Timestamp - 11 months after the Krang was defeated. Leo has fully healed from his wounds.

Four turtles parkoured their way across the city. What started out as a comforting lazy Saturday morning was suddenly interrupted by a Donnie Alert. Someone robbed the museum of natural history, taking a priceless piece of meteorite with them. 

Leo's voice boomed over the loud street noise, "How much further, Don?". Donnie checked the map on his wristband, "Just five more streets down, wait no- six, gah seven!"

"Can't you get pin the baddie's location?" Mikey frowned as the numbers began to confuse him. "Who moves that fast anyway? It's like they have their own portal or somethin'" Raph complained.

Donnie and Leo shared a look, both possibly thinking the same thing. Donnie nodded, "Probably. With all the crazy - ugh- things we went through -grr- all those years back? I would not be surprised!" the genius concluded over grunts as he moved delicately around some hap-hazard clothing lines. 

Leo grimaced as he eyed the congested streets below, "A good reason not to take the Turtle Tank. We'd only get stuck in the traffic."

"Well, they better be portalling somewhere important. I did not miss my Saturday Morning Breakfast Special just to come out and bash some lowlife thief," the youngest spoke for everyone.

"Yeah!" the four brothers cried out in the agreement. Saturday mornings are not to be taken lightly.

The purple turtle suddenly broke to a stop and the leader in blue quickly signaled Raph and Mickey to do the same. 

The genius removed this tech wristband and hunched over it. His brows furrowed in intense concentration. "What is it, bro?" Leo asked as he leaned on Donnie's battle shell. The boys huddled together as the genius began to explain. 

"My tech managed to track the use of mystic energy from our loose baddie."

"Mystic? So we are dealing with a yokai or a mutant," Raph asked quietly and waited for Donnie's reply. The boys watched silently as the tech whiz suddenly pulled one of Leo's swords and tapped into the mystic portal energy with Donnie's own mystic powers. 

The purple markings on his shoulder began to glow brightly as Leo's energy was summoned into the blades of the sword making the slider's body markings glow as well. Hamato Ninpo thrummed through their very beings, coursing through their veins with fire and electricity.

"Possibly. Could be even human but who's to say anymore? Segue way, I managed to triangulate the assailant's next three exact positions to which they would be portalling to, enabling us to portal right to them at the exact same time," thus bringing Donnie to his usual rambling, "You see, the use of mystic ninpo has only elevated my arsenal in high-unreasonably-futuristic-tech and it has enhanced my tech to levels never known to be ever reachable by the likes of the normal man.... EheheVIL LAUGH " 

The brothers of orange, red, and blue all groaned but wore smiles of amusement at the purple's glorious basking of power. "Sure thing, Don. As much we would love to hear your nerd rambling, we have a villain to catch, dear brother," Leo noogies Donnie and swiped his wristband to his eyes. "Alright boys, next stop ... New Jersey?" 

The Hamato boys simply shrugged. Leo drew his swords and expertly slashed at the sky. The trademarked smirk played on his lips as the neon blue portal opened up with crackling electricity. "Let's get to it boys. Hachi Machi!!" The others were pushed in unceremoniously then the turtle in blue stylishly backflipped into the portal.

---

New Jersey, finally. 

A comlink was activated "...I have the meteorite is in my grasp. I will meet you at the rendezvous at-" the person gasped, dropping the call. Something in the air felt.... electrified?

An ear-splitting crack shook the atoms in the air and a blue portal zapped in front of the thief's face. Behind the thief's mask, their eyes widened in shock as four yokai burst out.

"HOT SOUP!" and the portal collapsed behind them dramatically. 

"Shit!" The thief quickly summoned some mystic energy in their palm and snapped a silver portal to life. "Bye suckers!" they greeted the turtles. As their first foot entered the portal the thief was yanked backward by a golden chain. 

"You ain't going nowhere, baby!" Michelangelo victoriously shouted then yanked the elongated chains of his nunchucks and forcefully twirled the thief away from the portal. 

The thief landed with a thud on the ground, watching as their silver portal fizzled away. 

"You've got to ask yourself one question: Do ya' feel lucky? Well, do ya, punk? Cause Neon Leon, and his backup turtles, gotcha'" The brothers groaned. 

The thief was cornered but not willing to give up yet. With lightning-fast moves, they slammed their palms together and a puff of silver smoke engulfed their being. 

The brothers stood in shock for a minute until -poof-, the silver smoke appeared behind them and the thief activated another portal. "Engage, boys!" Leo ordered with style and the turtles grinned wildly, moving with lightning speed. 

Raph activated his sai's. Red mystic energy, fueled by his Hamato ninpo burst out in flames as he punched the ground. The thief was thrown off balance and missed their portal jump. The fight had started. 

