Hello~ I have been writing this for months, and now I can finally post it! It's set during 'The Lonely Mutation of Baxter Stockman,' and then veers off canon episodes, so Karai is a girl, and Leo has his normal voice, and Tigerclaw is no where's to be found but is probably battling it out through other dimensions. Dogpound is Rahzar, however. That's already happened.

*This whole story is under the headcanon that Irma is a real person and was just kidnapped and impersonated later on. So she's like, human and stuff.

**It's also set with Donnie and Casey not being complete assholes to each other because in the Wormquake episode they're all like "You know what, you're pretty cool *fistbump*" at the end so the rivalry is dumb and they're buds. That doesn't mean that they don't get annoyed at each other from time to time because honestly with Raph being Casey's best friend it's bound to happen.

So, with that, I hope you all enjoy my first chaptered story.

Leo, Donnie and Casey roped down into the warehouse, seeing April tied up over a vat of mutagen.

They heard a slight buzzing as they assessed the scene, looking for the best approach before they heard a slap.

They both jumped at the noise, then turned to glare at Casey, who had killed a fly that was buzzing around.

"Turtles!" Baxter shouted, now aware of their presence, "You tried, yes. Tried to sneak in. No retro-mutagen, no trade!" Baxter buzzed out, flying closer as he did.

"I got your retro-mutaJUNK right here!" Casey shouted, flipping his hockey stick around and playing it like an electric guitar.

Baxter turned around, spitting acid on the rope that held April up before flying to attack.

Casey shot out before the brothers, hockey stick in hand, and the turtles quickly followed suit, rushing forwards after Baxter and April.

Casey got one hit in on Baxter before he was thrown back, and Leo jumped forwards just to be thrown away the same.

Donnie rushed towards April, throwing a grappling hook up to get to her, while Casey had managed to get onto Baxter's back, riding him around the warehouse. He had got a few hits on his head, before being thrown towards Donnie, knocking them both into the boxes.

Leo jumped back into the fray when Baxter began to spit acid, jumping back just in time.

"Baxter, stop!" He tried. "Let us help you! We don't want to hurt you!"

His attempt at reasoning with the fly-mutant was punctuated with Casey throwing a fire extinguisher towards him, snapping his fingers when it missed.

"Well, Casey does."

They were brought back by April, "Uh, guys! A little help here!?"

Donnie sprang into action, grabbing the rope he had thrown earlier and swinging himself up to the top.

"Not fast enough!" Baxter yelled as the rope snapped and April began to fall.

Donnie jumped from where he was, holding his arms out to grab her. When he felt her curled up safely in his arms he gave a silent cheer, tightening his hold as his momentum carried them towards the other side.

"No!" Baxter shouted, grabbing a box and throwing it towards them with all his might.

Unable to move himself out of the way, both he and April were hit full force and thrown back, sinking into the glowing, green liquid.

"DONNIE!" Leo shouted, stopping dead.

"APRIL!" Casey did the same.

Everything was stopped as they watched the two forms sink to the bottom, even Baxter, unsure of what would happen to the two teens.

"You BASTARD!" Casey screamed, taking his chance and throwing his hockey stick up at the mutated fly. He hit him dead center and threw him through the warehouse window with a crash.

Leo climbed up the canister, ignoring everything else. He knelt down next to the green goo, tears in his eyes.

"DONNIE!" He screamed at it, looking as if he wanted to reach in, but stopping himself last second. "DAMN IT!" He screamed, standing back up and turning away, gripping at his head.

"How could I let this happen?!" He screamed at no one in particular.

"Are they…" Casey asked when he joined him on the side, and they would soon find their answer as one form latched onto the side of the canister.

Leo turned back around at the sound and reached for his sword, unsure of what had become of either his brother or friend.

The figure coughed after a moment, the bubble around them bursting for the boys to find a perfectly normal April.

She coughed up more mutagen, rubbing some from her eyes as well. "Nice catch, Donnie." She shouted; annoyance clear in her voice. She shook some more off before dragging herself up onto the side.

