It was around midafternoon. Donnie, April, and Kara were awake working on Retro-mutagen for April's dad, Master Splinter, and hopefully, Sara...well, April and Donnie were awake. Kara was sleeping in one of the chairs, snoring softly with a bit of drool sliding down the side of her mouth, rolling idly past them with a tool in hand while Donnie was adding chemicals to the mixture. "Are we done yet, Donnie? We've been up for, like, a million hours." April said softly laying against the table with her head against her arms trying to stay awake watching Kara roll away. "Sleep..but..must stay awake." She thought closing her eyes to rest but opened them once more when Donnie spoke to her.
"No, no, no, no, no worries, April. This time it's going to work." He said while turning on his Bunsen Burner. "We'll finally be able to turn your dad human again." April gave him a tired smile thinking about having her dad back.
"Now, I'm adding a sample of your DNA so brace yourself for the scientific breakthrough of the century: Retro-Mutagen!" Donnie said loudly with excitement waking Kara up with a start, jolting away. "3.1415!" She shouted, looking around in confusion. Seeing April and Donnie she breathed in deeply while stretching her arms. "Ugh, what time is it?" She asked tiredly before rolling over to April seeing she had fallen asleep. She looked down at her phone seeing it was close to two in the afternoon and groaned, "Donnie, we've been at this since yesterday morning..we need a break. Especially you." She looked up at him rubbing her eyes knowing he's been at this the longest and sighed if his mask wasn't on she'd bet she'd see dark circles under his eyes.
"Sorry, Kara..I have to do this for Kirby, Master Splinter, and your sister. I can't give up just yet" He said while squeezing a drop of the mixture into a petri dish, covering it, and placing it under the microscope. "Ok mutant cells..please turn normal. Please turn normal." He said to himself while looking through the microscope. Kara was starting to fall asleep again when his sudden outburst of excitement woke her up.
"I did it! I really did it! Wohoohooohoo! Ow!" Donnie shouted waking up April and Kara.
April stood up and stared at him in disbelief. "You did it? You really did it?!"
"Did what?" Leo asked as he, Mikey, and Raph came in.
"Invent pizza that doesn't get soggy in milk?" Mikey asked with a smile, taking a bite of his pizza.
Raph walked up to them and blinked in surprise at Kara. "Woah, heheh, you look awful." He chuckled staring at her tired face with dry drool on the side of her mouth. She glared at him before turning to Donnie.
"I finally made it! Retro-Mutagen guys! The key to turning Mister O'Neil human again as well as Kara's sister." April smiled at him her eyes filled with hope. This woke Kara up and she smiled brightly before running out the room immediately dialing Sara's number, going to the restroom to wash her face while the phone was ringing.
"Hey, sis. I got some good news I was just fixing to call you." Sara said in a light tone. From the background noise it sounded like she was in a car.
"Hold your news first, sis, I got some better news! Donnie made a cure, Retro-Mutagen! You can be human again!"
"..That is better news.." She said dumbfoundedly. "I was letting you know I have a few days off before I tour to London so I'm coming by to see you and your friends."
"Even better! I'll go tell the guys right away! I'm so excited! Bye!" She hung up the phone running back to the lab.
Sara lowered her phone from her ear staring down at it then looked over at her hand. "Driver, pick up the speed, please."
"Yes, ma'am." She heard the driver say and she turned her head out the window, a small smile showing on her face.
"I've only got enough for two doses. One for April's dad and one for either Master Splinter or Sara."
Kara stopped hearing them talk and blinked in surprise. "Only two..so it's a choice between Master Splinter and Sara?...oh no.."
"Can you make more of the stuff?" Leo asked Donnie.
"Yeah, but it takes ten canisters of mutagen to refine just one dose of retro-mutagen and I don't have any left. At least we can find your dad and change him back."
