Beneath the buzzing streets of New York City—under the weight of honking taxis, towering skyscrapers, and never-ending footsteps—there was another world. A hidden one. Peaceful. Quiet. Alive.

Far below, deep within the sewers, a lair pulsed with quiet energy. It resembled a strange blend of dojo and family home, complete with a giant tree rising from the center like an ancient guardian of discipline and peace. But this was no ordinary home, and this was no ordinary family.

Six mutants moved like shadows across the dojo floor, each masked, armed, and focused in their own way.

At one end, the eldest son—serious, and sharp-eyed—moved with practiced grace. His blue mask flowed with every step as he sparred with the youngest brother, a blur of orange and endless energy.

"Yah!" Leo shouted, slicing the air with a clean strike of his twin katanas.

"Oh yeah!" Mikey whooped, twirling his nunchucks like a tornado. "Michelangelo is on the move!"

Leo braced as Mikey bounded toward him, bouncing off the walls and skidding dramatically across the floor.

"You don't know what to do! I'm here, I'm there, I could be anywhere!" Mikey shouted, hopping around with chaotic flair. "How do you stop what you can't even see?"

A silver flash—and Leo's sword hilt struck Mikey clean in the stomach.

"Like that?" Leo asked coolly.

Mikey wheezed and rolled onto his shell, groaning. "Good one, Leo..." he managed, raising a single finger in mock surrender.

Across the room, Donatello squared off against Raphael. Tall and clever, Donnie held his bo staff in a calm, ready stance. Raph—shorter but broader—cracked his neck, sais gleaming in his fists.

"All right, Donnie," Raph said. "Put down the staff and no one gets hurt."

Donnie raised a brow. "You said that last time, and then you hurt me."

"Yeah," Raph shrugged. "But less than I would've."

Donnie sighed, adjusting his grip. "Yeah, right."

They clashed.

Bo against sai, the strikes were swift—measured on Donnie's end, aggressive on Raph's. With a spin and twist, Raph hooked Donnie's staff and snapped it in half.

Donnie froze. "Should've dropped the staff?"

"Should've dropped the staff," Raph echoed, smug, before whacking Donnie across the shell with the broken halves.

"Okay, okay! Ow! I'm down!" Donnie stumbled back and flopped beside Mikey, who grinned and stuck out his tongue.

Yuki and Ariel faced off.

Yuki stood tall, black mask still and unreadable, twin tantos in her hands with perfect form. Across from her, Ariel bounced restlessly in her white mask, swinging her meteor hammer in fast, unpredictable arcs.

"You're telegraphing every move," Yuki said flatly.

"I'm just getting warmed up," Ariel shot back, swinging wide.

Yuki ducked, rolled, and came up inside Ariel's reach. The blades flashed—blunt for sparring, but fast enough to leave a mark.

Ariel shrieked as she stumbled backward, trying to recover her weapon, but Yuki didn't give her the chance. A clean sweep knocked Ariel off her feet, and in seconds, both blades were crossed at her throat.

Ariel blinked up at her, panting.

"Yield," Yuki said simply.

Ariel let out a defeated groan. "Ugh... fine. I yield!"

Yuki turned away without gloating, already sheathing her blades and returning to her stance as Ariel picked herself up and grumbled under her breath.

"Stupid fancy footwork..." She walked over and sat between Mikey and Donnie.

On the mat, the remaining two brothers faced off again. The others sat along the side of the dojo, watching closely as Leo and Raph stepped into the center.

Leo dropped to one knee, offering a respectful bow. "Onegai shimasu."

Raph rolled his eyes, already spinning his sais. "Whatever you say."

They clashed.

Twin katanas against twin sais. Metal rang out in the open space as Leo and Raph moved like lightning—controlled, powerful, and completely in sync with their weapons. Raph fought with raw force and aggression, while Leo countered with discipline and strategy.

One of Raph's sais flew from his grip mid-spin, clattering to the ground between Mikey and Donnie.

"Whoa!" Mikey yelped, diving aside.

"Careful!" Donnie snapped, scooting back.

Leo didn't hesitate. He lunged in—fast, precise.

But Raph was faster.

He dodged, grabbed Leo's arm mid-strike, and used his remaining sai to hook Leo's weapon. With a hard twist, he wrenched Leo off balance and slammed him to the mat.

"Nice try," Raph said smugly, breathing hard.

Leo groaned, flipping onto his back with a frustrated grunt.

Before Raph could fully bask in the win, a shadow stepped out from the sidelines.

Yuki.

Her arms were crossed, black mask still unreadable. Her voice cut through the silence.

"Winner fights me."

Raph rolled his shoulders, still high off his victory. "You sure about this?" he asked, spinning his remaining sai. "I just took down Leo."

Yuki didn't flinch. She stepped forward in silence, twin tantos already drawn, her stance sharp and deliberate.

"I'm not Leo," she said coldly.

