Disclaimer: I do not own Harry Potter or Teenage Mutant Ninja Turtles.
It is said there is no greater pain than the loss of one's child. Master Splinter and now Shredder too would attest to that. As he sat upon his throne, the leader of the Foot Clan found himself remembering the years he had spent raising Karai as his daughter. Despite being a relationship founded on lies, Oroku Saki truly loved the girl as his own. Not even her discovery of the truth of her origins had changed that for him. So as his mind turned to the last memory he had of Karai: the sight of her cage dropping into the mutagen.
"Master Shredder, the hour grows late" said Tiger Claw, kneeling before the throne, drawing his master from his thoughts.
"They are dangerous allies" Shredder acknowledged. "But they have provided us with much technology – asking little in return."
"They will betray you. You know this. They care nothing for the human race."
"Nor do I. Leave me Tiger Claw."
Once Tiger Claw left, Shredder activated the communication device inside the very same Kraang droid, Karai had salvaged for the Foot the previous year.
"Kraang Prime" the ninja master greeted, once the Kraang leader's projection appeared.
Kraang Prime: "One called Shredder. Kraang must have your decision."
"If I help you, will you keep up your end of the bargain?"
Kraang Prime: "Kraang will deliver the ones called: Splinter, Harry, and the Turtles."
"And when I find Karai, you will mutate her back too normal?" Shredder demanded.
Kraang Prime: "Kraang agrees to this. But in return Shredder must help Kraang conquer the city known as New York City and then the world!"
Winter had finally decided to make itself known in New York, dropping snow all over the city. But as she walked the streets with Irma, April found that not even the biting cold could draw her mind away from a certain, currently missing friend.
Harry, where are you? April wondered.
The Kraang Invasion could happen any day now and to make matters worse, the Hogwarts group had told them the extended break was over and the castle was open to students again. With the second term starting the following day and with Dumbledore's looming threat, it was more crucial than ever for them to locate Harry.
"Hey April are you listening?" asked Irma, noticing her friend's silence.
"Sorry Irma" April apologized. "What did you say?"
"I was asking; why can't you just introduce me to these secret friends of yours?"
"One of these days Irma" the redhead assured her. Though April herself wasn't so sure when or even if such a day would come. "They're really good, um people. Anyway I want to know, how can you go out in this weather without a coat?"
"I hardly ever notice the cold" said the purple haired girl. "But seriously, if we're friends; we should introduce friends to friends."
Irma's needling came to an abrupt end as suddenly a swarm of Foot bots surrounded the girls.
"These aren't the kind of friends I meant" Irma said fearfully.
"Move Irma" April urged her friend. "Run!"
The girls took off running with the seemingly endless horde of Foot bots following after them. With the Foot bots closing in April tried to call for help but before she could, her T-phone was taken out by a Foot bot's shuriken.
"Just great" April cursed. "Irma, this way!"
Grabbing her friend, April pulled Irma down an alleyway. Problem was it was a dead end and the Foot bots were closing in on them. But if there was one thing April's learned, it was there was always a way.
When the Kraang bots caught up to them the robots couldn't find any trace of Irma or April. Scanning the alley, they immediately focused on the obvious hiding place: a public dumpster. But while the Foot bots got to work stabbing the inside of the dumpster with their swords, the robots failed to notice April and Irma sneaking away from behind a smaller pair of trashcans.
"So what now?" Irma questioned.
There's only one option April told herself. "This way."
Despite the feelings of guilt growing inside her at what she was about to do, April directed Irma to a nearby manhole.
"You're not serious?" Irma whined. But April wasn't in the mood as this was hard enough for her. So Irma had no choice but to follow her into the sewers, lest the Foot bots find them.
Unaware of the danger April was facing, Raph was busy staking out on a rooftop, scanning the area for any signs of his wayward brother.
Come on, where are you Harry? Raph wondered, silently urging his younger brother to reveal himself. "You got anything, Casey?" he asked but all he heard was the sound of a camera going off.
Feeling curious, Raph looked down at the alley bellow and to his frustration found Casey taking pictures of some wall art.
"Casey, we're supposed to be looking for Harry?!" the turtle snapped. "What the hell you doing?"
"Relax, Raph" said Casey. "I want to find Harry too. I'm just taking a minute to checking some awesome art. Come on, man; it's so metal."
The 'awesome, meta' art in question was a spray painting of a girl that looked a lot like April leaning up against an overly stylized version of Casey in his vigilante gear. Raph really wasn't in the mood for this.
"Hey, Raph I've got a question for you" said Casey. "So um, does April ever talk about me?"