April kissed Donnie on the cheek, thanking him for it and saying how he was the best while Kara snuck out of the lab. "It's going to be Master Splinter over Sara any day...I have to find more for them. Sara can't wait any longer!" She gathered up her things, taking Donnie's mutagen tracker, an empty sack, and her usual gear before running out of the lair and climbing onto her scooter in search for mutagen. Kara was driving all over New York trying to find mutagen but she wasn't having much luck. "Grr..Donnie made it look easy..this is hopeless!" She slumped against her scooter in sorrow wondering if she'd every have her old sister back. She shakes her head, smacking herself to get rid of these thoughts and continued the search. Millions of thoughts were going through her mind at once when a memory flashed of when Mikey had acne. She slammed on her breaks, widening her eyes. "Baxter had a ton of mutagen in his old lab! I can sneak in and take what I need! This is perfect!" She did a u-turn and drove the other way towards his old lab while shouting, "I am a genius!"
Hiding her scooter behind some trash she snuck inside through the backdoor and saw the large thing of mutagen. She grinned in triumph and ran towards it. She continued grinning to herself like an idiot before looking around for something to pour it in. Rummaging through the crates she managed to find one full of empty canisters and jumped up and down. Grabbing one she walked around it trying to find a nozzle or someway to get out. "Guess I'll have to climb to the top." Looking around for somewhere to jump from she heard fluttering of wings too loud to be those of birds but more of an insect. Getting nervous she hid behind some crates just in time to see an insect/human hybrid flying through the windows with April in it's arms. "April?"
It let her down gently before telling her to stay and walked away.
"Baxter, you don't have to do this. Donnie can help you. He can make more retro-mutagen it'll only take a couple mont-I mean hours!" April said urgency in her voice. Kara's eyes widen hearing the name. "That's Baxter Stockman?! Poor guy..." She couldn't help but feel sorry for him for being turned into a hideous bug.
"And if he failzzz..I have a backup plan." He said with a twitch of his head while going towards her with rope in his arms.
"So do I." April said, narrowing her eyes while bringing out her weapon and attacking. Using his surprise to her advantage she made a break for it only to have him fly in front of her and grab her. "No ezzzcape!"
Kara watched Baxter tie April up and clenched her fist trying to wait for him to turn his back before going to rescue her. She waved her hand trying to get April's attention. When she succeeded she mouthed for her to distract Baxter while she tried to find a way to set her free.
"You go here and I prezzz the button. You fall and I..I jump in. We become apart then come together you and me azzzz one. More human than I am now." He said before digging through his pockets and pulling out a chocolate bar.
Running behind some crates out of Baxter's sight she looked around for anything to help her. Getting an idea she tried getting her attention but she was too busy staring in disgust at him devouring the chocolate. Giving her forehead a gentle smack she tried to find another way. Only one solution came to mind: beating the grossness out of him. She slipped on her gloves and grabbed at one of the empty canisters to throw at him to get his attention she stopped seeing rope fall from the ceiling and the guys plus Casey Jones sliding down.
She grinned at their timing and waved her hand to get their attention when she saw Casey Jones smack a fly..a little too loudly which brought Baxter's attention to them. "Turtlezz! Ah, yezz, tried to zzzneak in but no retro-mutagen no traade."
"I got your retro-mutagajunk right here!" Casey Jones shouted while doing an air guitar move on his hockey stick. Baxter turned his head around and spat the acidic saliva onto the rope as it began to dissolve, April inching towards the mutagen.
Watching Donnie, Leo, and Casey Jones fight Baxter she snuck closer to the mutagen. "Well, that distraction works..April, I need you to start swinging back and forth. If you get enough speed you should be able to fall away from the mutagen." She whispered up to her while trying to climb but couldn't get a good grip. April looked down at her and nodded starting to slowly swing herself. Kara walked over to some crates and began pushing them towards April but saw Donnie use a grappling hook to get to April she began to slow down only to have him knocked away. She saw the rope and grinned before grabbing onto it and climbing to the top as fast as she could, everyone blinking in surprise to see Kara here wondering how she got here so fast.