The tension in the room shifted instantly. Donnie and Mikey exchanged glances. Ariel, sitting on the floor with her knees hugged to her chest, silently mouthed, "Uh oh."

Raph grinned. "Good. I was getting bored."

Without warning, Yuki lunged.

She was fast. Too fast.

Her blades came in low and clean, one slicing toward Raph's side while the other curved upward toward his neck. He barely deflected them with his sai, stumbling back a step.

Raph growled and swung hard. Yuki ducked, spinning behind him with brutal efficiency. Her tanto caught the edge of his shell—not enough to hurt, but enough to let him know she could've ended it there.

Raph snarled. "You gonna fight, or just dance around?"

"I don't need to fight someone who leaves himself wide open," Yuki snapped, parrying his next strike and twisting around him again.

She moved like a shadow—silent, deadly, focused. Every motion was clean and purposeful. Raph fought like a storm, unpredictable and violent. Their styles collided with sparks and fury.

Raph feinted, then shoved forward with a shoulder-check, managing to knock her off balance. "Still think you got this?"

Yuki dropped to one knee—then used it.

She launched upward with a sweeping kick, knocking him back and sending his sai clattering across the floor. Before he could recover, both of her blades were at his throat.

"Yield," she said calmly.

Raph stared up at her, breathing hard. He growled under his breath—but didn't move.

"...Fine," he muttered. "I yield."

Yuki stepped back, sliding her blades into their sheathes without a word.

From the side, Mikey whispered to Donnie, "She's scary when she wins."

"She's scary when she loses," Donnie whispered back.

Leo stood, brushing off his plastron. "Nice work," he offered.

Yuki didn't even look at him. She simply returned to the edge of the mat, arms crossed again, the tension still rolling off her like heat.

Ariel clapped softly, beaming despite herself. "That was so cool."

"Yame."

The firm, calm voice brought everything to a halt.

From the shadows, their master stepped into the dojo—a tall, robed figure whose very presence silenced the chaos in an instant.

Splinter.

The six siblings knelt immediately, lining up in seiza across the mat. Weapons sheathed. Breathing steady. Even Yuki, fresh off her victory, sat with disciplined poise—silent and unmoved.

"You all did very well," Splinter said, surveying them calmly.

Raph smirked, trying to recover a shred of pride. "But I did better."

There was a pause.

Donnie raised an eyebrow. Mikey snorted. Ariel whispered under her breath, "You didn't, though..."

Yuki didn't even blink.

"This is about self-improvement, Raphael," Splinter replied. "Not winning and losing."

"I know, Sensei," Raph said, throwing up his hands. "But I almost won. Which is, like... pretty good. Considering."

Splinter's eyes narrowed.

He stepped forward and calmly pressed a single finger to Raph's neck.

"Ah—ah—ow!" Raph yelped, pulling away. "What I meant to say is—we all did great. Yuki especially. Amazing job. Yay, teamwork. Ow!"

Splinter gave a rare, quiet chuckle.

Mikey leaned toward Ariel. "That's the sound of Raph pretending not to be salty."

"I don't think he's pretending," Ariel whispered back.

Leo gave Yuki a side glance—trying to catch her eye, offer a nod—but she didn't return it. She stayed focused ahead, like the match hadn't even happened.

Still, the dojo felt steady again. Focused. United.

At least... for now.

After training, the lair buzzed with a different kind of energy—the comforting sizzle of something questionably edible bubbling in the kitchen.

Michelangelo stood proudly at the stove, stirring a green, lumpy concoction that defied both science and sanity.

"There's a little more algae and worms left if anyone wants it!" he called out, waving the spoon like a victory flag. "Anybody? Anybody?"

Donatello took one look and stepped back with a polite grimace. "No thanks."

"I'm good," Raph muttered.

"All yours," Leo said flatly, not even glancing up.

Ariel peeked over Mikey's shoulder. "Is it supposed to bubble like that... on its own?"

"Technically, no," Donnie said.

Mikey sighed dramatically. "Well, I guess no one left room for... cake!"

With a flourish, he yanked a covered tray from behind his shell, revealing a lopsided, slimy blob that looked like dessert's evil cousin. Everyone stared.

"Whoa!" they all echoed.

"It is a cake," Donnie marveled, eyes wide with equal parts horror and awe.

Raph squinted. "Made of... algae... and worms."

Ariel leaned in with unearned confidence. "I'll try it."

Yuki grabbed her by the scuff of her neck and tugged her back without breaking her poker face. "No, you won't."

"What's the frosting made out of?" Leo asked warily.

"You don't wanna know," Mikey said with a grin. "Happy Mutation Day!"

All six raised their fists.

"Happy Mutation Day!"

From the dojo's shadowy entryway, Splinter stepped into view, his expression softer than usual.

"Ah, yes," he said quietly. "Fifteen years ago today, our lives changed forever... and we became the unlikeliest of families."

"Tell us the story, Master Splinter!" Mikey begged, bouncing on his toes.

"I have told it many times, Michelangelo," Splinter said, though there was no real protest in his voice.