Yep, really not in the mood for this Raph cursed. "It doesn't matter Casey. You know how Donnie feels about her."
"Yeah-yeah, it's cool" the vigilante chuckled nervously, not wanting to start something. "When you've got that man-woman thing on a team it just screws everything up. I'm not that into her anyway."
Of course Raph wasn't convinced, considering the art on the wall that he was fairly certain Casey had painted himself. For now, he was just happy to get back to searching for Harry.
Speaking of Donatello; the purple turtle was having a hard time of things as he worked to complete their greatest weapon against the approaching Kraang Invasion and he was feeling the stress.
"Ugh, I'm so worried I can't even eat" said Donnie, tossing away his slice of pizza.
"Me too" Mikey agreed, catching Donnie's pizza slice before stuffing it along with his mouth.
"You have a right to be concerned" said Splinter, entering the lab. "The Kraang Invasion is imminent. What plans have you devised to stop it?"
"I give you my latest invention" Donnie announced, capturing Splinter, Leo, and Mikey's attention, as he displayed the schematics for his invention. "The Turtle Mech! It's fully armed with rockets, flamethrowers, and an electro harpoon. It's guaranteed to stop a massive Kraang invasion army, or your money back."
"Giant robots are awesome!" Mikey cheered. "I vote Turtle Mech!"
"But that thing isn't even ready" Leo argued. "It could damage New York more than help it"
"It's ready" Donnie huffed. "You know…enough."
"We need to establish a second base, outside the city."
"There's no time for that, Leo. The Turtle Mech is solid. If I were leader…"
"But you're not leader, Donnie – I am!"
"Enough!" Splinter bellowed. "Your egos fight one another, when we should be preparing to fight The Kraang."
As luck would have it – not long after returning to his rooftop perch, Raph spotted something slithering across a nearby rooftop.
"Casey, I see Harry" Raph gasped. "He's slithering across the street."
But before they could go and collect their prize they'd have to deal with the police who had picked the worst time to drive up.
"Can I help you officers?" Casey asked, as two officers exited their car. We so don't have time for this.
Officer 1: "You're loitering kid."
"Loitering, seriously?" the teenage vigilante scoffed. "Don't you have real criminals to bust? Maybe a doughnut shop to go to?"
Officer 2: "We'll figure out a charge later, Casey Jones."
"How do you know my name?" Casey demanded, but the officers refused to answer. Instead they grabbed hold of Casey and started pulling him towards their squad car. "Hey, let me go. I've got rights!"
Back down in the lair, Donnie and Leo weren't done arguing something that certainly got Hedwig and Karai's attention as the turtles and Splinter moved into the living room.
"Ok seriously, what are you two fighting about?" asked Karai.
"Leo, doesn't understand that the Turtle Mech is our best chance to stop The Kraang" said Donnie. "He just can't be reasonable."
"I am being reasonable" said Leo. "That's why we need a second base."
Karai was about to offer her two cents when all conversation came to an end as April and more importantly Irma ran into the lair.
"Guys, I'm sorry about this" April gasped.
"April, you have brought a stranger here" said a bewildered Splinter.
"Please, tell us there's a good reason" Hedwig added.
"There is" April assured them. "Foot bots were after us. But-but Irma here is really good at keeping secrets."
April's case wasn't helped by Irma standing frozen at her side, staring at the mutants with an unreadable expression on her face.
"Um, ok look I know they look…different" said Karai, trying to keep her temper under control, despite her growing irritation at April for bringing Irma to the lair. "But they won't hurt you."
"Yes, why don't you come inside and I'll make you some tea" Hedwig offered.
"T-Turtles" Irma suddenly stuttered, her voice slowly taking a more robotic tone. Then to their shock and horror, the girl's neck suddenly extended and her head started swiveling. "Turtles. Turtles. Turtles."
Suddenly it hit them as they (except Karai) remembered Harry once telling them about Kraang Subprime and his Lockhart droid. As Irma's body went through the same transformation it was clear just who they were facing.
"Kraang Subprime, is back baby!" the alien grinned toothily.
"April, you've got to pick your friends more carefully" said Mikey.
"Irma was a…" April gasped.
"Kraang" Subprime finished for her, taking the moment to throw the lair's arcade video game machine at them, forcing April and the Turtles to duck while Splinter and Hedwig leaped over the machine. "Lowly insects, kneel before the genius of Kraang Subprime. The discovery of the lair was the last component needed to launch full scale invasion!"
Having locked on to the Irma bot's signal, The Kraang opened portals directly to the lair allowing their forces to invade their home.
The lair wasn't the only place with portals as while Raph tried to devise a way to help Casey, he suddenly spotted several portals opening up around the city and the Kraang forces marching through them.
