Hello! For any who read my other stories, don't worry, I'll try not to slack off. But when inspiration hits, it hits, and I can't choose which fandom it hits for. So, hopefully you like this story, everyone! I started off the first chapter strong, and I'll have every chapter be an episode of the show. Enjoy, and please review!

Chapter 1: The Alien Agenda

A figure sat in a darkened dojo, light emanating from the patterned panels surrounding it. Chin length hair dark as the night around her, the girl sat cross-legged and meditating. Her breathing measured, her eyes closed, she was completely immersed in her calmed state.

One of the panels slid to the side, a Foot soldier entering. He bowed his head to the girl, saying, "Forgive my intrusion, Lynx, but-"

"Shh..." Her voice came softly, but the edge sheathed within was cold and sharp as a knife. "If you must interrupt my meditation, then you will do so without deafening me."

The soldier seemed slightly fearful, but not confused. Many knew that their assassin comrade had famous hearing through the ranks of the Foot. Whispering, he attempted, "My apologies, Lynx. But Master Shredder has asked you to come to America."

Lynx frowned, eyes still closed. "I was under the impression I would only be called into the situation if Karai failed."

The soldier gulped. "I did not question, but she must have. Shredder asked for your presence in New York City."

Lynx finally opened her eyes, showing they were amber, the only clear part of her visible in the lacking light. Her gaze was focused and gleaming harshly like a predatory animal in the bushes. She stood in one fluent movement, nodding sharply to the soldier. "Thank you. I will leave immediately."

The soldier bowed and swept off. Lynx stretched a bit, still lost in thought. Karai wouldn't lose. She probably just wanted company. However, it's been a long time since I've had contact with any mutants. Let's hope they'll be as challenging as the last.

Walking out of the dojo, she walked outside where the moon was just rising, casting light on her full appearance. Eyes haunted by vertical black tattoos like claw marks and her black armor glinting slightly, she matched Karai's armor in all but color. Looking up at the moon, she murmured, "Another night, another kill to be had."

Soon after, a plane touched down in New York City, letting a teenage girl with a hoodie and jeans over her armor. The people at the metal detectors didn't dare challenge her in either Japan or New York- the Foot Clan's mark on her jacket was unique to the clan.

Lynx walked through without trouble, quickly making her way out of the airport and followed her directions to what appeared to be an old church.

She knocked to be welcomed by Foot soldiers, ushering her into the throne room. Lynx moved down the long walk quickly, Fishface circling beneath in the water.

Near the foot of the stairs, Lynx knelt on one knee, bowing her head respectfully. "Master, I have answered your summons."

Shredder looked down from his throne, smiling grimly at the sight of her. Never before had Lynx failed in a mission. "Karai has failed. I will not make the mistake to bring the reinforcement my regiments need when they need it."

Lynx looked up, smiling cruelly. "Then it's good you called me, Master. I will end these mutants swiftly."

Shredder informed, "Karai has gone on patrol. When she returns, I will ask her to bring you to speed. Until then, you will remain here."

He gestured to the steps, Lynx bowing her head once more. "Understood, Master." She took a seat on the steps, sitting proud. This is where I belong. At the cusp of greatness.

Suddenly, a scraggly black man with glasses came in, a large box with controls on top around his neck. Barely managing to open the door, his frail voice came weakly from the end of the room. "Hello, Master Shredder! I believe I've finished the legs for Xever!"

The fish came up to the surface, grinning creepily. "Yas! I will walk again!"

Shredder nodded. "Then proceed."

A large dog mutant carried in a pair of silver robotic legs. Lynx couldn't help but smirk. So many mutants. They're everywhere. Perhaps this will be entertaining.

The dog came near Lynx, scowling at her. "Who the hell are you?"

Shredder barked, "Show respect, Bradford! Lynx is one of the most proficient ninjas to bear the Foot Clan's sigil. Much more a ninja than you were, and thrice what you've become."

Lynx smiled slyly at Bradford as he growled at her. "You flatter me, Master. Though I'm not sure why you address this mutt as a ninja. He obviously has no abilities regarding stealth or speed."

"Why you little-"

He took a swing at Lynx, but she easily grabbed the side of his fist and swung herself onto his hand. "As I said. No speed."

She snatched a throwing spike from her inside her gauntlet, jabbing it into Bradford's hand. He yelped and pulled back, Lynx flipping off his hand and easily back to her seat on the steps.

Shredder ordered, "Enough! You will not fight amongst yourselves. At least not in front of me or the enemy."

Lynx nodded. "My apologies, Master."

Bradford muttered curses and insults under his breath as he pulled the five-inch spike from his paw.

By the time their squabble had ended, Xever's legs had malfunctioned, Bradford's mood lifting as he saw the failure. Shredder growled, "You are a failure, Stockman. My patience is wearing thin."