"Pleeeeease?" Mikey whined.

Raph groaned and slapped a hand over Mikey's mouth. "Please. It's the only way to shut him up."

Ariel gave a little giggle. "It really is."

Splinter chuckled. "Very well..."

A young man walked through the streets of New York, a cardboard box cradled in his arms. Nestled inside, swaddled in a soft towel, were four tiny baby turtles. One of them let out a sleepy little chirp.

Beside the box, strapped snugly into a car seat with a blanket pulled to her chin, was a one-year-old baby girl—his daughter, Yuki. Curled up tightly against her in the seat was a baby ferret, fast asleep with its nose tucked under Yuki's arm.

Hamato Yoshi had come to America to start over. What he found instead... was fate.

He stepped out of a small pet store and into the cold city night, the weight of grief and survival pressed into every step. His wife was gone. His other daughter, Miwa—gone.

All he had now was Yuki... and these quiet, wriggling creatures. Somehow, they were enough.

But as he turned the corner, his eyes caught a flash of something strange—two men speaking in hushed tones. One held a glowing green canister, its contents pulsing like liquid lightning.

Something about them felt wrong.

Yoshi slowed his steps. Adjusted the box. His instincts sharpened. He took one cautious step forward—

Squeak!

He froze. Looked down.

His foot had landed on the tail of a rat.

The creature scrambled away with a high-pitched squeal.

The men turned. Their eyes locked on Yoshi, cold and unblinking.

"You have seen us in this place," one of them said in a clipped, robotic tone. "And this is not a place that will be left by you."

Yoshi didn't hesitate.

He shoved the box behind him, shielding Yuki and the baby ferret with his body as he launched into motion. His movements were sharp, disciplined. In seconds, the men were on the ground, groaning.

But then—it happened.

The canister slipped.

It hit the pavement.

Crack.

Green light exploded.

Glowing ooze sprayed in every direction, soaking the box of turtles. It splashed across Yuki's car seat. The ferret stirred, blinked... then squeaked in alarm.

Yoshi stumbled backward, his hands drenched in the strange fluid. His skin tingled. His vision blurred.

The world twisted.

The baby turtles began to squirm and stretch, their tiny limbs lengthening. Yuki let out a confused cry as her body pulsed with unfamiliar energy. The ferret screeched, writhing in the seat beside her.

Yoshi fell to his knees, gasping—his body warping, shifting. The reflection in a nearby puddle was no longer human.

That was the night everything changed.

The night they were born again.

"That," Splinter finished, holding up a piece of the broken canister, "was the beginning of our life together. The mysterious substance in this canister, in a way, gave birth to us all."

The six siblings sat scattered around him, the dojo quieter now, the weight of the memory hanging in the air.

Mikey leaned forward and took the broken cylinder with reverence, cradling it like a sacred relic.

"Mom," he whispered, hugging it tightly.

Ariel tilted her head. "You're not actually gonna sleep with that, right?"

"I might," Mikey sniffed dramatically.

Leo leaned forward. "Sensei... now that we're older, I think we're finally ready to go up to the surface. Don't you?"

Splinter's gaze swept over all six of them, lingering a moment longer on Yuki. She didn't say a word, arms folded, expression unreadable.

"Yes... and no," he said finally.

"Oh, man, come on," Mikey groaned.

"Lame," Leo muttered.

"I hate when he does that," Raph said, crossing his arms.

"You have grown powerful," Splinter said. "But you are still young. You lack the maturity to use your skills wisely."

"So... isn't that just no?" Donnie asked, puzzled.

"Yes... and no," Splinter replied again. "Wisdom comes from experience. And experience comes from making mistakes."

Donnie brightened. "Aha! So in order to gain wisdom, we have to make the mistakes. So... we can go?"

"No."

"...And yes?"

"No!"

Donnie slumped. "Oh..."

Leo stepped forward again. "Sensei, we know you're trying to protect us. But we can't spend our whole lives hiding down here."

The brothers all looked to him—united, hopeful.

Ariel scooted closer with wide, pleading eyes.

Even Yuki didn't look away. Her expression stayed guarded, but... she didn't object.

Splinter let out a long, thoughtful sigh.

"...You may go tonight."

"High three!" Mikey yelled, slapping hands with Donnie and Ariel.

"Let's gooo!" Ariel cheered, throwing her fists up.

Raph gave a satisfied smirk. Leo allowed himself a rare, proud grin.

Yuki simply stood, grabbed her blades, and said flatly, "Finally."

A few minutes later, the lair had settled into that rare kind of calm—the kind that didn't last long in a house full of ninja siblings.

Leonardo lounged on the couch, eyes locked on the flickering glow of the old TV screen. His favorite show, Space Heroes, was in full dramatic swing.

"Mr. Crankshaw, status report!"

"Status? I'll give you the status! We're gonna blow up in two seconds!"

[SLAP]

"Thank you, Captain."

