A/N: Eclipse belongs to GeekyCookie1 . Mara, Zane, and Calista belong to MariChat3 .

Enjoy!

" Okay, so, yes, Baxter does get mutated here, but technically, that wasn't our fault. The important thing here is that we were able to turn Mr. O'Neil and Miss. Walker back to normal! "

THE NEXT MORNING , the seven teens had gotten up earlier than they usually do as the five mutant turtles and Briana had wanted to see if they'd be able to help Henry learn control over his wolf side.

"Okay, what's with the heart monitor?" Henry questioned as they stepped into the dojo, noticing the small Bluetooth heart monitor in the purple masked mutant turtle's hands.

"You're gonna wear it for the rest of the day." Donatello said, handing it to him as Henry took it. Once Henry took it, he took out his T-phone and clicked on an app. "I got an app on my phone to track your heart rate."

"Should I ask why you decided to become a klepto?" Henry questioned jokingly, securing the heart monitor onto his arm and then pulling his sleeve over it.

"Well, accordingly to Daniel, your heart rate goes up when you go wolf, right?" Donatello asked and Henry nodded in response. "It also goes up when we're on patrol and have to fight or if one of us gets hurt . Daniel's trying to teach you control through anger—maybe learning to control it is tied to learning how to control your heart rate."

Michelangelo blinked with a grin. "So, Henry's like the Incredible Hulk ."

They just turned to him with blank stares. "Did you really just compare him to the Hulk right now?" Raphael questioned bluntly with a raised brow.

"Well, it happens when he gets angry."

"Yeah, but Henry wasn't exposed to a massive dose of gamma radiation during a bomb test, Mikey." Eclipse reminded.

Michelangelo shrugged. "Close though."

"Okay," Henry said, as he looked over at Donatello again. "Now what?"

Donatello then gave a sheepish smile, suddenly looking nervous as he rubbed the back of his neck. "Well, uh... that's the thing. For the next part, all I'm gonna ask is that you don't get mad and kill us."

"Great way to start, Donnie," Henry remarked sarcastically as he frowned a little.

Donatello took about ten feet from Henry and dropped a bag onto the floor in front of him. He then opened the heart rate app on his T-phone. "We're gonna hit you with baseballs and you just have to not get angry, that's all."

Henry blinked at those words. "I have a bad feeling about this."

"No kidding," Leonardo agreed. "Uh, Donnie? Is this really the best idea?"

"I'm positive." Donatello reassured them.

"How positive?" Briana questioned.

Donatello took a while to think about it. "Uh... fifty-fifty."

"Fifty-fifty," Eclipse repeated as she stared at him. "That's not as reassuring as you think it is."

Henry sighs as he turns his head towards the others. "I'm just gonna apologize in advance now... so, just in case, I'm sorry."

"Everything's gonna work out fine." Donatello said. "If anything, it's better than what Daniel did."

"Daniel's 'genius' plan was to beat him till he gained control," Raphael said with an eye roll. "This is the same thing, just with baseballs."

"Look, if you're not up to this, we can figure something else out." Leonardo said, looking over at the teenaged boy.

Henry remained silent for a while before he gave a small sigh. "I have to start somewhere, let's give this a try."

And so, while the others made their way over to Donatello, Henry just took a deep breath and the others waited for him to get ready. Once he was ready and nodded at them, one baseball at a time was thrown at him hard. They gave him five seconds in between each ball to recover before throwing another one at him. He couldn't help but groaned in pain when one hit him particularly hard in his collar bone.

"Okay, that one hurt for sure," Henry said through gritted teeth, trying to keep himself calm.

"Hey, no—no talking," Donatello reminded. "You should be thinking about your heart rate and keeping calm, okay?"

Henry did the best he could to give himself an inner pep talk as baseballs were still thrown at him, and the others continued to give five seconds to rest in between still. Henry felt his heart rate slowly begin to rise again as each ball seemed to hurt more than the one before.

Henry then gave a loud groan of annoyance. " Damn it! " He cursed through gritted teeth. "This is the worst!"

"I'm not gonna lie, but I think my aim's improving." Michelangelo said with a grin at the thought of his aim.

The others just stared at him with unamused expressions on their faces while Henry groaned in pain. "Not helping!" He said through gritted teeth again.