Kara heard the rope snap and when she reached the top she pushed herself upwards, flying at April and reached both her arms to grab her, the rope loosening around April as she reached her hand out to her. "I'm going to get her..I'm going to get her!" She screamed in her mind her eyes widening as their fingertips touched but it was too late. "No.."
She watched in horror as the last image she saw was April's shocked face before she was fully submerged into the mutagen. Not noticing she used too much power in her kick off she hit the tip of the top and stumbled to the ground, falling flat on her stomach, letting out a short cry in pain but immediately jumped to her feet, holding her side in pain. "No! April!" She shouted seeing her silhouette inside the mutagen. "I...I was so close.."
"To become onnne!" Baxter shouted while flying towards the mutagen. Kara clenched her fists in anger and brought out her taser setting it to full blast but just before she could get to him she heard Casey Jones shout, "Eat it, bug!" Before throwing his hockey stick at Baxter, hitting him in the face and tackled him to the ground.
Watching Leo and Donnie climb to the top she followed suit standing on the other side of them staring down into the mutagen. "Is she..." Leo dared not finish his sentence watching the air bubbles splotch and explode until a large pile of mutagen surfaced holding onto the ends. It exploded and showed April as herself, hacking up mutagen that got into her mouth. She looked over at Kara angrily. "Nice catch, Kara." She blinked in surprise seeing Kara's shocked face and watery eyes. "You're ok.." She said softly a smile appearing on her face and moved around to help her up but was stopped by Leo. "She's still covered in mutagen. It's best not to touch her just yet." He said quietly but blinked in surprise when she hugged him instead. "She's ok." She let out a relieved laugh and sniffed trying to keep herself from crying. Leo smiled softly at her and gave her a gentle squeeze. "Yeah, she's ok."
"You're immune to mutagen! That's why your DNA worked to create retro-mutagen." Donnie had a look of disbelief on his face while bringing out the retro-mutagen canister. "Amazing!"
Baxter managed to get Casey Jones off of him and flew up above them. "I'll devour you aaalll! I'll drink you like deliciouzzz filth!" He flew at them aiming for Donnie but Kara did a jump, spin kick at Baxter sending him flying backwards. She landed on her feet but fell to her knees wincing in pain while holding her side. "I feel a bruise coming.."
Donnie jumped at her side and helped her stand up. "You ok? Ah!" Donnie pushed her out of the way when Baxter flew at them but April and Casey Jones jumped on him, grabbing ahold of his wings but he continued towards Donnie managing to grab his arm trying to reach for the retro-mutagen.
Leo was trying to push Baxter backwards while Donnie kept the retro-mutagen out of reach. She slowly got up and groaned once more landing on her bad side before walking up to them and snatching the retro-mutagen out of his hand.
"I think I'll take this retro-mutagen out of your hands." She said with a grin but froze when she heard the large doors open up to Rahzaar and footbots.
"I heard you say "Retro-mutagen"? I can become human again!?"
"No! I was saying...That mutagen looks so..retro! Like a lavalamp! You know, all gooey and glowing...you're not buying this are you?..." She said while hiding it behind her back starting to take a couple steps back.
"Bring me that vile!" Rahzaar ordered the footbots all of them running right at her. She gulped before running away from them. "Gotta protect this.."
"Not zzzoo fazzt!" Baxter shouted jumping right on top of her. "Neeeed retro-mutagen!"
"Ewww! He's touching me!" She shouted while holding onto the retro-mutagen for dear life.
"Get off of her!" She heard April shout before smacking him with her weapon and fighting him off. Kara stood up but blinked when she saw her hands were empty. "Oh no."
She looked up and saw Baxter moving the needle towards his neck but Casey Jones smacked a footbot's head at him causing him to drop the vile on the ground.
"We found April's dad!" Leo shouted grabbing the vile and sheathing his sword. "Let's get out of here." He, and the others ran out the entrance door Kara moving to follow but stops hearing her phone ring. "Oh, what now." She grumbles while taking it out and answering. "Yeah?"