Leo leaned in, mouthing the next line before the character even said it. "Gentlemen, I have a bold and daring plan. There's no time for hesitation. My orders must be carried out without question!"

"Aye, sir!"

Raphael walked by, arms crossed and unimpressed. "You know this show is stupid, right?"

Leo didn't even blink. "Space Heroes is a great show. And Captain Ryan is a great hero. Someday, I'm gonna be just like him."

Raph snorted. "Well, you do like to hear yourself talk. So you're on your way."

From the back of the room, Yuki rolled her eyes. "Great. Just what this team needs—another guy who thinks he's always right."

Leo turned his head just slightly, unbothered. "Captain Ryan is always right."

"Delusional," Yuki muttered.

Before Leo could answer, Donnie's voice cut through from the other side of the lair.

"It's go time!"

Everyone perked up.

Weapons in hand—bo staff, twin sais, twin katanas, nunchucks, twin tantos, and a meteor hammer—the six siblings gathered by the door, buzzing with anticipation. The air was charged. This wasn't just a mission—it was the mission. Their first time on the surface.

Splinter stood before them like a wall of calm in their rising storm of excitement. His expression was serious, but beneath it... pride.

"You are going up to a strange and hostile world," he said firmly. "You must maintain awareness at all times."

"Hai, Sensei!" they replied in perfect unison.

"Stay in the shadows."

"Hai, Sensei!"

"Don't talk to strangers."

"Hai, Sensei!"

"Everyone is a stranger."

"Hai, Sensei..." came the groaning chorus.

"And make sure you go before you leave. The restrooms up there are filthy."

"Sensei!" Mikey whined loudest, while Ariel cracked up beside him.

Yuki didn't laugh—just adjusted her blades and moved toward the exit.

Splinter's gaze softened slightly. "Good luck, my children."

The manhole cover creaked open.

Street sounds poured down like a promise. Honking cars. Distant chatter. Life.

The six of them couldn't contain their excitement.

"Here we go!"

"I am so pumped!"

"Surface time!"

"Oh, this is gonna be epic!"

"Shotgun roof patrol!" Ariel shouted as she scrambled up the ladder.

"Look both ways before crossing the street!" Splinter called after them, shaking his head.

They were already gone.

And the world above had no idea what was coming.

The world above was something else entirely.

The six of them emerged from the manhole one by one, stepping into the open night for the very first time. New York City stretched around them like a living, glowing dream—towers of glass, honking horns, flickering signs, and people rushing by with somewhere to be.

For mutants raised in the dark... it was blinding.

Raph blinked up at the skyline. "It's so beautiful."

"The city is just full of possibility," Leo said, arms spread wide. "There could be an adventure around this corner... or... or this one... or this one! There's not—but there could be!"

Donnie was already glued to the display window of an electronics store. "Oh, my shell—is that the next-gen cadmium processor with quantum encryption?!"

Raph glanced at him, unimpressed. "Is it?"

"It is!" Donnie gasped, pressing his face to the glass.

Meanwhile, Mikey had his own discovery: a blinking neon sign down the block.

"Guys, guys! Check this out!" he shouted. "It's a hand made out of light! Now it's an eye! Now the hand again! The eye's back! It's a war!"

Ariel ran up beside him, equally dazzled. "It's like the sign is trying to communicate."

Raph groaned and pulled Mikey and Ariel away. "Come on, geniuses."

"But the eye!" Mikey protested as he was dragged away.

Yuki stood a little apart from the group, arms folded, her gaze scanning everything—not in wonder, but calculation. She didn't smile, didn't gasp. But her eyes never stopped moving.

This place is loud, she thought. Messy.

Suddenly, a pizza delivery kid rolled to a stop at the curb nearby, fumbling with his phone. He glanced up—and froze.

Six strange figures stared back at him. Four mutant turtles, and two mutant ferrets.

Raph growled instinctively.

The kid screamed, dropped the pizza, and peeled away on his scooter like his life depended on it.

A single pizza box spun through the air, landing gently on the sidewalk.

"That was kinda fun," Raph said with a shrug.

"We're too exposed out here," Leo said, stepping forward. "Come on. We should move—now."

The group started down the alley—but one of them paused.

Ariel stared at the fallen pizza box like it had just descended from the heavens.

The six siblings gathered around the pizza box after bringing it to a roof.

"Pizza," Mikey breathed, eyes wide with reverence.

"Should we open it?" Donatello asked, peering at the box like it might explode.

Leo held up a hand. "Careful. It could be dangerous."

"You say that like it's a bad thing," Ariel said, bouncing on her heels. "Dangerous pizza sounds awesome."

Yuki stood back, arms crossed, unimpressed. "It smells good. Open the box."

Donnie slowly lifted the lid.

Inside was a full, untouched pizza—still warm, cheese glistening under the moonlight.

"I think... it's food," Donnie said, stunned.

"It's not like any food I've ever seen," Raph muttered, skeptical.

"I'll try it," Mikey volunteered, naturally.

