Hey all I wrote this during my third snow day of the school year because I knew most of you were anticipating this part. I don't own The Monster by Eminem and Rihanna or TMNT.

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"Call me crazy but I had this vision that one day I'd walk amongst you a regular civilian."

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The Monster

Chapter 3: Birth of a Beast

Donatello was the smartest turtle and there was not doubt about this statement, you couldn't prove it wrong if you tried.

He had the lab, the plans, the inventions, the skill, and the solutions that could save Mikey from Shellacne and mutants from there deformed bodies.

None of the turtles had to be afraid of much regarding the topic if health because Donnie would always take care of it, Donnie would always save them and that was a great thing.

The real question in this though is would Donatello be able to save himself?

For the past hours, all through the night the brainiest turtle had been pacing his lair in frustration wondering what he should do. A freshly brewed batch of retro-mutagen sat in the middle of the lab on a table and he had to decide whether to use it to free Timothy from his mutant enslavement, or corrupt himself.

Don, as smart as he was, didn't exactly know what would happen if he used the solution on himself but he had a vague idea. The retro-mutagen was supposed to turn him human even though his true form was a regular turtle. The solution to that was that this batch was made specially so that you would only turn human considering that every single other monster he had to turn back was originally human in the first place.

Why would he want to become human in the first place is a question that replayed in his mind throughout the night but he always spit back out the same answer. April O'Neil, and her punk human boyfriend were all the motivation Donnie needed but would he really give up a lifetime of ninjutsu and brothers just to be with the blue eyed beauty?

It was all so confusing to Donatello, just like training.

Leo, Raph, and Mikey always had gotten the knack of training quicker and he couldn't recall every special individual session he'd held with Splinter because he needed extra help.

Often he felt overlooked by his Sensei because even Mikey progressed faster than him.

Maybe he'd be better off as a human...

He's still have his ninja skills, just not the agility and power that came with being a mutant but there was one thing he'd lose that nothing in the real world could ever replace.

His family.

Leonardo, Raphael, Michelangelo, Master Splinter. His brothers and father would never agree with Donatello leaving them. They needed him more than he'd ever know.

"I'm not doing this..." The purple masked mutant sighed as he picked up the canister holding the solution and walked slowly over to Pulverizer, ready to change him back.

"Ready Tim? This is the moment we've been waiting for..." Don trailed off as an idea filled his head.

He ran away from the blob's chamber and set the retro-mutagen down on a table where most of his blueprints for new inventions were scattered around.

The plan was simple.

Donatello would transform into a human using the retro-mutagen and show April how he really felt about her as a human where she'd most definitely fall for him and dump her lame boyfriend. Then once he had her where he wanted her which shouldn't take very long, he'd transform back with mutagen that he would specially alter so he'd become a mutant turtle again! Then him and April could be happy.

Simple.

Donnie laughed with glee as he stirred up a potent dose of his latest creation that, in his chocolatey eyes, was to be used for a great cause. He would finally be with April...

With grace and ease, Don poured the liquid into a needle that he would inject into his palm so the transformation would begin. He could hear his brothers outside and predicted what they were doing.

Raph was most certainly beating on Mikey or his dummy that was hanging in the living room of the lair, attempting to disrupt Leo while he finished watching the first season of Space Heroes for the two-hundred-fifty-second time. Normal routine for the other three ninjas.

He felt bad for leaving them so abruptly but in all due time, he'd be back. Once he was human he'd scribble down a note or something, an excuse for his absence, and leave to find April who was probably at school.

Taking one last glance at Timothy's forlorn yet angered eye stalks, the turtle picked up the needle and plunged it into his palm.

As soon as the sharp tip pierced through Donatello's rough green skin he knew something was wrong when his palm started to spew blood wildly. He tried to take the needle from his bloody hand but a large, painful rush consumed his entire body and he threw himself upon the table.

Donnie's fingers morphed together like a normal five fingered hand except for the fact that they were massively large and deadly claws. His thumb claw that had been holding the needle uncontrollably dragged the tip around his right wrist and arm, more blood flew from his wounds.