"I'm here." Kara heard Sara say and stopped. "Where at?" She asked glancing around the room.
"At your place."
"I'll meet you there. Don't move." She said in a serious, urgent tone before hanging up, running out the door, climbing on her scooter, and driving to her place.
Jumping off her scooter she didn't notice it drive into a pile of garbage for she was running inside and rapidly pushing the elevator button to open the doors. "Come on, Come on..."
Raph managed to kick Mr. Kirby down to the floor of a roof before he could get a taste of Mikey and both of them landed Raph holding out the blanket to set over Mr. Kirby to calm him down.
"Wait." April climbed to the roof surprising Mikey and Raph. "Let me talk to him."
She walked over to him just as he began to come to.
"Stay calm, dad. We're here to help you." She spoke softly getting down on her knees and placing her hand on his muzzle. "Just calm down." She said with a small smile.
He stared up at her as if trying to remember who she was before letting out a soft noise and nuzzling his head against her, April hugging him tight.
"Sorry this took so long, Mr. O'Neil." Donnie said while digging through his sack for the retro-mutagen. "Just a quick spray on your skin and you'll be as good as new."
Just as he brought out the vile Baxter came in and swooped it right out of his hand leaving him with his hand in the air and a shocked look on his face and flying off while talking to himself about getting it.
"Seriously? Again?!" Donnie shouted, irritated.
Hearing a sound he turned around to see footbots gliding through the air like flying squirrels.
"Flying footbots?! Dude, this is getting out of control!" Mikey said while watching them fly after Baxter.
"Let's move, turtles!" Leo shouted while running to the edge of the building and jumped off landing on a footbot. He sliced the head off and took control of it having it follow after Baxter. "Now let's get that vile back."
"Turflytle and his sidekick Maggot Boy to the rescue!" Mikey shouted following Leo's suit while Raph adjusted his flying gear before taking off. "Maggot Boy?! I'm going to make you eat that stupid costume."
"April, you and Casey stay put and keep an eye on your dad."
Finding where Baxter was first, Mikey swooped in getting the vile out of his hands while shouting, "Taste the sting of Turflytle! Buzz! Buzz!"
Raph caught the vile before it hit the ground and grinning with pride. "Nice hit Turfly, Mikey!"
Footbots surrounded Raph one of the jumping onto his back and grabbing the vile before flying off leaving him to crash to the ground.
Above it was another footbot but it was the one holding Leo. He made the footbot fly ahead and do a u-turn hanging by it's arm and sliced the footbot in two causing it to drop the vile.
Baxter flew up to catch it but was intercepted by Mr. O'Neil, April, and Casey Jones."Yes! get him dad! Knock him out of the sky!" She shouted as Mr. O'Neil snarled at him.
Donnie Spidermaned it to the vile, catching it before it could shatter but only to have a footbot cut his rope and send him flying, flailing in the sky, the footbot taking the vile as Donnie crashed into a dumpster.
Mr. O'Neil and them were chasing Baxter trying to knock him out only to have Casey Jones lost his balance and began to fall but Mr. O'Neil caught him in time and continued after Baxter, who turned around and spat his saliva at them, April blocking it with her weapon. "Ugh, gross."
"Catch up to him he's getting away!" Casey Jones shouted seeing they were way behind.
"Oh, no you don't! Get him, dad!" April shouted as they continued to pursue Baxter.
Spotting the footbot with the vile Baxter sped up and swiped the vile from it along with its arm. "At lazzt."
Seeing Mr. O'Neil and the turtles catching up to him he threw the arm at Mr. O'Neil knocking him backwards. He chuckled in satisfaction but didn't notice the sign and smacked right into it, falling over with the vile rolling towards the edge of the building.
Everyone spotted the vile and circled to get it. A small breeze blew with just enough force to unbalance the vile and have it fall over the side.