He took a tiny bite.

Then froze.

His pupils dilated. His arms stiffened. His soul briefly left his body.

Then—chaos.

He devoured the slice in one breathless, frenzied chomp.

"Uh... yuck," he lied horribly, wiping his mouth. "You guys won't like it. I'll just take the rest."

"No way!" Leo lunged forward.

"Nuh-uh!" Donnie added.

"Back off!" Raph barked, already reaching.

"I never thought I'd taste anything better than worms and algae," Raph said, chewing with his mouth full. "But this—this is amazing!"

"Right?" Mikey grinned through another bite. "I love it up here!"

Ariel took a bite and immediately gasped. "My tongue is crying."

Yuki didn't move at first. Then, finally, she plucked a slice from the box, took a small bite, and nodded once. "Acceptable."

Donnie leaned toward her. "That's high praise from you."

"I said 'acceptable,' not 'life-changing.' Calm down."

They all sat in a loose circle now, laughing, chewing, and soaking in the city from above.

Later, they hopped across the rooftops like shadows, laughter trailing behind them in the wind. The city was alive with light, noise, and motion—and for the first time, they weren't just watching from below.

They were in it.

A part of it.

"All right, guys," Leo said eventually, slowing to a stop. "It's getting late. We should probably head back home."

"Guys!" Donnie suddenly hissed, dropping low. "Look at that."

Down on the street, a man and a teenage girl walked side by side—Kirby O'Neil and his daughter, April.

Donatello's heart nearly stopped. He leaned forward like gravity itself was pulling him toward her.

"She's the most beautiful girl I've ever seen," he whispered, eyes wide.

Raph raised a brow. "Isn't she the only girl you've ever seen? Aside from our sisters, I mean."

"My point still stands," Donnie said dreamily.

Ariel crawled up beside them, peeking down. "Ooh, she's pretty. Not prettier than me, though."

Yuki rolled her eyes. "Focus."

And then—

Screech!

A black van skidded to a stop in front of the pair. A group of men in dark business suits—led by a quick, wiry figure known as Snake—piled out and surrounded them.

Kirby froze. "What? What is this?"

April backed away, eyes wide with panic.

"They're in trouble," Donnie breathed.

"We gotta save 'em!" Ariel added, gripping her meteor hammer tight.

Leo's hand went up quickly. "Splinter's instructions were very clear. We're supposed to stay away from people. And bathrooms."

"I thought you wanted to be a hero," Raph challenged, voice low. "Since when do heroes ask for permission?"

Leo flinched.

"They don't," he admitted. "But..."

"Well, I'm going!" Donnie shouted, already leaping down.

"I'm not missing this," Raph growled, following.

"Woohoo! First mission!" Mikey cheered as he dove after them.

Ariel let out an excited squeal and bolted after her brothers.

Even Yuki—hesitant for only a breath—sighed and leapt after them with practiced grace.

Leo stood alone for a moment, caught between duty and instinct.

He looked down at the chaos unfolding below.

"...Shell," he muttered, and jumped.

Below, the men had already begun dragging Kirby and April toward the van.

"Help! Help!" April screamed.

"Hey!" Raph shouted, diving into the chaos with a punch that floored the nearest goon.

Donatello followed, bo staff swinging with precision—but his eyes kept flicking toward April. Something was wrong. These guys didn't move like normal people. Every hit sent them reeling with strange, glitchy warbles—like they were short-circuiting.

Leo leapt in next, katana slicing clean through one of the attackers' ties. But just as he pivoted to follow up—

Yuki stepped directly into his path, her twin tantos flashing as she cut down another attacker.

Leo swerved, almost stumbling. "Yuki—!"

"Don't slow me down," she snapped, not even looking at him.

"I had that guy!" he growled.

"And you were too slow," she muttered back.

Meanwhile, Mikey and Ariel were weaving through the chaos on their own wavelength.

"Hot nunchuck fury!" Mikey yelled, spinning wildly.

Ariel tried to match him, swinging her meteor hammer in wide, clumsy arcs. "Look out, bad guys! I've got spinny rage!"

Unfortunately, she also had terrible aim.

CRACK!

The weighted end of her weapon slammed right into Mikey's shoulder.

"AAHHH—ARI!" Mikey cried, spinning out and crashing into a trash can.

Ariel froze mid-swing. "Oh my gosh! I'm so sorry! That wasn't for you!"

"Why does it always hit me?!"

Back at the van, one of the suited men slammed Donatello with a mechanical punch that sent him sprawling.

"Oh, come on!" Donnie groaned, shaking it off.

Another man lunged at Leo, and this time he managed to land a hit, knocking the leader to the ground.

Then—

April screamed.

One of the men had grabbed her and was dragging her toward the van.

"Hey! Cut it out! Stop! Let go of me!"

Donnie's eyes snapped to her. Instinct took over.

He hurled his staff with perfect aim, then sprinted in and caught her mid-fall, holding her protectively.

