A/N: Hey Magicwinter here! I hope u guys like this story I just thought that maybe if the turtles here met a runaway experiment from area 51 what would happen? I dont know anything about advance science stuff so just bear with me! okay so two more things:

I DO NOT own TMNT or any of the characters except my OC's

And enjoy my substandard story!

A lone figure darted across the roof tops, while others tailed it. It breathed ragged breaths through it's barely human mouth. Fangs and saliva bordered its snarl as it ran for dear life. It had inhuman green eyes and black fur covering it's body. It also wore a one piece black suit. Even though it was humanoid it still ran awkwardly on all fours.

"Don't let it get away!" A soldier wearing a battle suit shouted. He pointed a wrist at the creature and a large hooked needle shot out and imbedded itself in the thing's skin. It hissed.

Any normal thing would have doubled over with pain. But obviously this thing wasn't normal. It only paused for a brief moment to rid it's leg of the mini-harpoon, and continued on. The soldiers grew tired... all but one. He pulled ahead of the 15 or so men and gained on the his creation. He was close enough to stab it with a tranquilizer. It skidded a few feet but stayed asleep.

"Bring me the case!" He said.

"Yes Agent Bishop sir!" A minor soldier replied and brought forward a case which he opened to reveal several syringes.

"This should keep her from reverting." He said to himself as he injected a dark red liquid into it's blood. It immediately changed into a teenage girl with the one piece suit the only thing she was wearing and waist length jet black hair covering her face. Bishop injected the next syringe into her neck and spoke to himself again, "This will give her artificial memories." (A/N: I don't know how just bear with me here!)

She stirred and opened her eyes just enough to see that the colour hadn't changed, and neither had their shape. They looked more like a snake's eyes with the slits for pupils. She still had fangs and sharper pointed finger-nails. Other than that she looked like any other human teenage girl.

Bishop was about to inject the third syringe to change her fully but- "HIYA!"

A ,clearly mutant, shape kicked him out of the way. "This is even beneath you Bishop," a mutant turtle with a blue mask said, "Attacking an innocent girl and putting this into her." He held up the needle with the blue liquid and smashed on the ground.

"YOU FOOL!" Bishop yelled and lunged at him. A red clad turtle blocked him and sent him flying off of the building.

"We need to get back to the lair and fast!" A purple-banded turtle told the others while they fought.

An orange masked one responded,"Wow Don state the obvious much?"

"No, look!" Don said. He was right she was heavily bleeding from her leg where the harpoon had cut her, and her face was fixed in a grimace.

"Me and Raph will hold them off!"the blue one ordered as he kicked a soldier in the chest," Mikey help Don get her to the sewers!"

"You got it Leo!" The orange Mikey said as he leapt over to Don.

A darkened figure tossed them away and said, "She is not going anywhere! She's a danger to the people in this city!" Bishop stood defensively in front of her, but suddenly fell to the ground with the girl standing behind his fallen figure. Her mutant, green eyes were opened wide to reveal the pupils invisibly thin.

She had hit him in the back of the head with her claws. She turned her gaze to the turtles and her pupils went wider, almost normal. And she fainted.

"Leo! She's obviously not normal!" Don warned. The turtles were back in the lair. They had brought the strange girl.

Leo and Don were discussing what to do While Raph and Mikey played video games.

"I know but it's probably what Bishop was injecting her with that made her that way! And we can't expect him to just change her back to normal!" Leo argued.

"I have to agree with Leo," Raph piped in, "We can't just give her back to that wacko."

Mikey intervened next "Yeah well, I think Dons got a point. In movies the guys who take pity on the stranger always get slashed!"

"You saw what she did to Bishop!" Don said.

Leo put his foot down on the matter, "We have no choice Don! Besides we're mutants too!"

"Yeah, but she's Bishop's mutant!" Mikey pointed out.

"Yeah, I guess, but she's already here and that makes her a guest."

"Fine, Leo but I'm still going to keep a careful eye on her." Don said eyeballing the room she was sleeping in.

Agent Bishop and his men were back at area 51 preparing another subject.

"Doctor Stockman!" Bishop scowled as the robotic skeleton approached him, "Subject 313 has escaped. Do you know how?"

