Invasion of the Netherworld

The **Invasion of the Netherworld** (also known as the **Resurretion of Shredder**, the **Netherworld Invasion**, and the **Conquest of Kavaxas**) was a big epic battle from *Teenage Mutant Ninja Turtles*. It deals with the Turtles and some of their allies fighting to stop a Demodragon named Kavaxas and ghosts from the Netherworld who are invading New York. The battle takes place in the Season 5 episodes, "Scroll of the Demodragon," "The Forgotten Swordsman," "Heart of Evil," and "End Times."

## History

### Background

It all started with a race of powerful creatures called the Demodragons which were monsters that were part demon and part dragon. They lived in the dimension of the afterlife known as the Netherworld which people usually tired to summon for millennia but their efforts always ended in tragedy. The Netherworld and the Demondragons were also ruled by the most powerful Demodragon, Kavaxas who had the power to grant wishes and bring people back from the dead but in order for people to control him they used a special ancient mystic seal which had the power to make Kavaxas do the bidding of whoever held it. It also started after the Super Shredder Attacks, when Splinter last fight with Super Shredder caused some of Super Shredder's special Mutagen to leak out of his body which wound up in the sewers. The special Mutagen was then found by a homeless man who touched and mutated into a Shredder mutant with only random thoughts and memories of the Shredder. After that, he started capturing people from the streets and used the special Mutagen to mutate them into more Shredder mutants until they became an army known as the Foot Cultists who hid themselves by wearing robes. Eventually, they built an underground shrine to Shredder in the sewers, were discovered months later by the remaining members of the Foot Clan while hunting for the Turtles, and Shredder's second-in-command, Tiger Claw became their leader. Tiger Claw then came up with a plan with the Foot Cultists to resurrect Shredder after he was killed by Leonardo, but in order to do that they needed the Scroll of the Demodragon which could summon Kavaxas from the Netherworld so they can have him resurrect Shredder. But one night, Raphael and Casey found one of the Foot Cultists while they were returning back to the lair after patrolling New York City where they saw it trying to mutate someone using the special Mutagen. They chased it through the sewers until they found the other Foot Cultists who attacked them. They tried to fight them off but they were outnumbered by them so escaped from them and managed to barley make it back to the lair where they told the other Turtles and April what had happened. So the Turtles, April, and Casey all started searching the sewers from the Foot Cultists using special devices that Donatello made to detect them but during that time, Tiger Claw ordered the Foot Cultists to find the Scroll of the Demondragon. Leonardo was was able to find three of them using the devices and followed them through the sewers and up to the surface with Michelangelo where they saw the Foot Cultists steal the Scroll of the Demondragon from a strange library of a wealthy collector of magical artifacts. They tried to fight them off but the Foot Cultists were too strong and managed to escape with the scroll. Leonardo and Michelangelo then went back to the lair where they told the others about the scroll which Donatello does some research on and found out about Kavaxas and the Demondragons. The Turtles, April, and Casey were able to find the Shredder Shrine in the sewers using Donatello's detection devices where they saw Tiger Claw prepare to use the Scroll of the Demodragon to summon Kavaxas and control him using the Seal of the Ancients which he somehow found. The Turtles, April, and Casey planned to get the scroll but they were all captured by the Foot Cultists who snuck up behind them. After they were presented to Tiger Claw, who used both the scroll to summon Kavasxas from the Netherworld and take control him using the seal.

