I have actually had this story idea for a long time, it just took forever to figure out how to do it. Thank you to all of those who sent me birthday wishes. You guys made my day. If you are into Greek Mythology, I would suggest reading the book I told you about in the first chapter to get an idea of what is going to happen. Let the suspense begin.

"I don't understand" Leo said "That was obviously mutagen that hit Donnie. It was glowing and everything"

Donnie winced in his sleep as Splinter started to pull the glass shards out of his sons plastron.

"Maybe it was expired" Mikey said

"How can mutagen expire?" Raph snorted. He hated that after all they had been through weeks before, he still wasn't able to protect his younger brother.

Splinter pulled the last piece of glass out of Donnie as he began to disinfect the wounds. Donnie winced again, but still didn't wake up.

"How is he still asleep is my question" Raph stated "Maybe it was some sort of sleeping liquid or something like that"

"Then why did he get those burns from it?" Leo asked "He was in so much pain, that I swear that's what everyone else who has been exposed to mutagen looked and sounded like"

Splinter began to wrap Donnie's plastron to keep the burn marks and cuts clean. Donnie groaned as he cracked his eyes open.

"What...what happened?" he said as he sat up, rubbing his head. He then remembered and franticly looked at himself.

"I was hit with mutagen!" he said "I should not be normal"

"We're not normal brainiac" Raph said walking over to Donnie

"You know what I meant" Donnie said glaring at him. He began to sit all the way up, but doubled over, almost falling on the floor.

Leo caught him before he could face plant, but hit his chest as Donnie yelped in pain.

"Sorry" Leo quickly said laying back down on the couch "You had several pieces of glass stuck in your chest and a major acid burn. You may want to lay down for a day to let those start to heal"

"Yep, maybe" Donnie replied with pain in his voice. He took a deep breath and closed his eyes.

As the others talked about what he might have ben hit with, they didn't realize until he was snoring that Donnie had fallen asleep. Raph grinned as he picked him up bridal style and carried him to his room. Everyone else followed, making sure he was alright, before going to bed themselves.

Later that night...

Donnie woke up with a burning sensation in his plastron. He decided to go to his lab to examen it and see if Splinter had taken care of it properly. What he found, he was unprepared for.

As soon as he walked into his lab he began to undress the wounds on his cheat, before he gasped. Where the vial had broken on his plastron, was...fur! Like, a dogs fur! He quickly took a blood sample and found out what was causing this. The mutagen that had hit him was old, like, almost expired old. It was taking more than 10x as long to mutate his cells. He thought about what the last thing he had touched was. Then he felt the cut on his arm as it hit him, Rahzar.

He knew it wouldn't be long until he was some sort of turtle-human-dog mutant. But what scared him most, was his sudden desire to kill, more specifically, his family. He could feel the desire clawing at his brain, telling him that he would be better of without them. Donnie then decided to do the one thing he thought he would never have to do, shut his family out. He locked the lab door, and knowing that Splinter had a key, barricaded the door with his desk, rolling cabinets, even Timothy. He then fell asleep, knowing he could never be the same again, and could never be with his family.

The next morning...

Mikey decided to make breakfast in bed for Donnie to help him feel better. When he went to his room to give him the food though, he wasn't in there.

"Must be in his lab" Mikey said to himself

When he got to the lab he found the door locked.

"Donnie" he said "I brought you breakfast"

"I'm not hungry" Donnie replied

"But it's your favorite" Mikey said trying to coax him out

"I said I'm not HUNGRY!" Donnie yelled

Mikey was startled at this sudden outburst and fell over, Donnie's breakfast going all over the floor. He sat there for a moment, processing what had just happened, before got up and sadly walked back to the kitchen, the smell of Donnie's coffee fresh in the pot.

That afternoon...

Mikey decided to try to get Donnie out of his room again.

"Donnie" he said (knock 5x) "Do you wanna go see April?" Donnie didn't respond, which was really strange "Come on lets go and hang, I never see you anymore, come out the door, it's like you've run away" Still no sound from Donnie "We used to best buddies, but now we're not, I wish you could tell me why" He tried to look through the key hole in Donnie's door "Do you wanna go see April? It would be just you and April. No Casey!" he practically yelled

"Go away Mikey" Donnie replied

"Ok, fine" Mikey replied, with a defeated look on his face.

On the other side of the door stood Donnie, with fur across his entire body now. It was a black, brown color, with a patch of purple fur where his mask would be. In his hands was his old mask, torn to shreds, along with most of his lab. He didn't want to turn Mikey down, he really didn't. But it was the only way to protect them. The monster that was trying to take over clawed his brain again, telling him he didn't need them, that they only held them back. And with that, he slammed himself onto a wall, and fell unconscious.

A week later, Donnie still hadn't come out of his lab. Everyone knew that he had food in there for when he got so far into his projects he wouldn't leave, but they had no idea how long that would last. Mikey was begging Leo to try and coax him out, and won. Leo walked up to the door of the lab.

(knock 5x) "Do you wanna hang with April?" he asked, getting the same answer as Mikey, nothing "Or take down Shredder and Fong. I think your company is overdue, I've started talking to Splinter about atoms" he expected a chuckle from Donnie, but still nothing "The lair seems so quiet, without explosions. Mikey is going insane"

To prove Leo's point, Mikey screamed, actually sounding insane. Unknown to them, Donnie was looking at himself in the mirror. He now had, adding to his fur, razor sharp claws, pointy ears, and large canine teeth. His eyes were pitch black, looking as if there was no life in them. His want to tear things apart was growing day by day, his lab looked like what all of his parts for inventions came from, a junkyard. Appalled at his new state, and the fact that the monster wanted Mikey's screams to be because of it, he smashed the mirror.

For two weeks, everyone wanted Donnie to come out of his lab, April had even considered trying, but decided to let his brother do that. Mikey was getting really worried, not a word from Donnie since the first time he had tried to get him out of his lab. He missed his best friend and older brother. He missed his nerd rants, and scientific facts. Everyone else had decided to let Donnie come out on his own, but Mikey had not given up. Until today. He decided he would try one last time.

(knock 3x)"Donnie?" Mikey asked "Please, I know your in there. We've all been wondering where you've been. They say 'Don't worry' and I'm trying not to. I'm right out here for you, just let me in" Mikey was on the verge of crying as he leaned against the door frame "We used to have each other, just you and me, what am I gonna do?" a few tears escaped his eyes "Do you wanna go see April?"

He leaned on the door and almost fell over when it actually opened. It took him a minute to process the situation before he swung the door open and began to scan the room for Donnie. There were parts everywhere, claw marks on the walls, and on the door where the lock was. He pulled out his nun-chucks as he walked into the room. He suddenly heard whimpering coming from the farthest corner of the lab. When he looked at the source of the sound, he almost fell over. There in the corner, was a furry creature, with razor sharp claws, a turtle shell, and a patch of purple fur where a mask would go. It took Mikey a minute to put the pieces together.

"Donnie?"

That's right, I just did that. Can I kill myself yet? Please fav, follow, and review.