Disclaimer: I don't own the Turtles (sob sob) but OCs are MINE, all MINE! Mwahaha!

Raph roared as he punched a Purple Dragon in the guts. The man, who was more of a walking tattoo, yelped as he flew backwards and collided with a wall. Raph had just enough time to unleash a spinning kick that succeeded in snapping the necks of two more gang members before the tattoo man had leapt up to face him again.

He glanced around at his brothers. Leo had just driven his katanas through the stomach of another Purple Dragon whilst Donnie and Mikey faced Hun. Shock slowly crept in on him as men poured from warehouses and trucks.

We've never fought this many before, he thought as he blocked another hit with his sai. He saw his brothers take hits to their arms and legs but keep fighting bravely. We should be able to take 'em, but this is gonna be tricky…

He slashed his sai through the tattoo man's throat and suddenly felt his arms being grabbed from behind. Hey, what da shell! He struggled furiously against his opponent's grip, but couldn't get free. He could see a heavily built Purple Dragon approaching with a baseball bat gripped in one muscled hand. Oh fuckfuckfuck. Fuck.

He could see his brothers, several metres away. A wall of Purple Dragons kept them from helping him. He writhed desperately, but his captor stayed firm.

FUCKFUCKFUCK!

The man in front of him smiled. Not in a friendly way, but in an "I'm going to enjoy hurting you" way. He raised his bat. Swung-

And was knocked backwards by a black shape that dropped in from above, clawing at his face. He tried to swat at it with the bat and screamed in pain as whatever it was that had attacked him sank its teeth into his arm, severing the muscle tendons. The man who had been holding Raph released him and lunged at his new foe, but whatever it was leapt over his head and landed behind him, dragging its claws down his back.

Raph watched, impressed. It looks human, but a human don't move like that – if only it'd slow down so's I could get a proper look… Suddenly he saw the muscled Purple Dragon lumbering towards him, waving the bat in his good hand. Aw shell, I'm still in the fight. Raph ducked and the man, already woozy from loss of blood, tripped over him. Raph quickly kicked him in the head, knocking him out, and leapt back into the fray.

The rest of the Purple Dragons, seeing that they were now losing, turned tail and ran. The turtles' new ally bounded over the rabble and landed neatly on the ground, a few metres from Raph. At last, he turned and took a good look.

It was skinny girl of about fifteen, dressed all in black; black turtleneck, black combat trousers and black trainers. Her hands were stained with blood. Raph looked at them and was startled to see that her three-inch-long nails seemed to be retracting into her fingers. Holy shell, dey's like cat's claws. Her looked at her face and jumped. Underneath an unruly mop of chin length blonde hair were two yellow eyes with slitted pupils, and as she opened her mouth he saw two rows of unnaturally pointed teeth. Shell… cat's eyes too. What IS she?

The girl caught sight of him looking at her, and suddenly her nails shortened to a normal length, her teeth became normal and blunt, and her eyes were blue with round pupils. She watched him with an expression, not of shock like most people seeing the turtles for the first time, but of mere curiosity. Raph sensed Leo, Donnie and Mikey behind him, staring at her with the same feeling of bemusement that he felt. For a long moment, no-one said anything.

Suddenly, a brick sailed through the air towards her. Raph turned and saw a lone Purple Dragon sprinting off. Coward. With lightning fast reactions, the girl dodged the brick, jumped up, bounced off a fire escape over the roof of the building she had stood next to and was gone.

The turtles blinked at the spot where she had been in some amazement.

"Who was that?" asked Leo.

"I don't know," mused Don, "but whoever she was, she wasn't exactly human. You saw how fast she moved."

"And her eyes." added Raph. The others looked at him quizzically. "You guys didn't see? She ain't normal, her eyes went all yellow and slitted, like a cat, and den dey was ordinary."

Mikey grinned. "Awesome! Maybe she's like Catwoman's kid sister, or her daughter. Or like a clone of Catwoman. Did Catwoman ever get cloned? That would be cool."

"Well whoever, or whatever she was, she's gone." Leo shrugged. "There's no point hanging around here."

She watched them from the shadows. What were they? They walk on two legs, they fight with two hands… maybe they're a new species. Or maybe they're like me, and they were born human or born as tortoises or something, but they changed. I can smell mutagen on them, so I guess that makes sense.

She sat there for a moment, watching them. She was sure she had never seen them before, but for some reason they brought back vague memories; a stone dwelling with rivers running through it and no windows, and a certain assured feeling. She could trust them. She didn't know how she knew that, but she could trust them.

So it didn't surprise her especially when they began to talk to each other. They speak English. Hmm. She listened to them talking about her, trying to gain some clue about their personalities, their identities, but she learned nothing. Catwoman! Cheek, she's an amateur compared to me. And a slutty one at that.

They turned to leave. Shit, now I'll have to follow them… Okay, that made me sound like a stalker. I can't follow them, I have a life! Heh, almost convinced myself for a second. They jumped up and started to run over the rooftops. I love how they go together, like friends. Or a family. Oh hell, I've missed that word. Bye bye, weird tortoise people… The only people in the world stranger than me.