The scientist through his piercing screams could feel himself grow to a mountainous height, his head could probably touch the ceiling in the lair.

Smaller claws grew on his feet and he swiped at the air in turmoil, making his purple mask a long and raggedy mess even if it was still clinging around his face.

Donatello screamed out wildly as a searing pain erupted from his lower back as a long, strong, and wiggly tail emerged, but his screams got darker and more twisted by the minuet.

His normal green skin had turned a darker mix of deep green and a murky gray with a tinge of blood sprinkled around.

Don could finally feel a pain like when you get your wisdom teeth out in his mouth as his teeth grew into sharp fangs, his signature gap replaced by a fang. Making his way, tripping and stumbling over to Tim's canister where he could see his reflection, the newly formed beasts chocolate brown eyes rolled into the back of his head and were replaced by red to match the blood that he was smeared with.

The monster stood up, towering over his lab items, and to show that he had completed his transformation, roared and unearthly roar that shook all contents of the room.

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"How loud does Donnie have to be each time he creates a batch of retro-mutagen!" Raph snorted angrily.

"Do you think he created another apple mutant?" Leo joked.

"Maybe!" Mikey spoke up.

"Maybe he did I heard a roar!"

"We all heard it, Mikey. I'm pretty sure Shredder heard it all the way from Japan."

Mikey rolled his eyes at Raph's comment.

"Let's go check on him." The leader sighed as he picked up his swords from the floor.

The three brothers walked to the lab door, unaware of the horror on the other side, and opened it up. There in front of them was a beast towering over them, breathing heavily with clawed fists clenched.

The trio stood for a moment, immobilized by fear and questions that weighed them down immensely. That monster was obviously Donatello.

"Donnie?..." Michelangelo croaked.

Beastly Donnie seemed to analyze his brothers carefully as he stood over them. Memories of all the bad things they ever said or did to him flooded back into the small memory of his life that he had and his reddened eyes narrowed and his fanged teeth bared as a low growl escaped his throat.

"How did this even...happen?" Raphael breathed.

"It doesn't matter. We have to do something and we have to do it-AUUUGH!" Leonardo was cut off by a large tail that had slapped him against the hard walls of the lab.

At the sight of this, the other two brothers flew into battle against their deranged brother. Unfortunately for them, Donnie still knew all his old fighting techniques and with his dramatically increased strength and unstable mind, he could easily kill one of them.

Unsheathing his Bō Staff which didn't exactly fit his current size, Don hammered Raph into the ground after about three tries since the hotheaded turtle had been darting around.

"Uh oh..." The youngest turtle said as the monster advanced on him.

"Mikey...run" Leo whimpered from where he was nearly imprinted in the wall.

Suddenly the beast charged towards the door which Mikey was blocking. The littlest turtle screamed and ducked as Donnie nearly ran over him and out into the lair.

"He's getting away!" Raph coughed as he stood up.

Leonardo, Raphael, and Michelangelo peered into the main living space of their home to see "Donatello" making a wreck of the place.

The kitchen table was broken in half with giant claw marks covering it, the fridge was knocked over, Raph's fighting dummy was on the floor, comic books or at least scraps of them laid around, and the pool of water across the lair had a reddish tinge in it.

Donatello was absolutely nowhere to be found, only a trail of blood droplets leading out of their home into the sewers.

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With an absurd yet unknown amount of mutagen and uncertain elixirs coursing through his veins and bloodstream, Donatello ran on all fours through the sewer tunnels.

Any other creature around him in the sewers was alerted of his presence due to the scraping sound his claws made as they hit the ground.

Only one thought rang through his mind.

April O'Neil.

Donnie knew she was at school and he knew that even if he was like this his goal all along was to get April and that's exactly what he was going to do.

A small beam of light shone down from the busy street above and Don stood up on his hind legs to remove the manhole cover that separated him from the world.

Time to fetch April.

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...and the next chapter is already underway! I'm so happy! I still Fangirl over monster Donnie just as much as mutant Donnie and I can't wait to write more of him. Until then, review, review, review! ~PurpleKittyFangirl