Stockman stuttered, "Y-Yes sir, it's just- the control system is proving trickier than-"

"Enough!" Baxter hid behind his controls from Shredder's anger. "If he isn't walking soon, you won't be either."

Karai leapt in from the open window above, Lynx smiling. Karai nodded to her with a meaningful look: later.

She looked to Shredder. "Father, we spotted the turtles fighting some guys in suits. But they were actually slimy, brain squids in robot bodies!"

Lynx deadpanned. Wow, Karai. That was a new one.

Shredder walked down from his throne and ordered, "Your mission is to destroy them and find Splinter! I've even called in Lynx to assist in this. Everything else is a distraction!"

Karai asked, "Distraction? Father, don't you want to know what's going on? Robots and creatures? Splinter's disciples are turtles- mutants! Your own men got turned into hideous freaks, and your best assassin-" she nodded to Lynx- "-is the daughter of two! Don't you think we should be finding out what's going on? I mean, there's more to life than your vendetta."

Lynx narrowed her eyes, whispering to silently to be heard, "Yeah, drag me into it, why don't you?"

Shredder growled, "There is nothing more!" He towered over his daughter, Lynx unable to keep a shiver from tracing her spine. She'd always feared and respected the Shredder, but when his rage was focused on you, fear was most prominent.

He placed a hand on Karai's shoulder. "Have you forgotten what Hamato Yoshi did to me? To us?"

Lynx looked away, unable to watch. She knew what it was like to lose a parent, and both hers, she considered lost to her forever. Knowing Karai felt the same pain had made them good friends through their years in the clan together.

Shredder continued, "Every day that Splinter lives is a stain on our honor that we must wipe clean. Stay focused on your mission, Karai."

Karai replaced her mask. "Yes, Father."

Shredder turned to the mutant on the steps. "Lynx, accompany her."

The girl in black nodded, standing. "As you wish." She placed a matching black mask on her face, leaving only her claw-tattooed eyes.

The two shot outside, Lynx pulling ahead slightly and they quickly disappeared around a corner. However, they didn't immediately start their hunt.

Lynx, around the corner first, hugged Karai quickly as she came around. She softly said, "It's good to have you back at my side."

Karai's eyes narrowed, but Lynx could tell she was smiling underneath. "Same to you. Glad I stalled Father into bringing you here yet?"

Lynx chuckled. "I can already see the appeal. Mutants everywhere, excitement, and all the enemies I can kill. Paradise, my friend. Simply a paradise."

Karai asked, "So did your Mom ever tell you about how she was mutated?"

Lynx gave Karai an annoyed glance. "Yeah, I definitely remember all the details of the stories my mom told me when I was five."

Karai winced. "Sorry, I forgot. Let's just go."

The two nodded, taking off again together, black and silver streaks in the night.

Karai glanced across the rooftops to a green figure. Lynx narrowed her eyes. "Alright, we strike as one or-"

"No."

Lynx turned to her partner. "No?"

Karai repeated, "No, we won't attack. He's fun, Lynx. Besides, I'm curious about the robots from before."

Lynx insisted, "We have orders, Karai."

Karai said, "And I outrank you, so you have new orders: you don't attack the turtle unless there's a threat, and you don't kill him at all until I give you new orders." Her eyes betrayed her smirk.

Lynx scowled. "One of these days..."

Karai lunged forward, going to stand on top of a water tower over the turtle. Lynx swung along the side of the building so to go unseen as she came behind the turtle as he looked to Karai with katanas drawn. "How'd I know you'd show up?"

Karai playfully teased, "Because you're not good at hiding from me."

The turtle asked in response, "Like last night?"

Karai asked cutely, "Oh, were you there? I didn't notice. I did see a bunch of robots though. What's their deal?"

Lynx rolled her eyes. "I think I'm going to be sick."

The turtle whirled, staring at Lynx. "Who the heck are you?"

Karai introduced, "Leonardo, this is my friend, Lynx. She's been assigned to hunt you and your brothers down, but I told her to stand down- for the moment."

Leo glared at her, Lynx glaring back. "What kind of name is Lynx?"

Lynx said in a clipped tone, "One I've earned as a quiet hunter."

Karai suddenly prompted, "So, those aliens?"

Leo warned, "They're incredibly dangerous, Karai. You should stay away from them."

Karai continued the banter, to Lynx's displeasure. "I like them already." Her voice became more serious. "Something else is going on. What is it?"

Leo looked determined. "I'm not sure I should tell you anymore. Raphael says I can't trust you."

Lynx cut in, "Another turtle, I assume? Italian Renaissance artist names. How original. And do you always listen to this Raphael?"

Karai admitted, "He makes a good point." She flipped off the tower, landing in front of Leo. "Eventually, I am going to destroy you."