April looked up at him—her eyes wide in terror—and screamed.

Donnie screamed back, panicking, and immediately dropped her. "No, no! Don't worry! We're the good guys—!"

She screamed again.

At the worst moment possible, Mikey stumbled back into them—dazed and dizzy from the earlier hammer hit.

Donnie turned just in time for Mikey's flailing nunchucks to whack him across the head.

"Whoops! Sorry!" Mikey winced.

"Watch it!" Donnie hissed.

A massive goon slammed into them both, sending them crashing into a pile of trash cans.

Donnie sat up in time to see the van doors slam shut—April inside.

"They're getting away!" he shouted, taking off down the alley.

The others followed.

"You just jabbed me with your sword!" Raph yelled mid-run.

"I didn't know Yuki was gonna block my swing!" Leo snapped back.

"This is why I don't work with teams," Yuki muttered under her breath as she sprinted ahead.

"I was just trying to help!" Ariel says. "Why does my hammer hate Mikey?!"

Neither Mikey or Ariel noticed the others had ran ahead.

One last thug—taller, broader, and strangely silent—emerged from the shadows of the alley. He moved with eerie calm, steps too smooth to be human.

Mikey stepped forward, twirling his nunchucks like a pro. "You think you're tough, huh? Think you can stand up to my hot nunchuck fury?!"

Ariel popped up beside him, gripping her meteor hammer. "Yeah! We're like... the final boss battle! ...Or the warm-up to the final boss battle. Either way!"

Mikey charged, swinging hard.

The man caught one of the nunchucks mid-air—and flung it across the alley.

Mikey blinked. "Huh? I see. Well then—AAAH!" He turned and bolted.

Ariel screamed and followed. "What was the plan?! Was that the plan?!"

The man chased them into a narrow alley, gaining fast.

Mikey whirled around, heart pounding, and yanked out his kusarigama. "Stay back!" he yelled, swinging it wildly.

Ariel ducked with a shriek. "Hey! Warn me when you do that!"

But the blade—purely by accident—slashed the man across the face.

Then—beeping.

The man staggered backward, face twitching. Sparks danced across his skin.

"What the shell...?" Mikey whispered.

The man collapsed. Mikey cautiously nudged him over with his foot—and froze.

Beneath the torn skin, a metallic face stared up at him. Wires. Circuits. Cold, glowing eyes.

"That is all kinds of wrong," Mikey breathed.

"Is he a cyborg?! Or a robot?! Or—" Ariel's voice cut off with a shriek as the man's head cracked open.

Out burst a pink, screaming brain-creature, its mouth open in a distorted screech.

"AHHHHHHH!" Mikey screamed as it launched itself onto his face.

"MIKEY!" Ariel shrieked, swinging her hammer uselessly as he slammed into the wall, flailing.

"GET IT OFF GET IT OFF GET IT OFF!"

Mikey finally got both hands under it, yanked with all his strength, and hurled it across the alley. It hit the wall, screeched, and scurried into the shadows with a wet slurp.

Breathing hard, Mikey panted, trembling. Ariel ran up, eyes huge.

"...We are never going out alone again," she said.

"Agreed," Mikey wheezed. "Let's go find the others before another alien brain tries to eat my face."

They bolted.

Mikey came sprinting down the alley, panting and wide-eyed, arms flailing like he was either on fire or fleeing something worse.

"GUYS! GUYS!" he shouted. "You're never gonna believe this! That dude—he... he had a brain!"

Leo turned with a frown. "We all have brains, Mikey."

"Not all of us," Donnie muttered, not even looking up from the device in his hands.

"In. Our. CHESTS?!" Mikey shrieked, jabbing at his plastron.

"No, Mikey," Leo said, not amused. "Not in our chests."

"You're not listening to me!" Mikey yelled, spinning in place.

Ariel stumbled up beside him, out of breath. "He's not crazy this time! It was real—it was like this screaming jellyfish brain with claws and it—jumped on his face!"

From where she stood with her arms folded, Yuki arched an eyebrow. "You expect us to believe that a robot with a sentient brain inside it just happened to find you two—and no one else?"

"It was real!" Ariel insisted, pointing wildly.

Mikey threw up his hands—and SMACK!

Leo slapped him lightly across the cheek.

Mikey blinked, betrayed. "Did you just slap me?!"

"I was calming you down."

"WHY would that CALM ME DOWN?!"

"I mean... fair question," Donnie said absently.

"I think they're both having a shared hallucination," Raph added dryly.

Yuki's tone was ice. "If there was something that dangerous, you let it get away."

Mikey groaned. "JUST COME LOOK!"

The group followed him back to the alley. Mikey pointed wildly.

"There! Right there! He was lying right there!"

Everyone looked.

The alley was... empty.

No body.

No robot.

No brain.

"...Gone?" Mikey whispered, voice cracking.

Mikey and Ariel exchanged looks, as their older siblings glared at them and began walking away.

Back in the lair, things were anything but calm.