Raph wasn't sure what to do as he as he knew he needed to warn his family and fight the aliens. But at the same time he couldn't just abandon Casey.
As it turns out he wouldn't have to choose as Casey in his struggling against the police, accidently slaps one across the face with his hockey stick. The impact though not doing any real damage did have the benefit of shorting out the officer's image revealing himself as a Kraang droid in disguise.
"Raph, it's The Kraang!" Casey yelled. "They've already infiltrating. They're here!"
With things made clear, Raph dropped down from his perch, digging his sai into a Kraang droid, while Casey managed to defeat the other.
"Raph, what's going on?" Casey asked, desperately looking for answers.
"It's the invasion" Raph realized. "It's started"
At that moment another portal opened in front of them delivering another squad of Kraang droids. The aliens immediately opened fire forcing Raph and Casey to retreat. With the city falling into chaos as the Kraang began their invasion, Raph and Casey realized their only course of action was to try and make their way to the lair for backup.
Of course Raph and Casey didn't know that the lair was no safer than being up on the surface as the soldiers under Kraang Subprime's command laid waste to their home, and keeping them pinned down behind pipes and whatever else they could find for cover.
"This is so messed up" April complained. "I've been hanging out with a Kraang!"
"Yeah it really is" Karai agreed. Jumping out from behind cover the kunoichi, threw a spray of shuriken taking out three Kraang blasters, before being forced to dive behind the overturned pinball machine for cover as more alien forces invaded.
Seeing Karai in trouble, Leo moved to help her. Coming out from behind a support column, Leo started slicing through as many Kraang as he could.
Mikey was forced into the kitchen by the Kraang, taking cover behind the table. Deciding to make a stand the fun loving turtle, grabbed the pots off the stove and threw them at the Kraang droids, hitting two of them in the head.
When a third Kraang droid moved in, Mikey kicked it into the counter. But the Kraang droid wasn't down yet and quickly recovered. The alien stalked towards the turtle when suddenly the freezer door swung open bashing into the Kraang droid's head, taking it out.
"Oh yeah" Mikey cheered, giving a grateful high-five to Ice Cream Kitty for the save. But the turtle celebrated too soon as a savage kick to the shell, from Kraang Subprime's Irma bot knocked him to the ground.
Picking Mickey off the ground, Kraang Subprime released a buzz saw from the Irma bot's hand and was moments away from slicing into the turtle. Luckily Mikey has a very protective mother figure as Hedwig arrived on the scene, firing her feather blades at the Irma bot, stabbing it in the base of the neck, causing a minor short and cutting of the Irma head.
"Thanks" Mikey gasped, using the brief opening to escape Kraang Subprime's grip.
Hedwig didn't get the chance to respond when suddenly the disembodied Irma head sprouted mechanical spider legs, and started firing lasers from its eyes, catching the owl mutant by surprise as one such blast grazed one of her wings.
Worried for Hedwig's safety, Mickey knocked the Irma head away with his nunchucks and helped her fall back to the living room with Kraang Subprime following closely behind.
"Destroy the Turtles!" Kraang Subprime commanded. "Wipe out the lair! But Karai and the Rat comes with us."
"Oh and what do a bunch of alien freaks want with us?!" Karai demanded, as she charged at Subprime. Blade at the ready the kunoichi moved to strike at the alien but the Irma bot was faster than she expected, and Kraang Subprime soon had her trapped in his robotic grip.
"Won't daddy be surprised to see you" the alien grinned. Karai's eyes widened in horror as she remembered April mentioning Foot bots attacking her in the street.
Shredder has no idea, I'm alright. He helped The Kraang to get to me! No words could express her guilt as Karai realized her failed attempt at vengeance against the Shredder not only ended in Harry's mutation, it also helped The Kraang gain the alliance needed to locate the lair and start their invasion.
"Miwa!" Splinter roared, knocking the Irma bot aside with a flying kick.
Thrown off balance, Kraang Subprime lost his hold on Karai dropping her as Splinter landed a double-palm strike knocking the Irma bot into the dojo.
"All of you, go!" Splinter ordered. "Escape, I will hold them off!"
"We're not leaving you!" Leo argued.
"I have a plan" he assured them, just as Kraang Subprime came bursting out of the dojo, charging at Splinter with buzz saws extended from both arms.
While Splinter and Subprime became locked in battle, Donnie ordered everyone to head for the Shell Raiser.
"You'll go nowhere" said Subprime, knocking Splinter back with a solid kick to the chest. Extending a missile launcher from the Irma bot's left arm, Subprime prepared to blow them all to smithereens.