Everyone trying to get it at once they all smacked into each other til it was just Mr. O'Neil and them missing by an inch April yelled as it flew towards the lamppost but stopped seeing a shadow grab it before it made contact.
"What?!" Everyone shouted in surprise watching the shadow figure land underneath the light to show Kara with a grin on her face.
"Kara!" Everyone had a look of relief and joy on their face to see her with the vile in hand.
"I'm not alone, guys." She said as a smoke cloud formed beside her to reveal Sara.
Blowing her bangs out of the way she grinned at the turtles and gave a small salute with her index and middle finger. "Sup guys?"
Kara turned to the footbots and pointed at them. "Be careful, they can copy your fighting style."
Sara grinned as her body began to change to its smokey form. "They can't copy what they can't see." She said before flying at them.
"April! Follow me, hurry!" Kara shouted while waving the vile above her and turned around, running off.
April gripped her father's ears and kicked his side while shouting to go. Mr. O'Neil let out a startled yell before flying after her.
"Raph, go follow Kara, hurry!" Leo shouted to Raph who nodded grabbing the blanket and flying to catch up but going a different route to get ahead of her.
Kara glanced behind her seeing Mr. O'Neil was very close to her and opened the vile before ducking down and throwing it over her just as Mr. O'Neil swooped over her, the retro-mutagen hitting him in the stomach.
April and Casey Jones flew off just as Raph flew over them, throwing the blanket on Mr. O'Neil, Mr. O'Neil crashing to the ground roaring in pain.
Everyone gathered around to see if it would work, Sara being the last one to come up and saw a fat hand rip through the blanket then out popped Mr. O'Neil's human head.
Everyone shouted in victory at the success, Kara jumping while throwing her fist in the air. "It worked!"
"Dad! I can't believe it! I missed you so much!" April said with such joy she hugged her confused father.
"A-April? What happened? Where am I? And why am I...nude?" April blinked realizing he was naked underneath but Mikey managed to change the subject.
"Dude, when you hear what happened you're gonna laugh so hard!" Mikey said with a grin.
Kara thought about smacking him upside the head but decided against it for this was a special moment.
"You did it Donnie! You're the best of the best of the best!" She shouted hugging him tight and kissing him on the cheek before going over to Kara.
"Kara, what you did..was amazing! I thought I would of never gotten my dad back!" She hugged her tightly making Kara smile.
"Don't thank me, Sara was the one who flew us all the way here at the speed of light."
"I heard there was a cure for this and since I was on the way here anyways I decided to come and visit." She said nonchalantly leaning her weight to one leg and putting her hands in her pockets.
"About that.." Donnie said with a sad tone. "We don't have anymore left...the first vile was destroyed so I had to use the last one..I'm sorry."
Kara looked at him and sighed softly. "I figured you would use it for Master Splinter first so I went in search for some myself and remembered Baxter had a whole thing of it so I snuck in and went to take some but found April as a hostage and well..things escalated from there." She gave a nervous grin rubbing the back of her head.
Sara walked up to Donnie placing a hand on his shoulder. "I said before not to worry about me. I like my abilities. I'm happy you used it on your friend first. Focus on saving others that were changed by this." She gave him a reassuring grin giving his forehead and kiss and laughing at his embarrassed face.
"No fair, I want one!" Mikey shouted still in his costume making her laugh harder.
The guys dropped off April and her dad making sure no one spotted them and left when they entered their apartment then dropped Casey Jones next.
Everyone was at the lair and Sara decided to give Master Splinter a visit while the guys and Kara sat in the living room gorging themselves on pizza.
Donnie left to his room while Kara went to get drinks and blinked in surprise to see he was gone and asked Leo where he was.
"He went to his room to get something real quick." He said while watching tv.
She nodded and went to his door, gently knocking on it and opened to see him passed out halfway on his bed.
Kara looked at his sleeping form with a soft smile and moved him so he was fully on the bed and gave him a kiss on the lips. "Goodnight, Donnie...I love you." She said softly before leaving him to rest.