Donatello glanced down at his T-phone at the beeping sound. "Hey, no getting angry."

Henry couldn't help but roll his eyes at those words as the process of getting hit with baseballs began again. Each ball seemed to be a trigger—a trigger that was closer to detonating the angry wolf inside of him. He bit the bottom half of his lip and did his best to reign it back in as best as he could, but no matter what, Henry could still feel his wolf thrashing around inside of him, wanting nothing more to break free.

But then, the last shot got Henry right below and it had Henry dropping to his knees, pressing his forehead against the cold floor as he hoped that the coldness would shock him into not losing control. He felt his claws started to replace his fingernails as he dug them into the floor. Not knowing what he'd do if he lost control, he squeezed his eyes shut and tried to concentrate on something— anything else, really.

At the sound of beeping, Donatello glanced down at his T-phone and saw that Henry's heart rate was at 158 ​​​​before quickly changing to 160 then changing to 161 and it was only rising faster as the beeping grew rapidly. He held out his T- phone to the others and showed them.

"Henry?"

Henry didn't answer as he kept his forehead against the cold floor while his claws continued to dig into the floor. He kept his eyes squeezed shut tightly as he let his mind wander, trying to think of anything that would calm him down.

'Come on, Henry. Think of something—anything! You can't lose control—you can't risk it!' He thought secretly to himself. 'Uh... think about... family? Your parents?' He groaned as he felt his heart rate rising faster and he swore that the rapid beeping sound that was the heart monitor app on Donatello's T-phone wasn't helping. 'Okay, no! Not your parents! But something else! '

The five mutant turtles and Briana then cautiously moved towards Henry as Eclipse softly called his name. The six of them knew that Henry wouldn't want them getting too close just in case he started to change. But as Eclipse softly called his name and the others did the same as well, Henry could've swore that it felt like a switch went off in his head and he could feel himself slowly starting to calm down. He kept his eyes closed, letting himself focus on their voices as the aggressive beeping from Donatello's T-phone slowly began to quiet down along with his heart rate.

"Hey, Hen," Eclipse said, lightly touching his shoulders. "Are you okay? You started to change."

"From anger, but it was more than that," Henry panted, before rolling onto his back to catch his breath. "It was like, the angrier I got, the stronger I felt."

"So, it is anger, then," Briana noted. "Daniel was right then."

"I'm so screwed." Henry spoke up, a small frown coming onto his face as he started to realize something.

"Hen, we can figure something else out," Leonardo tried to reassure him.

"Yeah, bro, there's gotta be something that can help you—or that we can do to help." Michelangelo added.

Henry shook his head. "That's not what I meant," he admitted and he swore that it felt like his heart had sunk. "I don't know if I can be around you guys."

"What? Why?"

"Because I don't want to end up hurting one of you guys—" Henry responded. " I can't ."

"Henry, everything's gonna be fine," Donatello said. "We'll figure it out, together ."

"Yeah, dude," Raphael added. "Besides, there's our team rule, remember? Family first, always and forever."

Henry let their words sink in as he nodded, wanting nothing more for them to be right. The last thing he wanted to do was for one of them to get hurt and have it be his fault.

👑👑👑

"ALMOST GOT IT." Donatello said quietly, carefully pouring liquid into a jar. Later on during the day, he and Briana were working on perfecting the retro-mutagen as the seven teens decided to take a break from training. Both April and Kaz were with them, sitting at the desk—April had her head on her arms while Kaz was leaning back in his seat. "Almost got it."

April yawned. "Maybe we should call it a night, guys. We've been up for a long while now."

Kaz couldn't help but yawned as well. "Or maybe we should take a break."

"Oh, no, no—no worries, guys. This time, it's gonna work," Briana said as she turned on the heat under the jar. "We'll finally be able to turn your dad and your mom human again."

"Now, I'm adding a sample of your DNA so, brace yourselves for the scientific breakthrough of the century! Retro-mutagen!" Donatello said while Briana watched the mixture excitedly. Both April and Kaz, however, had ended up falling asleep . Donatello then placed a drop of the finalized mixture onto the microscope slide and placed it under the microscope to examine. "Okay, mutant cells. Please turn normal. Please turn normal." The mutant cells shook for a moment and then stopped. " Oh." They suddenly disappeared, leaving normal human cells as he then gasped. "Eureka! We did it! We really did it!"