### The Battle

Tiger Claw then orders Kavaxas to attack the Turtles, April, and Casey which they try to fight off but Kavaxas is too powerful for them. He also starts attacking out of line but Tiger Claw is able to get him to hold back because of the seal. Leonardo tries to attack Kavaxas with his kanata swords but they just shattered when he did. Then when April protects Raphael, Donatello, and Casey from Kavaxas' fire breathe using her psychic powers, it makes Kavaxas interested in April by eating her and gaining her powers but she is saved by the Turtles and Casey who all manage to escape. Kavaxas tries to go after them but is stopped by Tiger Claw using the seal. Sometime later, Tiger Claw has Fish Face get Rahzar's corpse out from under the ocean and brings it to the Shredder Shrine where Tiger Claw has Kavaxas use his powers to revive Rahzar which Tiger Claw uses as a test to show Kavaxas' power to raise the dead so he can bring back Shredder. However, Kavaxas tell Tiger Claw that he doesn't have all he needs to bring him back. In order for Kavaxas to bring back Shredder, he needs both Shredder's heart and helmet the Kuro Kabuto so Tiger Claw sends out Rahzar and Fish Face to find the helmet and bring it back. Meanwhile at the Turtles' lair, Donatello's detection devices picked up Rahzar and Fish Face heading for Shredder's old lair so Leonardo sends Raphael and Michelangelo to track them. However, Raphael and Michelangelo find out Rahzar and Fish Face looking for Shredder's helmet which wasn't at his old lair so Raphael and Michelangelo follow them as they search for it to find out why they want it. But are then soon attacked by them, and reveal to Raphael and Michelangelo about their plan to have Kavaxas bring back Shredder who later escape. Meanwhile, Karai and Shinigami deal with their Foot Soldiers who have betrayed them and sided with Karai's old teacher, Hattori Tatsu the Blind Swordsman who has declared himself the new leader of the Foot Clan and has taken Shredder's helmet which is the key to controlling the Foot Clan. After Tatsu defeat Karai and Shinigami, they retreat to the Turtles' lair for help just as Raphael and Michelangelo return and tell everyone about Tiger Claw and Kavaxas' plan to bring back Shredder. Soon Rahzar and Fish Face confront Tatsu for the Shredder's helmet but Tatsu offers Rahzar a place with him if he lets him have the helmet and become the new leader of the Foot Clan. Later, the Turtles, April, Casey, Karai, and Shinigami arrive at Tatsu's lair at Foot Clan safehouse in the Party Wagon where Leonardo, Michelangelo, Karai, and Shinigami go to deal with Tatsu and get back the helmet while Raphael, Donatello, April, and Casey stay to lookout for Rahzar and Fish Face. Michelangelo and Shinigami take out the Foot Soldiers outside and shutdown the power while Leonardo and Karai take out the Foot Soldiers inside then they all fight off Tatsu with Leonardo using Master Splinter's special swords. However, the Foot Soldiers surrounded the Party Wagon and ambush Raphael, Donatello, April, and Casey which they fight off. Eventually, they beat them and help the other fight Tatsu but he mostly beats them and injures both Casey and Shinigami until Leonardo and Karai defeat Tatsu. Karai then declares the Foot Clan's leader and earns back the Foot Soldiers but soon Rahzar arrives and brings both Tiger Claw and Kavaxas. Kavaxas then kills Tatsu by sucking out his soul and takes the helmet while Tiger Claw orders him to destroy the safehouse and everyone in it. April is able to save everyone using her psychic powers then they take Casey and Shinigami to the hospital patch up their own injures and ask Karai to help them stop Tiger Claw and Kavaxas from bringing back Shredder which she accepts. Meanwhile, Kavaxas returns the helmet to Shredder's corpse and Tiger Claw makes plans to search for Shredder's heart.

However, the heart is found by the Italian mob boss, Don Vizioso who plans on eating it so he can gain the power of Shredder. Meanwhile, Tiger Claw sends out Bebop and Rocksteady to find the heart so they can bring back Shredder tonight unaware that the Turtles, April, and Karai had splint up into three teams to spy on them so they can stop them. With Raphael and Michelangelo spying on Tiger Claw and the Foot Cultists, Leonardo and Donatello spying on Rocksteady, and April and Karai spying on Bebop. Eventually all teams find out about Tiger Claw, Bebop, and Rocksteady searching for the heart but Bebop takes out both April and Karai. Meanwhile, Rocksteady reports to Tiger Claw that he has found out about Don Vizioso finding the heart so he and Bebop are going to try and steal it from him. With Bebop planning to try and steal it using his invisibility suit and if it doesn't work then Rocksteady will arrive and they will both try to steal the heart from Don Vizioso by force. But Leonardo and Donatello are able to find them and Donatello decides to go rush in and steal the heart so he can get revenge of Don Vizioso for trying to dissect him with Leonardo following him. Bebop tries to steal the heart by sneaking into Don Vizioso's restaurant and taking it but Vizioso keeps moving the heart to the point where it exposes Bebop. So Rocksteady comes into the restaurant and attacks the place then Leonardo and Donatello come in. Everyone fights each other to get the heart but Don Vizioso is able to escape with it, then Leonardo, Donatello, Bebop, and Rocksteady all flee the place when it gets filled with anti-mutant gas. At first, Kavaxas is angry about Bebop and Rocksteady losing the heart until they reveal to him and Tiger Claw that Don Vizioso is hiding out at his hotel and is planning to flee from the city so Tiger Claw prepares for them all to attack Don Vizioso's hotel and get the heart. Back at the lair, Donatello is upset that he and Leonardo lost the heart but Leonardo tells Donatello that is was his fault which leads to an argument until Karai calms them both down. Then the Turtles, April, and Karai plan to get heart back at Don Vizioso's hotel where Leonardo plans to go into the hotel alone to get the heart while everyone else tries to get the Seal of the Ancients from Tiger Claw if he shows up with Kavaxas but Donatello goes off on his own to get both the heart and Don Vizioso. Suddenly, Bebop and Rocksteady arrive and fight off Don Vizioso's henchmen along with Kavaxas and Tiger Claw. So Leonardo goes after Donatello while everyone else tries to get the seal from Tiger Claw. But then Hammer shows up with his mutant fighting mech suit and fights off Kavaxas but Kavaxas beats Hammer, tears apart his mech suit, and kills him by sucking out his soul. But then Raphael, Michelangelo, April, and Karai fight off both Tiger Claw and Kavaxas to get the Seal of the Ancients. While Leonardo and Donatello fight off Bebop and Rocksteady, beat them, and go after the heart. Eventually, Tiger Claws gets the seal and Michelangelo gets hurt while Leonardo and Donatello are able to defeat Don Vizioso and the Fulci Twins and get the heart while Donatello is able to let go of his thirst for revenge but then Tiger Claw and Kavaxas attack Leonardo and Donatello, get the heart, and escape. Afterwards, Don Vizioso and the Fulci Twins are arrested while everyone takes Michelangelo back to the lair to heal up. But Kavaxas returns the heart to Shredder's corpse and is able to resurrect Shredder as a zombie thus becoming Zombie Shredder.