She drew her tanto and the two sparred for a minute, Lynx keeping close watch as they moved rooftops, ready to step in at any moment. She watched with piercing amber eyes that Leo could literally feel the presence of on his back, making his shell crawl with a cold feeling.

Finally, relief came through her body when Karai denied promising to not attack the turtles. At least she hasn't completely lost her mind. We never got into this much crap in Japan, but barely a week apart and New York's turned her insane.

Karai took off her mask to answer Leo. "Loud and clear." She nodded to Lynx and the two leapt over the edge of the building, disappearing.

At the end of the block, Lynx glared at Karai. "What was that?"

Karai seemed genuinely puzzled. "What was what?"

"Your little flirting with that mutant. We have orders, Karai! We-"

"Ugh, always with orders. That's your problem, Lynx. You always follow the rules."

Lynx rebuked, "And here I am, having worked my way up from nothing. Karai, you were born into this. I had to work eight years for my post. I won't give it up now because you have a stupid crush on a turtle."

Karai's blush slipped around her mask. "Shut up! I'm just toying with him, getting in his mind before we defeat them!"

Lynx growled, "You'd better be. Because I won't lose my hard work to a goddamn reptile playing hero."

Karai and Lynx tailed the turtles to the Worldwide Genome Project, sneaking into the building right after them. Yet the moment they came into the room of mutagen, Lynx blinked, stunned. "Mutagen. Green, horrible liquid that turns you into a monster."

"That sounds... scary."

Lynx remembered the sharp feeling of pain on her cheek. "Never show weakness, not even to me!"

Lynx snapped out of her memory, reaching and touching her mask over her cheek.

Karai whispered, "What's up?"

Lynx shook her head, then motioned forward. They moved to stand on the mutagen over the turtles, yet Lynx's mind swam with her mother's words again and again. Mutagen, mutagen, mutagen...

"Got ya!" Lynx was tackled down, a turtle over her as they tumbled to the floor. Lynx quickly flipped so Raph was under her as they hit the ground, Karai leaping down to her friend's side as Lynx pinned the red-banded turtle.

Leo exclaimed, "Karai!"

Donnie echoed, "Ka-who?"

Raphael managed to twist himself free of Lynx's grasp, pushing her back to stand ready to fight.

Lynx sarcastically asked, "Can I hurt a turtle now?"

Karai nodded. "Have fun, Lynx."

Donnie echoed again, "Links?"

Mikey perked. "Sausage links?"

Lynx drew several throwing needles to her hands, throwing at Raph. Two bounced off his sais, the other two catching in his shell. Scowling, he lunged forward with his sais out, but Lynx slipped her hands to her thighs, pulling something from an unseen pocket. She slipped her hands between each of the sais, twisting so they pulled out of his hands and him forward. She kneed him in the gut, wincing at the hardness of his shell.

In her hands, a straight piece of metal on a ring around each of her middle fingers had helped her snatch the sais away and toss them to the ground. She quickly jabbed the metal into his inner shoulder, just above the shell.

Raph groaned, falling to his knees. His arms felt numb from the sudden wrenching of his weapons and the jabs, small streams of red from his arm temporarily stunned from the attack.

Lynx stood over Raph, gripping her metal weapons. "My shobo work on your pressure points, turtle. You're humanoid enough for that."

Leo demanded, "Karai, call her off my brother!"

Karai chuckled. "No can do, Leo."

Leo jumped to his brother's defense, putting a katana to the back of Lynx's neck. "Drop the- things."

Lynx whirled, kicking Leo's weapon away. She attempted to get close enough to use her shobo, but Leo knew her trick now, keeping her at sword-length.

Donnie cried, "Okay, what the heck is going on here? How do they know these girls?"

Mikey joined, "Yeah, and how do we know them? Wait, do we know them?"

Leo suddenly managed to push Lynx back, knocking the flat side of his katana into her, making the girl roll back.

Leo ordered, "Enough! You're going to set off-" Lynx leapt forward again, kicking him squarely in the chest to lean against the control board and-

Alarms blared, making Lynx clutch her ears and wince. Leo groaned, "One of those."

Raph managed to stand, wincing at his still sore wounds. "You're taking their side?! What is wrong with you? They're bad news!"

Lynx's voice wasn't as strong, but she'd forced herself not to show her weakness. "Yeah, we are."

Karai saw her friend's discomfort, blasting the siren so it would silence. Lynx gave her a grateful nod, taking a battle stance again.

Droids invaded the room, surrounding the two groups.

A droid rattled off, "The ones who are not authorized by the authority of Kraang to exist in this place shall now be destroyed by Kraang in this place."

Lynx froze for a moment, horror in her heart. Kraang. I remember. That's what mother called the monsters who mutated her and Father.