Briana felt her eyes widened. "We did!? Let me see!" She looked through the microscope and looked away, beaming. "We did it! We actually did it!" She and Donatello shared a high-five.

Both April and Kaz, who heard the commotion, woke up at their cheers and lifted their heads to look at them. "You guys did it? Y—you really did it?"

"Did what?" Leonardo asked, stepping into the lab alongside the others.

"Invent pizza that doesn't get soggy in milk?" Michelangelo asked, eating a slice of pizza as he entered the lab.

"We finally made it!" Donatello said excitedly. "Retro-mutagen, you guys! The key to turning Mr. O'Neil and Miss. Walker human again!" He picked up the jar as Splinter walked into the room. "And you too, sensei."

"Human once more?" Splinter asked. "Save April's father and Kaz's mother first. And then, I will consider it." He walked out of the lab, the others staring after him.

Michelangelo ran by Donatello and Briana, taking the jar. "Ooh, what if I turned myself human again? I wonder what I'd look like."

"We were never human to begin with, genius," Eclipse retorted. "We'd just turn back into turtles."

"Give me that," Donatello took the retro-mutagen from his brother. "We've only got enough for three doses: one for April's dad, one for Kaz's mom, and one for Master Splinter."

"Can you make more of this stuff?" Henry questioned.

"Yeah, but it takes ten canisters of mutagen to refine one tiny dose of retro-mutagen, and we don't have any left," Briana explained.

Donatello then turned to their two friends as he added. "But at least we can find your dad and your mom and change them back."

"I—I just... I'm speechless! Thank you. Thank you, so much, guys! You're the best!" April pulled the turtle down to her and kissed his cheek.

Once she released him and left the lab, Donatello started to babble a bit before passing out on the desk from happiness. Then, Kaz turned towards Briana with a soft smile—one that already had her heart racing, fluttering, and pounding in her chest all at once.

"Thank you, Love. You're amazing." Then, Kaz winked at her but not before he leaned in and kissed her cheek, causing her cheeks to turn bright red as she blushed while her legs suddenly grew wobbly.

Once Kaz had left the room, Briana couldn't help but stood there with a bright red face as she began to giggle uncontrollably with a wide grin on her face. Then, her legs gave in as she fell backwards, staring up with a huge smile on her face.

👑👑👑

A FAMILIAR MUTANT bird landed on a rooftop, dropping a stick on the nest that the mutant had made on the rooftop before getting settled on it, its eyes closing as the mutant bird had drifted to sleep. Unaware to the mutant bird was that Boy Danger , Eclipse, Kaz, and Captain Violet, who had the retro-mutagen in her satchel, were watching from a nearby rooftop. Leading the way, Boy Danger, Eclipse, Captain Violet, and Kaz used their grappling hooks to get across.

As Boy Danger gives the cue to move in, the three teens silently approached the mutant bird, Captain Violet pulled out a syringe of retro-mutagen and moved to spray the mutant bird. But as she aimed the syringe of retro-mutagen at the mutant , a loud yet familiar scream is heard out of nowhere that startles Captain Violet, causing her to drop the syringe onto the ground. The sudden scream had startled Emma awoke, and the mutant bird quickly took flight.

"Mom, no!"

"Uh, was it me or did that scream sound like April?" Eclipse questioned.

"It definitely did," Boy Danger answered just as his T-Phone started ringing. He reached into his belt and took it out. "It's Leo." He answered the call and held the phone up to his ear. "Leo, what's going on?"

"We have a problem. There's another mutant and he has April."

"He?" Boy Danger questioned. "You know who it is?"

"Yeah... the guys and I are heading back to the lair. I'll explain what happen there."

"Alright, we'll meet you guys back at the lair then."

👑👑👑

ONCE THE GROUP had arrived back at the lair, the blue masked mutant turtle had explained to them what happened when they were trying to turn Kirby back to human. After hearing what happened, both Boy Danger and Leonardo had decided to split up into two teams --one led by Leonardo and the other led by Boy Danger as the two had called Casey, Zane, Mara, and Calista for extra backup as well.

"Alright, who's the soon-to-be-slap-shotted goon that kidnapped April?" Casey asked as he, Zane, Mara, and Calista stepped into the lair.