After that, Tiger Claw orders Kavaxas to fully heal Shredder so he can send Kavaxas back to the Netherworld but Shredder wants Kavaxas to stay. Back at the lair, the Turtles, April, and Casey prepare to fight off against Kavaxas, Tiger Claw, the Foot Cultists, and Zombie Shredder with Donatello planning to get enough data on Kavaxas to find out how to beat him. But when they get to the entrance of the Shredder Shrine, they run into the Foot Cultists who are about to attack them until Fish Face arrives and scares off the Foot Cultists using a lamp. Fish Face reveals to the Turtles, April, and Casey about the Foot Cultists and that he is leaving the place because of Zombie Shredder. When the Turtles, April, and Casey get the Shredder Shrine, they are all corned by Kavaxas, Bebop, Rocksteady, Rahzar, and the Foot Cultists then Zombie Shredder arrives and attacks them with his new zombie powers. Everyone fights him off but because of Zombie Shredder's powers he is now unbeatable then Michelangelo is able to get the Seal of the Ancients from Tiger Claw which gives him control over Kavaxas. He orders Kavaxas to attack Zombie Shredder and the Foot Clan but Bebop is able to get the seal and gives it back to Tiger Claw. However, Donatello is able to get enough readings on Kavaxas so the Turtles, April, and Casey escape then Zombie Shredder makes Kavaxas his new second-in-command much to Tiger Claw's shock and confusion. Back at the lair, Donatello uses the data he's collected on Kavaxas to create new weapons designed to take down supernatural entities called Spectro Blasters which the Turtles, April, and Casey prepare to use on Kavaxas and Zombie Shredder. Then Karai arrives on Leatherhead which Michelangelo called to help stop Kavaxas and Zombie Shredder. Back at the Shredder Shrine, Tiger Claw questions weather or not Zombie Shredder is alive or a slave of Kavaxas which Bebop agrees on. Suddenly, Zombie Shredder order Tiger Claw to give the Seal of the Ancients to Kavaxas but Tiger Claw refuses because it is too dangerous so Zombie Shredder has Rahzar attack Tiger Claw then he breaks the seal into three parts just by stepping on it. Then Kavaxas reveals that everything he has done with the Foot Clan has all been part of his own plan to destroy the world which he could only do by performing three deeds. Which were destroying a great warrior which was Tatsu, resurrecting an evil warrior which was Shredder, and destroying the Seal of the Ancients which could control him. With all the three deeds done, Kavaxas unleashes the spirits of the Netherworld onto the Earth to conquer it so he can rule both it and the Netherworld with Shredder and Rahzar serving him. On the surface, the sky gets covered with green storm clouds with lightning then the grounds cracks open and out from the comes the ghostly spirits of the Netherworld that attack and terrorize the city. When the Turtles, April, Casey, Karai, and Leatherhead notice the spirits of Tatsu and Ho Chan arrive and attack them. So Leonardo, Michelangelo, Karai, and Leatherhead go to stop Kavaxas while Raphael, Donatello, April, and Casey fight off the ghosts. Back in the Shredder Shrine, Tiger Claw fights off Rahzar while Bebop and Rocksteady run away then Leonardo arrives and attacks Kavaxas with his Spectro Blaster but Zombie Shredder knocks him away. As the cracks to the Netherworld get bigger, Tiger Claw knocks Rahzar into it and helps Leonardo, Michelangelo, Karai and Leatherhead fight off both Kavaxas and Zombie Shredder. Back on the surface, Raphael, Donatello, April, and Casey fight off the ghosts with their Spectro Blasters but more just keep coming. Then when Ho Chan grabs Casey, the spirit of Master Splinter arrives and fights off Ho Chan while Raphael, Donatello, and April defeat Tatsu. In the Shredder Shrine, Karai knocks Zombie Shredder into the Netherworld while Michelangelo finds the pieces of the Seal of the Ancients and uses some gum to fix it. With the seal, Michelangelo orders Kavaxas to change everything back to normal which he does. This causes of the ghost to return back to the Netherworld and all the cracks to seal up. Leonardo then has Michelangelo have Kavaxas open a portal back to the Netherworld which causes Kavaxas to be sucked into it along with Zombie Shredder who returns and attacks Kavaxas for controlling him