It wasn't often that Lynx felt angry, but this was one of those times. She had no hesitation to lunge forward in attack, slipping away her shobos for throwing spikes. Each of the four flung from each hand hit, a small red light appearing and detonating, destroying its victim's body. Kraang squealed as they ran from their broken hosts, Lynx quickly drawing their fallen weapons. Firing at all opponents, rage shone in her amber eyes as she shot wildly at the aliens.

Karai blinked before joining the attack, surprised. Never. I've never seen Lynx get this worked up. What's her deal? I can't see these puny aliens fazing her...

The turtles weren't spared from Lynx's assault. She intentionally avoided Karai, but if her shots should come toward the turtles, she didn't hesitate.

Karai bantered with the turtles, but Lynx was focused, her mind only on victory. Until...

"What happens if I do... this?" Karai had her finger over a button on the control panel. Lynx paused, wanting to see the ending to this horrible choice of Karai's.

"No!"

"Don't do that!"

"Highly undesirable outcome."

Karai confessed, "Well now, I gotta." She pushed the button, DNA from all sides going to mix in the mutagen horde.

Lynx pulled back as a tentacled monster emerged from the vat, Karai withdrawing to the turtles' side as the resulting monster... meowed.

Mikey coddled, "Aw, he's so cute!"

The creature rose, roaring. As a tentacle reached for the group, Lynx shot it in the eye to distract it, though there was little reaction.

Karai admired, "Wow. That is wicked!"

Mikey fretted, "How the heck am I going to name this?!"

Karai mocked, "Good question... Well, see ya." She grabbed a Kraang's torso, jumping up to Lynx. "Oooh, I like your new weapon."

Lynx ignored her. "This is why we don't press random buttons or show mercy to annoying turtles, Karai."

Leo demanded, "You're not going to help us beat this thing? It's your fault!"

Karai taunted, "I'll let the heroes handle it!"

Leo looked outraged and betrayed, making Lynx scoff. He screamed, "I trusted you!"

Karai laughed, "I know! That's messed up, right?"

She ran off, Lynx lingering to yell, "Word of advice, reptile: trust only those who earn it! Not that you'll need that advice in the grave." And she quickly followed Karai.

"I should've told you about Karai sooner, but I really thought there was a chance she would be good!" He paused. "And I guess I sort of liked her." Leo looked away from his audience. "Go ahead. Laugh."

Mikey wondered, "Dude, I can't believe you trusted her."

Donnie agreed, "I can't believe you didn't trust us enough to tell us."

Leo admitted, "I was wrong. I'm really sorry."

April announced, "I tried to warn him."

Raph asked, "You too, huh?"

Splinter interjected, "What of this Lynx you mentioned?"

Raph scowled, rubbing his sore limbs. "Yeah, going to try to be her girlfriend too?"

Leo flushed slightly. "No! I've learned my lesson. She even called out that I shouldn't trust her."

Donnie asked, "And you're listening to her too now, huh?"

Splinter interrupted, "That's enough." He stood in front of Leo. "Leonardo, you are not the first boy, or turtle, to make a fool out of yourself in front of a girl."

Mikey asked, "How about Donnie? Ow!"

Splinter continued, "However, when that girl is a kunoichi in the employ of your enemy, that is an error you cannot afford."

Leo bowed his head. "Hai, Sensei."

A few minutes later, Leo was about to go for a walk when Raph stopped him. "I'm glad you came to your senses."

Leo rubbed the back of his head. "You were right. I don't know what I was thinking."

Raph admitted, "I can see how you'd think she's hot. In an evil kind of a way." He chuckled. "Though that Lynx was worse."

Leo frowned. "Hot or evil?"

Raph blinked, considering. "... Both." The two laughed.

Leo assured, "Well, don't worry. I'm so over that." Yet both Karai's brown eyes and Lynx's gold ones still haunted his thoughts.

Back in Shredder's lair, Karai and Lynx carried in a robotic torso, tossing it next to Stockman.

Karai excitedly said, "The robots. I've seen them up close! They call themselves the Kraang."

Shredder insisted, "I told you I am not interested in this robot fiction! I will hear no more of this! And Lynx, you are an asset because you stay focused. Where was your focus on our enemies now?!"

The girl bowed her head. "Apologies, Master. I would not let Karai face these aliens alone, so I left my mission to ensure her safety."

Karai interjected, "And that doesn't matter now." She flung a slice of metal to Stockman. "This is how they control their robot bodies. You can, I don't know, use it?"

Baxter played with the controls like a giddy child, exclaiming, "This is exactly the sort of neural transmission interface I've been trying to develop!"

Shredder considered the technology. "Very well. I want you to find out all you can about this... Kraang. Their technology might prove useful in our war against the turtles. Well done, Karai."

Karai smiled, Lynx glancing away. She didn't get much credit while partnering with Karai, but she was okay with that. Karai had her resume, Lynx had hers. And soon, she was going to add four new tallies to her count of successful kills.