Turtles' Big Sister

Battle for New York: Part 1

The night was quiet, everyone sleeping soundly in their temporary home. Everyone but Mikey, who was mixing various things into a beaker in Donnie's and Samirah's makeshift lab, wearing a pair of goggles over his eyes.

He picked up the glowing blue mixture he'd created. "Hmm, I do believe this plutonium should react flawlessly with the sodium bicarbonates," he said with a British accent. "What do you think, Ice Cream Kitty?" The mutant cat, also wearing a pair of goggles, meowed. "Then perhaps we should add this hyperbole solution to Donnie's and Samirah's retro-mutagen." He grabbed the beaker of retro-mutagen.

Donnie walked into the room, rubbing the sleep from his eyes, only to notice what his little brother was doing. "Mikey? HAVE YOU LOST YOUR SHELL!?"

"Pishposh and tut-tut, my good man!"

"Samirah and I have been brewing that retro-mutagen for months!" Donnie snapped. "Oh, if you ruined it, I swear I'll--"

"Hold on, dude, I got this." Mikey started to pour his solution into the retro-mutagen, only for Donnie to grab it. They started fighting over it and ended up spilling the solution, making a drop of it fall into the retro-mutagen. The new mixture bubbled for a brief moment before going still.

"Phew."

The mixture started fizzing, yellow steam rising from it as it glowed bright gold.

"Oh. Oh no, Mikey!"

The mixture spilled over the edge of the beaker and released a blast of energy that knocked the boys and Ice Cream Kitty into the wall, Mikey holding onto the cat.

"It's gonna explode!" Donnie shouted.

The two boys clung to each other as they waited for the expected eruption, only for everything to suddenly stop as though nothing had happened.

Mikey blinked. "Aw, well, that weak."

Donnie growled, Ice Cream Kitty jumping away from the boys as Donnie tackled Mikey and they started fighting. 

"Now, you listen to me!"

"No! You listen to me!"

"I am gonna teach you such a lesson! I--!"

Sensei hit both the boys in their pressure points, making them cease the fighting. "What is going on in here?"

April ran into the room to see what the commotion was about, her gaze landing on the sparkling mixture. "Um... Since when did the retro-mutagen start doing that?"

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Once things calmed down, Donnie put the new sample under a microscope to study its effects. "Wow! Its bonding rate it phenomenal. Haha, I can't believe it! This will save me and Samirah months of lab work! Okay, let me see." He picked up the slide the mixture was on, sucking it up into a dropper. "One small drop..." He released a single drop into a vial of mutagen, watching as the entire vial turned. "And I'm able to transform an entire vial of mutagen into retro-mutagen!"

Samirah laughed. "Mikey, you're amazing!"

"I know," Mikey responded, then proceeded to hit a slice of pizza against an action figure.

"Wow, did we step into some kinda alternate dimension here?" Raph asked.

Nyx grinned from where she sat beside him on the back of the couch. "Let's test that theory." She punched him in the arm.

"Ow, hey!" Raph punched her back.

She returned the hit and a moment later, the two of them were on the floor wrestling and laughing. Pepper cleared her throat and they stopped mid-attack.