Splinter's voice cut through the air like a blade. "So... your inability to work together allowed all of them to get away."

The six sat in a loose, sulking half-circle—bruised, grumbling, and pointedly not looking at each other.

Raph folded his arms and scoffed. "Well, maybe if I didn't have to waste time arguing with hero boy, I could've saved them."

Leo glared at Yuki. "Well, if someone hadn't stepped in front of me mid attack, I would've had it."

Yuki scoffed. "Well, Donnie is the one that went off on his own to save that girl and scared her."

"I would've succeeded in saving her if Mikey hadn't come out of no where!" Donnie exclaimed.

"I was dazed from being hit by Ari's hammer!" Mikey threw his hands up.

Ariel gasped. "Why am I being blamed?"

Mikey crossed his arms. "Because you hit me!"

Ariel pointed back, panicking. "W-Well, someone let us go up there in the first place! Right?!"

The room fell silent.

All eyes turned to Splinter.

Ariel froze.

"...Oh no," she whispered.

Splinter raised an eyebrow.

"I—I didn't mean you, Sensei! I meant like... society. Or fate! Or—I don't know, mutant destiny?"

A beat of silence.

Then Splinter sighed deeply, folding his hands. "No, Ariel. You are right."

Ariel blinked. "I am?"

All five siblings turned to stare at her.

"She is?"

"You were not fully prepared for what was up there," Splinter said, tone calm. "I trained each of you to fight as individuals... not as a team. And as your teacher—your father—that responsibility is mine."

Mikey leaned toward Ariel and whispered, "You accidentally won the argument."

"I don't feel like I won..."

"Perhaps," Splinter continued, "in another year, we may try again."

Donnie practically jumped to his feet. "Another year?! Sensei, people were kidnapped! They don't have a year!"

Donatello stepped forward, eyes intense, voice cracking with urgency. "You weren't there, Sensei. You didn't see the way that girl looked into my eyes. She was scared. And she was counting on me—on us—to save her."

Splinter turned slowly, his gaze drifting to a quiet corner of the lair, where an old photo hung: a beautiful woman holding twin baby girls, warmth in her smile. The distant crackle of fire echoed in his memory.

"...Yes," he said softly. "You must save her."

Leo nodded firmly. "I agree, Sensei. But... in that fight, we weren't exactly a well-oiled machine."

"Like that robot with the brain thingy," Mikey added helpfully.

"Give it a rest," Raph muttered.

Splinter folded his hands behind his back, speaking slowly. "If you are to fight more effectively as a unit... you will need a leader."

Leo straightened immediately. "Can I be the leader?"

Raph scoffed. "Why you? I kicked your butt. I should be the leader."

Donnie stepped in. "I'm smarter than all of you put together. Clearly, it should be me."

Mikey raised his hand. "No way. It should be me!"

Everyone turned to him.

Mikey blinked. "...Okay, no reason. I just think it'd be neat."

Yuki folded her arms. "I should lead. I'm the oldest. And the most disciplined."

"Pfft," Raph huffed. "You're a lone wolf with a superiority complex."

"Exactly. I lead myself. You're welcome to follow," she said coolly.

Ariel popped up beside Mikey. "I vote me! I've got energy, style, and a really cool weapon!"

"You probably gave Mikey brain damage with that weapon," Donnie pointed out.

"Accidents build character," she chirped.

Splinter closed his eyes and exhaled through his nose.

"This is a difficult decision," he said evenly, already walking toward his chambers. "I will meditate on it."

A long beat of silence passed.

Then—

"...It is Leonardo."

Leo lit up. "No hard feelings, Raph?"

Raph shoved past him with a glare. "Stick it in your shell."

"That's some bull," Yuki scowled, glaring at Leo. "I'm older and I built him after he beat you!"

"Sorry, Yuki—"

"Whatever."

Night had fallen over the city, casting the rooftops in a faint amber glow. The six siblings crouched low above a shady-looking building, cloaked in shadow and anticipation—well, most of them were.

Mikey leaned toward Donatello, whispering, "Explain to me one more time what we're doing here."

Groans rose from the group.

Leo didn't even look at him. "Mikey, we've been over this. That building has the same logo as the van that kidnapped April and her dad. If we wait here long enough, someone from that group will show up. And when they do, we make them tell us where they took them."

Mikey nodded solemnly. "And then we got ourselves a van!"

Leo sighed, rubbing his temples. "Just hit the guy I tell you to."

Mikey grinned. "Will do!"

Ariel leaned into Mikey with a whisper. "Can I hit someone too? Or is it a first-come-first-smack kind of thing?"

"Depends who gets the coolest catchphrase," Mikey whispered back.

Yuki, crouched beside Leo, didn't take her eyes off the alley. "This is a bad plan."

Leo's expression tightened. "It's a watch and wait plan."

"It's a slow plan," she muttered. "We should already be inside."

"We're doing it my way," Leo said without looking at her.

