! He races off for the tower and gets there just before launch! As the Colossus continues its destruction of the city, Brickland, the King and Queen and Sir Griffiths try to hold off Jestro, Ruina, and the monster horde. Finally, the Rocket Tower launches and the NEXO Knights, in Battle Suits, attack with Mechlok and battle to bring the Colossus down! They finally "de-feet". Mechlok uses a powerful magical spell - while standing in the center of the crown of the Colossus - to transform the Colossus into Glass. CLAY uses his newfound magical ability to destroy & shatter the Colossus into a mountain of Crystal. The city is saved! Ruina escapes grabbing a shard of crystal, but the monsters are wiped out...frozen back into statues without the Cloud to repower them. The Tower Rocket lands back into place. As the city rebuilds, the King again honors the NEXO Knights. The Realm has been liberated by the truest of Knights.