Leonardo sheathed his katanas as he and Henry had been going through some katas. "Long story, Casey. We need your help big-time."

"And yes, you'll get to hit someone with a hockey stick, and yes, you'll get some action too," Henry added before Casey and Mara could even ask. "Probably more than once."

"Heh. Yes!"

"Alright, let's do this then!" Mara said with a chuckle.

Calista, on the other hand, didn't see how they had to help out with something that was caused by them. Why should she care if it was their fault for letting it happen in the first place? After all, she hadn't been the one that turned April's father into a mutant bat or Kaz's mom into a mutant bird.

"So, the four of us and Henry are going bat-wrangling and bird-wrangling tonight." Eclipse stated as she and Raphael walked over to where Michelangelo and Briana were.

Briana felt her skin paled when she realized something. "Wait, you don't mean..."

Michelangelo, on the other hand, smirked. "Aw, yeah! You know what that means, right?"

"Please don't." Raphael said.

Briana immediately shook her head. She really didn't want to put the costume on, especially not in front of her friends or Kaz. "No, no, no, please don't."

But Michelangelo had threw down a smoke bomb and once the smoke had cleared, he was wearing his turflytle costume, but he was the only one that appeared. "The return of turflytle, dog!"

"Where's B?" Mara asked as she walked over to them.

Michelangelo then realized that his youngest sister hadn't appeared with him. "I'll get her!" He threw down another smoke bomb and this time, once the smoke cleared, Briana was there wearing the worm costume.

"Why are you guys doing this to me?" Briana asked, trying to hide her face with her purple hair.

"Oh don't worry," Eclipse said, a small smirk on her face as she pushed her sister's hair out from her face. "You look fine."

"You know, if you're worried about what your little boyfriend would think, I wouldn't worry," Mara teased her best friend, though a few chuckles left her lips. "I bet he'd find it cute."

Briana felt the color drained from her face, realizing where this was going. "You wouldn't."

But Mara just smirked at her and Briana could see her brothers and sister grinning at her too.

"Hey, Kaz!" Mara called out towards her friend, a smirk on her face. "What do you think of her costume? It's cute, right?"

Kaz looked over at Briana to see her costume and with a smirk, he winked at her. "Yeah, I think it's cute."

Immediately, Briana felt her face turn bright red as she blushed before she tried to use her hair to hide her face while she could hear the others teasing her.

👑👑👑

"YOU GO HERE, and I press-ss a button. You fall! And II jump in. We cc-come apart and then we come together. You, me, as one. More human than I am now."

"Baxter, listen to me," April tried. "Dropping us into a vat of ooze isn't going to save you. You got to trust me on that."

"No!" The fly snapped. "This is--only way. Only way! Stockman-fly cc-cannot trust anyone."

Leonardo motioned to Donatello, Kaz, Casey, Mara, Zane, and Calista to follow as they entered the building silently. However, Casey got distracted by a fly buzzing around him and as he killed it, the sound of his hands slapping against the fly informed Stockman-fly of their presence.

"Nice going, Jones." Calista said sarcastically, rolling her eyes at the teenaged boy in the progress.

"Mutants! Humans! You tried, yes-s-s. Tried to sneak in. No retro-mutagen, no trade."

"I got your retro-mutajunk right here!" Casey retorted. 

Stockman-fly spit acid on the rope suspending April above the vat, and the acid was slowly burning through the rope. Then, the fight began as everyone ran at Stockman-fly while Donatello broke away from the fight and headed towards the vat to free April.

"Baxter, stop. Let us help you," Leonardo said, dodging acid blasts. "We don't want to hurt you."

Mara raised an eyebrow at those words. "We don't? Did I miss a meeting?" She questioned as Casey hurled a container at the mutant fly, missing and hitting the mutagen vat instead.

"Well, Casey and Mara do." Leonardo corrected.

"Um, guys? A little help here?" April called, panicked as the rope was starting to break even more because of the acid. 

As Donatello bolted for the tank and grabbed the rope attached to the vat, he swung his way up to the top, landing on the rim. "Not fast enough," the fly stated.

The rope snapped, sending April toward the mutagen. Donatello jumped, reaching out a hand to grab the red-head as April managed to free one arm, holding it out to her. Their fingers brushed, but neither could get a grip on the other's hand, and April tumbled into the mutagen. Donatello landed on the opposite rim of the vat.