She looked around after a moment, expecting some explanation about why she was okay from the purple clad turtle, but he wasn't there.

"Where's Donnie?" She asked, suddenly no longer angry or annoyed, and Casey looked towards the oldest brother, still looking desperately at the vat of mutagen.

"He fell in too?" She asked, her eyes widening.

They waited a couple more seconds before April couldn't stand it anymore. She reached back into Mutagen, throwing any bit of caution away, everything leading up to that point had proved her to be immune.

She latched onto a figure, pulling it up with all her strength, but not able to get him past the side of the canister.

"Donnie?" Leo choked out, his hand shaking on the hilt of his sword, not wanting to have to attack his younger brother. April couldn't help but wince at how terrified he sounded; an emotion she didn't normally get from him.

Another cough was heard, this one weaker but loud enough to pull April from her thoughts.

She moved closer and attempted to clean some of the mess, giving a small gasp as her hand moved the mutagen away, only to find something that looked and felt like brown hair.

Quickly rubbing the green liquid from the rest of his face, she found a normal human boy behind it. She looked up to Leo, desperately looking for any answers, but he just looked confused, wiping the few tears off his eyes quickly.

After a moment he seemed to shake himself out of it, and looked towards Casey.

"Casey, go find a blanket or something!" He shouted, knowing that mutagen didn't just make clothing, though as April cleaned a bit more mutagen away he noticed his shoulder strap still hanging to him and his mask hung around his neck.

Casey jumped down, returning a moment later and draped the tarp he had found over Donnie's shoulders after they removed his weapon from its holster. Leo scooped him up after, thankful that he was much smaller and lighter without the shell attached to his back.

"Come on, let's go!" Leo shouted, running out the doors and towards the Shellraiser, just as Baxter reappeared from the window.

"No, you won't get away that easy!" He shouted throwing a led pipe at the canister, cracking it upon impact.

He quickly flew after them as the doors were shut, ignoring the ever growing cracks on the mutagen holder, even when it began leaking out.

Leo set Donnie in Raphael's seat, making sure he was secure before taking his own in the front, starting the car and shooting off down the street.

"Donnie," April pleaded, grabbing a cloth from one of the compartments and cleaning off some more of the mutagen. "Come on, wake up." She told him, shaking his shoulders.

She heard a phone go off, and listened as Leo answered it while he was driving.

"Oh, you found him?" She heard him say, and turned around. "We'll be there as soon as we can, but we have a bit of a problem over here..."

There was silence for a moment before Leo winced. "Uh, I'll show you when we get there.."

"Leo! He's gaining on us!" April shouted, looking at one of Donnie's monitors.

"Casey! Grab Donnie's seat and start shooting!" Leo ordered, and Casey did as instructed.

"Oh! Go right, go right, go right!" April shouted above everything else.

Without asking questions Leo went into the turn.

"How do you know?!" Casey asked, firing the garbage canon at Baxter again.

"I just do! Go left now, then straight!" She made sure Donnie stayed upright as Leo did another violent turn.

"Baxter's gaining on us!" She yelled, looking back to the monitor.

"Got it covered!" Casey yelled, firing another ball of garbage. He attempted to ignore when the fly-man began eating it, and instead fired another, hitting him dead on and out of the sky.

"He's down!" Casey cheered, and they drove for another minute before finally pulling over.

"Should we just leave him here?" Leo asked, hovering over Donnie. "I mean, shouldn't he have woken up by now?" He sounded horrible.

"I think he'll be safe, any bad guys who come by won't think we're in it parked, right?" Casey shrugged.

"Yeah, I guess, come on, let's go." Leo said, pulling the canister out of his shell. Thank whoever, Donnie had decided to leave it with him, or else it would probably be on the bottom of the vat of mutagen.

They shut and locked the door before making their way to the roof, April getting up surprisingly quicker; mostly due to the fact that Leo would look back every 5 seconds to make sure no one was near the vehicle.

I'll probably update on Sundays, possible some Mondays, but it'll probably be weekly.

Now, if you'll excuse me, I need to go start on the sequel.

Byyye~