Prologue – The House of K
A/N: Ok so before I jump right into the story let me give new readers a bit of background on what's happening. I'm starting this story off assuming that the readers know certain details, so for all of you who have never read any of my stories before, this will hopefully be a help to you for understanding the upcoming story. I'm gonna try to make this brief but with as much detail as I believe you'll need to read this even if you haven't read the two previous installments.
Predators and Prey – First in the series. It follows the TMNT gang as they realize for the first time that they are not the only mutants in New York. On a routine patrol they come upon another mutant, Rocksteady, and begin to engage him and his fellow Foot Clan henchmen. The fight is interrupted by Asha, who is a were-lioness, who had been tracking Rocksteady with intent to interrogate and kill him. Rocksteady led an attack on a dojo in Philly that Asha's uncle owned. Her uncle was killed and several children abducted by the foot. She was trying to kill Rocksteady but was stopped by the turtles in their attempt to find out her link to the Foot, and also Rocksteady's. Both Asha and Rocksteady escape the turtles however, leaving them to wonder about the events they witnessed.
Meanwhile, Leonardo had been having clandestine meetings with Karai, who swears to him that Shredder is dead and the Foot Clan more or less disbanded. These meetings had been carrying on for a month, Leo's family completely unaware. However, the mutant Rocksteady revealed that Shredder is indeed alive and the Foot fully operational. Knowing that he had been deceived, Leo confronts Karai who then comes clean about not only Shredder having survived the fall from Sacks tower, but also that she was only lying to him to infiltrate and destroy Leo and his family. Karai also reveals Shredder's ultimate plan of mutating the population of New York in an attempt to control them and thus the city. Knowing the truth and being hurt because he now harbors real feelings for Karai, Leo threatens her life and tells her never to contact him again.
Rocksteady is tasked with delivering arms to the Foot's various hideouts, and in doing so runs into Asha once again for a rematch. The turtles are present, but have been instructed by Splinter not to engage, since Leo was not with them at the time. Asha fights and kills Rocksteady, but is grievously injured in the process and taken back to the turtle's lair to save her life. While there, she reveals her reasons for tracking and fighting the Foot clan, and also her background and information about what she is.
The Foot Clan with the help of Dr. Baxter Stockman, experiment on the children they abducted in an attempt to recover mutagen in their blood. It is discovered that the children are shifters, thus confirming the existence of were-creatures including werewolves. Once confirmed that the children have not been mutated by means of the alien substance, Karai orders them to be killed. Having understood that another possible shifter was responsible for killing Rocksteady, the murder of the children was done in order to draw out this new enemy.
Eventually, the turtles realize that the plan for mutating the populace has been accelerated and they must move quickly to prevent it. The attack happens in Manhattan, and the turtles fight desperately against Bebop, the foot soldiers, and Karai. Seeing chaos break out in the city and knowing his sons are in danger, Splinter along with an injured Asha go to fight alongside the turtles. Leo and Karai are pitted against each other in battle and Leo wins, killing Karai and taking her weapon as a souvenir.
Enter the Purple Dragons – Story picks up a few months after Predators and Prey. The turtles are taking a much needed breather after the incident in Manhattan. With Shredder alive, they have been patrolling more often. Leo and Asha have entered into a romantic relationship, although it is strained by Leo's reluctance to invest his feelings and heart. He still secretly holds feelings for Karai, even though she is dead. Asha acquires a job working at an upscale gentlemen's club which is a frequent go to for foot clan members and their business partners. Unbeknownst to the turtles, Asha is also fulfilling a personal pledge of revenge against the foot by finding and killing them whenever possible.
The turtles notice the crime rate spike as a gang called the Purple Dragons terrorize local neighborhoods. During a patrol, they gain information from one gang member about their leader Hun and his involvement with some guy named Shredder. With this new information, they begin to actively try to find out the link between the gang and the foot.
In the meantime, Shredder has legally taken over Sacks Industries, renamed it Saki Corp, and using it to gain a political and financial stranglehold on the city. A theft of many pharmaceutical drugs made headlines, and Saki Corp is suspected of involvement although they deny it. After researching the stolen drugs, Donatello realizes they are very dangerous and tells his brothers that he fears Shredder could do a lot of damage by having them in his possession. In an attempt to get more information, Asha finally reveals where she is working and that it may be a good source for more information. Leo follows her to keep her safe, but both of them are ambushed by Shredder's newest henchmen, Tiger Claw. Leo and Asha are taken to a hidden facility and tortured, while Asha is used as a guinea pig for testing the new drug.
The drug is called 'rampage', because it causes the victim to become a mindless, vicious killer. Donnie, Raph, and Mikey realize something is wrong because Leo has set his t-phone to self-destruct as a distress signal. The turtles immediately set off to find them, leading them to the secret facility and their capture. The turtle's spend a day or two there being tortured and beaten, before finally escaping.
Mourning Karai's death, the Shredder has become even more evil and cruel. He threatens police chief Sterns for control over the NYPD, and threatens the mayor also in order to gain a further foothold, and to keep authorities from interfering with his plans. His tenuous alliance with the Purple Dragons is short lived, after he orders Rahzar to force the gang members to take the drug themselves, in effect making an army to roam the streets. Hun is furious at the betrayal but is powerless to stop it, and is killed by Rahzar. Hatching his plan, the drugged gang members roam the streets creating mayhem all over the city, while the NYPD, and all other authorities are forced to stand down due to Shredder's hold over them.
The turtles are too injured to fight, and an entire day and night passes without anyone to stop the Foot clan. Eventually, they recover on the second night to end the murder and anarchy. They find themselves in a fight for their lives against Tiger Claw, Xever, and Shredder himself. Raphael is seriously injured in the fight, and Shredder is killed as a result of treachery and betrayal by his own elite guard.
The killing of Shredder throws the foot clan into upheaval as there is now a power vacuum. Shredders elite guard assume the position of power, causing a split among clan members.
The Interlude – This is a collection of one shots that take place almost immediately after the events of last story. April takes the turtles along with Asha and master Splinter on a vacation at her family's old farmhouse. These short stories center primarily on Leo and Asha's relationship, along with a few surprises including Karai's apparent resurrection from the dead, and how the top members of the Foot Clan are handling their new masters.
I highly suggest you read The Interlude if nothing else, since it's main function is to bridge Enter the Purple Dragons with this story The House of K.