"These freaks can't even pull off a simple rescue mission without something happening because of them." Calista muttered underneath her breath.

"Two becomes one!" Stockman-fly dove for the vat.

"Eat it, bug!" Casey threw a hockey stick at the fly's head, stunning him, then tackled him to the floor.

Leonardo climbed up to the vat as he stood next to his brother, looking into it. "Is she--?"

April then emerged from the mutagen, completely unchanged and coughing. "Blegh, nice catch, Donnie."

"April!" Donatello gasped. "You're okay! But how did--? You're immune to mutagen! That's why your DNA worked to create retro-mutagen. Amazing."

Stockman-fly flew over. "I'll devour you all! I'll drink you like blobs of delicious filth!"

"Uh, gross?" Calista mumbled to herself, sending a disgusted look at the mutant fly.

The fly attacked, grabbing Donatello's wrist and trying to get the retro-mutagen he carried. Leonardo stood between them, pushing the fly back while Kaz, Casey, April, Mara, Zane, and Calista pulled the fly away from the purple masked mutant turtle. Leonardo's phone rang, and he answered quickly.

"Got them on the run, Leo! Get over here before Raph lets Mr. O'Neil eat Mikey." Boy Danger said from the other side of the call.

"No problem, we're on our way," Leonardo said.

"Get your claws off of me!" Donatello snapped.

Suddenly, the wall exploded, which made all of the fighting come to an immediate halt as they all looked over to see Razar walking in. "I heard you say retro-mutagen. I can become human again?"

"On second thought, we might be a little late."

👑👑👑

"GUYS! KIRBY-BAT wants to suck my turtle blood! Help!" Michelangelo shouted, dodging the mutant bat.

"Maybe I'll give him just a little taste." Raphael responded.

"Raph!"

"I'm kidding, I'm kidding."

"This is the worst!" Briana said, dodging the mutant bird.

"You sure about that? I mean, this is gonna be one heck of a story for you and Kaz to tell your kids in the future." Eclipse said jokingly.

"Clips!"

"I'm kidding."

From above, Boy Danger was waiting for his chance to knock the two mutants out of the sky and onto a rooftop. Right when the two mutants passed by him, he slammed into the two mutants, knocking the bat and the bird onto a nearby roof. He landed beside the mutant bat as the four other teens landed behind him. The four of them each took one end of a tarp and approached the two mutants.

"Wait!"

They look over to see April climbing onto the rooftop. "Let me talk to him." The redhead walked up to her father. "Stay calm, dad." She knelt before him. "We're here to help you. Just calm down. Calm."

"Sorry this took so long, Mr. O'Neil, Miss Walker," Donatello said to the two mutants while Captain Violet reached into her satchel. "Just a quick spray to your skin and you two will be good as new." But as Donatello and Briana pulled out their own vial of retro-mutagen, the two froze when both vials got taken from their hands.

"Seriously!?" Donatello snapped.

"Again?" Captain Violet groaned in annoyance, watching as Stockman-fly buzz around with the vials.

Then, Foot Bots jumped over the teens, flying now as they went after Stockman-fly. "Flying Foot Bots?" Michelangelo asked. "Dude, this is getting out of hand."

"Geez, those guys will do anything to get that retro-mutagen." Zane stated.

"Let's move, guys," Leonardo ordered, jumping onto a bot and taking control of it. "Now, let's get that vial back."

"Turflytle and his sidekick, maggot boy to the rescue!" Michelangelo shouted, going after the bots.

"Maggot boy!?" Raphael snapped, following him as Boy Danger, Briana, and Eclipse had gone after the mutant fly as well. "I'm gonna make you eat that stupid costume."

"April, Kaz, you guys and Casey, Mara, Zane, and Calista stay put and keep an eye on your dad and your mom." Donatello said as he then took out his grappling hook and went to join his brothers and sisters.

👑👑👑

THE MUTANT FLY had perched himself on the side of a building, attempting and failing to open the vials. "Stupid child-proof cap."

"Taste the sting of turflytle!" Michelangelo shouted, hitting the fly with shurikens and making him drop the vials. "Buzz buzz!" Raphael swept under the fly, catching the vials and pulling up.

"Nice hit, turfly--er, Mikey." Raphael said.