Seeing the danger, Hedwig broke off from the others, launching her feather blades at Subprime just as the alien fired. With his aim thrown off, the alien's missile flew past Karai, April, and the Turtles – instead landing a direct hit on the Shell Raiser doing major damage to the vehicle as the blast toppled it over.
"My baby!" Donnie cried.
"Take the tunnels!" Hedwig ordered, launching herself back into the fight. "I'll stay with Splinter."
With no other choice, but to escape Karai, April, and the Turtles head for the sewer tunnels trusting Hedwig and Splinter to make it out alive.
"This is all my fault" said April. "I lead them to the lair."
"Don't blame yourself, April" said Mikey. "You were just trying to help a friend."
Yeah if you want to blame anyone, blame me. Karai thought to herself. I'm the reason, Shredder's joined up with The Kraang.
As bad as things were, they were about to get worse as the group found themselves at a fork in the road.
"Which way?" asked April
"Left" said Donnie, pointing to his chosen tunnel. "That'll lead us straight to the Turtle Mech."
"No, we need to find Raph and Casey first" said Leo.
"We can find them in the Mech" the purple turtle insisted.
"It's too slow" the blue turtle argued.
"You're the one that's too slow. You're leading us into disaster!"
"I'm doing what Splinter would want us to do!"
"Well, I'm guessing he wouldn't want us standing here watching the two of you fight!" Karai interjected, moving to stand between the arguing brothers. "We need to get moving before more Kraang find us."
But it was too late as suddenly a portal opened up in front of them, releasing a large force of the alien invaders. The Kraang wasted no time opening fire, catching Donnie off guard as the one of their laser blasts, broke through his defenses, damaging his arm and taking him out of the fight.
Trusting April to watch over Donnie, Mikey charged at the Kraang taking out three of them with a few quick powerful blows to the head with his nunchucks. But it didn't make much difference as more Kraang continued to pour into the tunnel.
Leo and Karai took up position by the portal doing their best to bottle neck the alien's entry point, with their blades slicing into any Kraang droid to pass through. But as more Kraang started to arrive from the other side, it was clear that if something wasn't done soon, it'd be all over for them.
"Guys, take Donnie and April to safety" said Leo. "I'll lead them away."
"Dude, we can't leave you too" Mikey argued, as he fought bravely to keep the incoming Kraang away from April and Donnie.
"Don't worry, I'll stay with him" said Karai, giving Leo a look that dared him to try and argue with her. "Hey, Kraang! I hear Shredder's looking for me!"
With the Kraang droids momentarily distracted by the appearance of a clearly non-mutated Karai, Leo used the opening to drop as many smoke bombs as he could, covering April, Mikey, and Donnie's escape. With the others safe Karai and Leo tore through a number of Kraang before taking off running down the opposite tunnel, using the aliens' desire to deliver Karai to Shredder to keep their attention on them.
With the streets proving to be a lost cause, Raph and Casey had taken to the rooftops doing their best to stay hidden as they moved across the city. A feat that was proving to grow more and more difficult as now even Kraang ships had begun to fill the sky.
"Dude this is worse than that giant Technodrome thing from last year" said Casey. "This is totally crazy."
Raph found he had to agree, as bad as it was at least the Technodrome was one ship. A full on invasion was proving to be much worse. Worried about his family, it came as a great relief to the turtle when his T-phone started to ring.
"Mikey, where are you?" he demanded immediately.
"On our way to April's apartment. Meet us there, dude."
"Roger that."
"Raph, look out!" Casey suddenly cried out.
Their cover had been blown as a Kraang ship suddenly barreled down on them, forcing Casey and Raph to take off running for their lives, as it fired down on them.
Despite the hell consuming the city, April, Donnie, and Mikey had managed to make their way to her apartment, where she immediately started work on treating the purple clad turtle's arm. Meanwhile her father was trying and failing to keep his cool-
"The city's overrun" Mr. O'Neil said fearfully. "What're we – what is anyone going to do?"
-and he was failing. Speaking of failing Donnie had the bright idea to choose this moment to have a heart to heart with his not so secret crush.
"April, now that it's the end of the world…again" Donnie said nervously. "I figured…I better just kind of tell you, how I feel."
Not in the mood to have that awkward conversation, April gave the bandage around Donnie's arm an extra tight pull, shutting the turtle up as the pressure aggravated his wound.
"Sorry, Donnie" said April. "You should stop talking it just makes things hurt more."
Suddenly the building shook as something large passed by the building. The very loose hold Mr. O'Neil had kept over his fears gave way, resulting in April, Donnie, and Mikey being witness to the awkward scene of Kirby O'Neil falling to his knees and breaking out into tears.