Raph leaned forward. "You sure this is gonna work?"

"Trust me," Leo said confidently, scanning the street below. "They'll be here any second."

A pause.

Ariel squinted. "How many seconds are we talking? Like... city seconds? Or ninja seconds?"

Mikey nodded sagely. "Ninja seconds are, like, longer, right?"

Donnie groaned. "This is gonna be a long night..."

Two hours later...

"I'm thinking of something green," Mikey whispered dramatically, flopped over the edge of the rooftop. "Gaaa-reen... ga-reen..."

Donnie didn't even glance over. "Is it Raphael again?"

Mikey gasped. "Man, you're good at this."

Yuki huffed from where she crouched beside Leo. "We should've gone in hours ago. Or I should have. Alone."

"You mean so you could fight everyone and learn nothing?" Donnie asked without looking up from his tech.

Yuki shrugged. "Sounds efficient."

Ariel sat with her legs swinging off the edge, already braiding wires from a broken antenna. "This rooftop is so boring. Why couldn't the bad guys hide in an arcade or something?"

Raph groaned and crossed his arms. "Give it up already. The guy's not gonna show."

"We have to be patient," Leo replied calmly, still scanning the street below.

"No," Raph muttered. "You have to come up with a better plan. Because the six of us standing here with our thumbs up our noses—"

"I don't think mine would fit," Mikey chimed in helpfully.

"—is pointless."

Leo squinted at the alley. "You sure about that, Raph?"

A low rumble echoed from below.

Raph sighed in defeat. "He just showed up, didn't he? I should've complained two hours ago."

A sleek black van pulled into the alley—suspicious, familiar, and way too casual.

Leo straightened, eyes narrowing. "Everyone, I have a bold and daring plan. There's no time for hesitation. My orders must be carried out without ques—"

He turned.

"...Guys?"

The rooftop was empty.

Below, his siblings were already halfway down the fire escape.

Ariel waved at him cheerfully. "Hurry up, Commander!"

Leo groaned and bolted, sliding down the railing in one smooth motion.

The six landed with precision, surrounding the driver as he turned around—expression blank, eyes cold.

"All right, buddy," Raph growled, cracking his knuckles. "We can do this the easy way—or, my vote, the fun way."

Weapons gleamed in the moonlight.

Donnie stepped forward, bo staff at the ready. "Logically speaking, there are six of us and one of you. What are you gonna do?"

The man answered by pulling out a plasma blaster and opening fire.

"MOVE!" Leo shouted as lasers blasted the pavement where they'd just stood.

The group scattered—Mikey diving behind a dumpster, Donnie vaulting onto a fire escape, Ariel yelping and nearly tripping on her own hammer.

"You had to ask!" Raph yelled at Donnie, scrambling for cover.

The driver dove into the van and slammed the door.

"Don't let him get away!" Yuki snapped, already sprinting after it.

The van screeched into motion, tires screaming as it barreled down the alley.

"He's getting away again!" Donnie shouted.

"No, he's not," Leo muttered, already climbing. "Everyone up—rooftop pursuit!"

Back on the rooftops, the chase was chaos in motion.

The six siblings raced across buildings with practiced agility, wind rushing past them as the van sped below. Raph lunged from a ledge and grabbed onto the side.

"For once," he muttered, "I'm ahead of—"

WHAM!

The driver scraped the van against a dumpster, sending Raph flying into a wall with a dull thud.

"Ow..."

"Raph's down!" Ariel called out mid-leap. "Repeat—flying meatball has been grounded!"

Laser fire burst from the van's side, forcing the rest to scatter.

Donnie and Mikey split, each weaving through obstacles with finesse, while Yuki ran rooftops parallel to Leo, blades drawn.

"We need to end this," she said.

"I've got it," Leo muttered, breaking into a final sprint.

He hit the edge of the roof, drew a shuriken, and hurled it with perfect precision.

THUNK.

The star embedded into the van's front tire.

BOOM.

The tire exploded.

The van skidded sideways, flipped, and crashed in a thunderous mess of metal and sparks, landing on its side with a hiss of steam and silence.

Leo landed lightly at the edge of the roof, katana still drawn.

"Now we're getting somewhere," he said with a smirk.

Yuki landed beside him and nodded. "Finally."

Ariel crashed down behind them, slightly less gracefully. "Did we win?! That felt like a win!"

Back on the ground, the six crept toward the wreckage, weapons drawn and steps cautious.

Leo peeked around the corner of the smoldering van and raised a series of precise hand signals.

Raph frowned. "I don't know what that means."

"Go around back," Leo sighed.

"Then just say that," Yuki muttered under her breath.

They moved together, creeping to the rear of the van. Raph grabbed the door and yanked it open.

A small metal canister rolled out and clinked onto the pavement.

It spun to a stop at Mikey's feet.

Inside, green-blue ooze pulsed faintly.

Everyone leaned in.

Mikey stared down at it, eyes wide with awe.

"...Mom?" he whispered.