A Foot Bot had then slammed into him, taking the vials. Leonardo, still in control of his bot, flew toward the bot, swinging down to slice it in half with his sword. The Foot Bot slammed into a fire escape and the two vials went flying. Stockman-fly almost caught it, but was knocked away by April, Casey, Mara, Zane, and Calista riding Kirby while Kaz was able to use his own flying ability to help out. 

Donatello managed to catch the vials. "Got it!" A bot cut the rope of his grappling hook, making him fall. He threw the vials to Eclipse, who caught it. 

Boy Danger flew down and grabbed Donatello's wrist, stopping him from falling. "You okay?"

He nodded. "Yeah. Thanks, bro."

Everyone quickly lost track of time or what was happening as the two vials of retro-mutagen were being tossed around in between all of the chaos--from the Foot Bots to the ninjas, to Stockman-fly to the ninjas, over and over again. Eventually, the two vials ended up falling into a light post and shattering, much to the ninjas' horror but with just the slightest of luck, the mutant bat and the mutant bird managed to get the last few drops of the retro-mutagen. The five mutant turtles, Boy Danger, and Briana put the tarp up in front of them, the bat and the bird flying into it and crashing into a wall. Casey, April, Mara, Zane, Calista, and Kaz emerged from under the tarp, backing away from it and soon, Kirby's head and Emma's head poked through the hole, back to normal.

"Alright!"

"Yes!"

"Woohoo!"

"It worked!"

"Mr. O'Neil and Miss Walker are back!"

"Dad!" April ran over to him while Kaz didn't hesitate to run over to his mother. "I can't believe it." She hugged him. "I missed you so much!"

"A-April? What happened?" Kirby asked. "Where am I? And why am I nude?"

"Dude, when you hear what happened, you are gonna laugh so hard!" Michelangelo responded.

"You did it, Donnie!" April cheered. "You're the best of the best of the best!" She jumped up and gave him another kiss on the cheek.

"Two kisses in one day." Donatello said dreamily. He turned to Casey with a grin. "Eat it, Casey Jones. Eat it!" He laughed. "Bow chick-a bow bow!" 

"Are you gonna do it or should I?" Mara questioned curiously.

"I got it." Casey then tripped the turtle with his hockey stick, making him fall to the pavement. "Heh."

Kaz then walked over to Briana with a smile on his face. "I know I said this earlier, but... thanks again, Love. You're the best." Then, he leaned and pressed a kiss against her cheek, causing Briana's cheeks to turn bright red as she blushed. 

"Aw, somebody's in love." Mara said teasingly as she poked her best friend's cheek. "You're blushing."

Unable to said anything, Briana just stood there with red cheeks and a wide grin on her face as uncontrollably giggles suddenly left her lips.

"Oh, grow up, would you?" Calista mumbled underneath her breath. "It's not like you two would ever get together."

Boy Danger felt his ears twitched at those words and he couldn't help but frown slightly as he narrowed his eyes at her, taking a deep breath to keep from saying something in front of everybody. Letting it aside for the moment, he turned to the blue masked mutant turtle. "Anything?" He asked.

"Nope, no sign of Stockman-fly," Leonardo answered, scanning the sky. "Add him to the list of stray, mutated bad guy freaks running around New York."

"Stockman-fly is turflytle's ultimate superhero enemy, buzz buzz," Michelangelo stated, earning an eye roll from Leonardo. "But if he's out there, buzz buzz, I'll find him, buzz bu--"

"Enough with the buzz buzz!" Raphael interrupted.

Michelangelo sighed, before he suddenly grinned.

"Mikey, don't." Eclipse warned. "Don't do it."

Michelangelo took off his antennae headband, placing it on his brother's head. "Buzz buzz, dog." He took off running and Raphael chased him.

👑👑👑

ONCE THEY HAD gotten back to the lair, the seven teens gathered in the dojo with Splinter. 

"We're sorry, Master Splinter. We wanted to change you back. But we swear, if it's the last thing we do, we'll--"

Splinter interrupted them by placing a hand on Donatello's shoulder and the other on Briana's shoulder. "Do not fret, my son and daughter. I am content with what I have become. I have no place in the human world, anymore. This is my home, and you all are my family."

"So, Mr. O'Neil and Miss Walker are back to being human again, yay! Well... at least for now, they are."