"No. I don't believe I do." The robotic-yet-human voice of Baxter Stockman answered but it was evident he was hiding something.

"A bomb exploded while we were stopped in the hidden base at New York. It was a remote controlled explosive."

"Do you need me to work on the new project?" The brain responded, trying to change the subject.

"No. I think you had a hand in this. You did insist that we should release it in New York." Bishop replied to the out-of-character doctor.

"D-did I say that?"

"Yes you did. However this maybe interesting and since I can't dispose of you yet I'm willing to let this slide beneath the carpet."

"So... Project 314 is a go?"

"Affirmative." Bishop said heading to the door but stopped and added, "Keep a satellite video feed on the New York area, I want to see the fruits of your little mistake."

He left a smug Doctor Stockman to work on his latest genetic experiment.

"Hey Don, Leo! Oh and you to Raph!" Mikey called to them, "I think she's waking up!"

"She is?"

"Hmm."

"He better be right."

All three of them chattered in nonsense as the abandon whatever they were doing and went over to the room where their strange guest was sleeping.

She stirred and tried to push herself into a sitting position, but grunted when her leg protested.

Don rushed to the side of the small cot she was lying on, "Hey! Careful, your leg was slashed last night. Remember?"

She opened her eyes and looked at him. Her gaze turned ridged as she saw the bo staff on his back. She instantly swatted him into the door way, where he crashed into Raph.

"Hey what the shell are you doing!" Leo demanded.

She crouched on the floor and launched herself at Leo. Mikey pulled him out of the doorway and slammed the door. She kept assaulting the door from the other side trying to get through.

"See! I told you Leo. She's dangerous!" Donny exclaimed throwing his hands in the air. He ran to his lab and quickly returned to the place where all three of his brothers were holding the door to keep her inside the confines of their guest room. "Open the door."

Raph looked at him, "Are you crazy? We can't-"

"Just do it!"

As they pulled open the door the girl leapt out and Don tranquilized her.

Leo looked relieved, "Thanks Don. But now what do we do? We can't put her in the streets. We can't give her to the authorities. And we can NOT keep her here."

"Well, I'll secure the room so we're safe than..." Don's voice trailed off. He didn't know what to do.

None of them did. They were starting to think that Bishop was right. But none of them would EVER admit it. EVER!

It was about a day later. All four of the turtles were on a midnight run. They needed to clear their heads and decide what to do about their 'guest'. In the back of their minds was a god forbidden thought that kept nagging at their thoughts. 'Give her back to Bishop.' but none of them could ever even bear to have that thought in her mind without instantly feeling guilty.

"Guys. Look." Leo said and pointed to some purple dragons doing their thing. And now it was time for the turtles to do their thing. "Let's go."

Meanwhile back at the lair Master Splinter was curious as to what the 'guest' was doing because her room had been very quiet. He had been meditating and was used to the steady thud against the reinforced steel door. but now all was quiet. He tried to ignore it but curiosity's annoying prick had left him no peace. He got up from his mat and walked to the door. he pressed his ear against the surface and still nothing. "Hmm..." he rested his hand upon the door. But removed it upon better judgement. As he turned back to his room he took one last wistful glance at the door handle.

"Heh. Bustin' up dose purple dragons actually made me feel a bit better." Raph seemed to brighten up a bit since the beginning of their predicament.

All of them seemed to feel a bit better. They ran along in a comfortable silence. No more trouble seemed to pop up, so the turtles eventually decided to head home.

Just before they opened the lair they heard Master Splinter's voice.

"Is that Master Splinter?" Mikey asked.

Don answered him, "Yeah, but who is he talking to?"

"Guess there's only one way ta find out." Raph told them reaching for the door secret pipe.

"Wait try to hear what he's saying." Leo said pressing his head to the wall.

So is there anything else you can remember?

...

Are you sure there is nothing else?

...

Very well. My sons should be home soon. I will introduce you to them.

... Nothing

"Let's go in now." Leo said.

He opened the door and looked curiously for his father and whoever he was talking to. His eyes rested on his father sitting at the table sipping tea with none other than their special 'guest'.

A/N: Hey i hope you guys like this story. It was just some random idea i had. I might dabble with another idea but it won't be related to this one. Reviews mean longer chapters! Just sayin' R&R ppl!