"We're doomed! Doomed" he cried. "My poor sweet April!"
"Don't worry, Mr. O'Neil" said Mikey. "This whole alien invasion thing is really no big deal."
Hoping to prove his point, Mikey pulled open the blinds to let in the picturesque view of the city slowly being torn apart by The Kraang.
"Oh, never mind" the orange turtle grinned, shutting the blinds. But the damage had been done as it all proved too much for Kirby causing him faint and fall to the floor face first.
Back down in the lair, Hedwig and Splinter continued to battle against Kraang Subprime's Irma bot. The two mutants were losing ground as the alien machine proved to be formidable, and their home fell apart around them.
Kraang Subprime had just managed to knock Splinter into Donatello's lab, when the owl mutant came up from behind, using her metal tipped feathers like swords, Hedwig cut into the Irma bot's back, exposing wires. But before she could tear further into the machine, Subprime swiveled the Irma bot's torso, catching Hedwig by surprise as its fist swung around knocking her across the room.
"Now, I've got you cornered" Subprime taunted, turning his focus back to Splinter. "You, monstrous rat."
"Corner a rat, and see what happens" Splinter countered.
Enraged by Splinter's taunt, Subprime charged at the ninja master, with the Irma bot's buzz saws. Careful to avoid the blades, Splinter deflected the Irma bot's arms away, as he carefully moved the alien further into his trap. Knocking the Irma bot off balance with a palm strike to the chest area, Splinter used the opportunity to flip himself over the machine's head, using his feet to kick the bot forward as he passed overhead.
Angered by his inability to kill the ninja master, Kraang Subprime whipped around intending to pursue his target. But to the alien's horror instead of Splinter he was met with the sight of a very large, and very heavy support column falling towards him.
"Aw, Kraang" Subprime cursed, just before he crushed under the pillar.
With Subprime defeated, Splinter turned to Hedwig, bowing his head in gratitude, for his friend's assistance in cutting the support column in time to finish their enemy.
Together they moved out to the living room, sorrowfully taking in the destruction done to their home. Everything was in shatters, and flames were scattered across the remnants of the lair. Scanning the ruble, Splinter quickly zeroed in on a framed photo lying on the ground.
Moving to Splinter's side, Hedwig saw that it was a photo of Harry and the Turtles all together, happy and smiling.
"Splinter" Hedwig said gently.
"Yes, we must find our family" said Splinter.
Having defeated the Kraang droids pursuing them, Karai and Leo took to the surface. At first glance it seemed they had managed to come out in an area of the city that hadn't been invaded yet.
But as they scooped out the area it soon proved to be just as dangerous as the rest of the city for the area was swarming with Foot bots.
"Think we can go around them?" Karai asked.
"I'm guessing no" said Leo, pointing to the rooftops across the street from them. Staring down at them from above was a squad of archers.
The archers quickly opened fire, forcing Karai and Leo take off running. Tearing through any Foot bot unfortunate enough to get in their way the pair found themselves in a construction site.
"Leo…" Karai started.
"Yeah, I know" Leo interrupted.
She didn't have to say it. The archers had simply been a setup, they had known which way they were coming from and had been driving them right into position. For the moment they stepped into the construction site, Karai and Leo found themselves surrounded by countless Foot bots and looking down on them from a rooftop were Tiger Claw, Kitsune, Fish Face, Rahzar, and worst of all Shredder himself.
Barely managing to escape the Kraang ship, Casey and Raph were forced to take cover in an alleyway. For a moment it looked like they could finally catch their breath, but the universe wasn't done messing with them yet.
For at that very moment a giant portal – large enough to be seen anywhere in the city, opened up allowing even more soldiers through and even Kraang Prime herself.
Kraang Prime: "Yes, Kraang Prime returns to Earth!"
"You got some kind of plan to fight that?" Casey asked Raph, hoping against all hope that he did.
"Uh, not really no" Raph said nervously.
With no chance against Kraang Prime's giant Kraang droid, Casey and Raph backed further into the alleyway staying hidden from the alien leader. They could only watch as Kraang Prime loomed over them, focusing on the closest group of frightened humans she could find.
Kraang Prime: "People of Earth, the Kraang-forming of your world is about to begin."
Taking aim, she fired the latest addition to her personal mechanical body, a cannon connected to a giant tank of mutagen attached to the top of her ultimate Kraang droid. Raph and Casey could only watch in horror as the mutagen turned innocent people into horrific twisted Kraang human hybrids.
"Now that is really messed up" said Casey, as he and Raph could only watch as the city descended into chaos.