### Aftermath

Later in the morning, the Turtles, April, Casey, Karai, and Leatherhead say their official goodbyes to the spirit of Master Splinter who says his goodbyes too and passes on to the afterlife then everyone enjoys the sunrise of a new day. After that, they destroy the Seal of the Ancients into dust and spread it over the ocean so no one can ever use it again. Tiger Claw also leaves the city after declaring a truce which officially ends the threat of the Foot Clan for good but the whereabouts of the Foot Cultists remains unknown.

## Belligerents

### Turtles

* Leonardo
* Raphael
* Donatello
* Michelangelo
* April
* Casey
* Karai
* Shinigami
* Leatherhead
* Tiger Claw
* Master Splinter

### Netherworld

* Kavaxas
* Zombie Shredder/Shredder
* Rahzar
* Tatsu
* Ho Chan
* Spirits of the Netherworld

### Other

* Foot Clan
	+ Fish Face
	+ Bebop
	+ Rocksteady
	+ Foot Cultists
* Foot Soldiers
* Don Vizioso's Gang
	+ Don Vizioso
	+ Hammer
	+ Fulci Twins
	+ Don Vizioso's Men

## Navigation

*Disney*: Operation W.A.R. • Robot Riot • Kree-Skrull War • Graviton's Attack • Gamma World • Kang's Invasion • War for the Cosmic Cube • Loki's War • Skrull Invasion • Assault on 42 • Invasion of Galactus • Asgardian-Symbiote Attack • Skirmish on the Tri-Carrier • Battle of the Web Warriors • Attack of the Synthezoids • Contest of Champions • Attack on the Triskelion • War of Carnage • Doctor Octopus' Last Attack • Mystery Shack Zombie Attack • Weirdmageddon Rebellion • Attack of Cosmic Skull • War of the Squadron Supreme • Invasion of Thanos • Ultron Revolution • Frozen Invasion • Secret Wars • Kree Invasion • Battle of Sarrish • Battle of Christophsis • Malevolence Campaign • Battle of Quell • Defense of Maridun • Battle of Orto Plutonia • Liberation of Ryloth • Skirmish on Felucia • Attack of the Zillo Beast • Second Battle of Geonosis • Battle of Saleucami • Skirmish aboard the Coronet • Attack on Kamino • Battle on Wasskah • Civil War of Mon Cala • Skirmish on Naboo • Battle of Umbara • Attack on Dathomir • Liberation of Onderon • Invasion of Scipio • Battle of Anaxes • Siege of Mandalore • Siege of Lasan • Attack on Phoenix Squadron • Assault on Seelos • Assault on Garel • Battle of Atollon • Liberation of Lothal • Asgard War • Symbiote War • Attack of Magus • Conquest of Serpent • Saporian War • Battle of Old Corona • Battle of Corona • Goblin War • Symbiote Invasion • Robot Revolution • Wakanda-Atlantis War • Battle of Jakku • Battle of Castilon • Battle of the Barabesh System • Toad Tower Heron Attack • Hunter vs. Alastair Feud • Newtopian Barbari-Ant Invasion • Toad Rebellion • Amphibia Revolution
*Nickelodeon*: Attack on the Shredder • Triceraton-Federation War • Attack on TCRI • Battle of the Battle Nexus • Triceraton Invasion of 2003 • Final Shredder Battle • Battle of the Five Dragons • Kraang-Triceraton War • Rat Wars • First Kraang Invasion • Second Kraang Invasion • Battle for New York • Triceraton Invasion of 2012 • War for Dimension X • Super Shredder Attacks • **Invasion of the Netherworld** • Invasion of Dregg • Monster Invasion • Carmageddon
*Movies*: Battle for Pride Rock • Lion War • War of the Brotherhood • Fight of the Stone Generals • Battle of the Red Death • Ogre Revolution • Battle of Gongmen City • War of the Brothers • Battle of Bricksburg • War of the Dragons • Battle of Panda Village • Battle of Gotham City • Garmadon's War • Battle of Ninjago • Brother-Sister War • Dragon Hunter Battle • Northuldra War • The Mitchells vs. The Machines Battle