"First to knock out the thief is the winner of forever!" Mickey launched his chucks, elongating them to wrap around the thief, and pulled their body towards him, "GIVE US THE SPACE STONE!".  A smug smile lay hidden behind the mask. Mickey watched as one of the thief's hands clutched the gold chains. "Wha...?", a burst of silver energy ran up the chained weapon.

OOF- Mickey was shot back by a silver shock wave and was thrown into Raph, the thief jumped out of the loosened chains and landed gracefully before throwing the regular-sized nun-chucks to the ground. "BROS!" Leo eyed the thief making a run for another portal, "Oh no you don't,". Leo's portal burst right in front of the enemy's. "Leaving so soon?" The thief gasped and dodged the incoming slice of Leo's sword. "How rude, we just got to the party!" The slider began to drive the thief away from the portal. 

The thief was about to activate another portal but their hand was caught by Donatello. "Make way for Von Ryan! Fibonacci! " The turtle in purple stopped the enemy's hand with the tech-bo and slapped a titanium cuff on the thief's left hand with his robotic claw then sent a  kick to their chest. He expertly spun them and Leo slapped another cuff to the right hand. Donnie used his tech-bo to push the thief away.

They stumbled but found grounding. While the turtles gathered, Donnie watched with amusement as the thief tried to snap their way out of existence. It only fueled the genius' ego when he heard the frustrated grunts of the thief. Leo leaned on his twin, watching the thief run a string of curses as they tried to tirelessly conjure their own portal. Raph protectively closed Mickey's ears.

The emotionless mask of the thief turned for a brief moment to asses their captors. The turtles were powerful and the thief was outnumbered four to one. Running away now would delay the inevitable doom of getting caught and they had no idea how to remove these cuffs. Running away would be pointless, so 'Stand your ground and don't show fear'. They thought to themselves.

"No use portalling now, dumdum." Donnie cocked an eyebrow. The thief looked up to find all four turtles wearing the same smug look. Still, they went back to portal making. The brother's watched with mock amusement as the thief only produced wisps of mystic energy. "Save your energy, punk! Those cuffs, my made yours truly, are capable of blocking off one's connection to any form of mystic force." Donnie explained, taking a step forwards. 

The thief stood their ground and warily watched the purple nuisance. As if to show utter disregard for the turtle's warning, the thief brought both hands to the center of their abdomen. Donnie watched with peaked interest as the thief touched their thumbs and middle fingers together and folded the rest in. The brother's picked up a light hum of electricity suddenly filling the air. Donnie knew the strength of the cuff but was eager to test just how much mystic power it could hold off. He did test it on his brothers, as usual, but it only got him so far. Though not far enough to make a solid conclusion. 

"Donnie.." Leo warned but it fell on deaf ears. If Donnie didn't react, his brothers would not as well. They trusted Donnie's judgment over his own tech. The four turtles watched as streaks of silver light began to accumulate around the thief. Since Donnie was the closest to them, he could notice the strain it took to fight the cuff power block. The thief's body was shaking.

"Alright, you proved your strength, but there is no point to strain yourself. Surrender, you're surrounded." Donnie demanded.

The thief showed no signs of relenting. Eyes watching fearfully from behind the mask, they groaned and summoned more mystic power. The wind seemed the catch up as their mystic energy seemed to grow stronger. 

"Donnie..is this safe?" Raph asked warily after noticing the sudden power shift, but Donnie was too fascinated by the sheer stubbornness of the wrongdoer. A spark of silver light danced over the cuffs, showing the strains of  Donnie's tech fighting over the silver mystic power. 

"Fascinating! NO! SPELLBINDING! ENTHRALLING!"

Donnie's loud exclaim drowned out his brother's yells of panic as the wind currents began to pick up with violence. "Such power and wit! The strong sense of determination! An opportunity to witness this is beyond my wildest imagination. The data that could potentially make my mystic tech even greater, and bolder is in the center of my palm!"

The genius was more than fascinated watching the spectacle around him. Purple mystic energy rose from the cuffs and began to fight away the silver energy of the enemy. That was not the only thing that happened, for, within the souls of the thief and Donatello, a cord was struck. Something so primal and innate woke within them. The two unknowingly locked eyes. 

For a moment in time, the thief could feel every thrumming fiber of the turtle before them. Their energies no longer fighting but bonding and intensifying. Donnie gasped, taking a step back when he felt the spike of energy rise in the person before him. His body tingled as the silver mystic energy seared his veins, giving him a  taste of immense power as he had never felt before. His Hamato Ninpo beamed with radiance as his purple marking took on a silver outline and glowed brightly. Donatello grasped at his chest.

He felt power.

He felt fear.

He felt ... belonging. 

He..he felt .... HER!

"Wait? You're a girl?!" 

 That small thought shattered whatever connection the two experience. A strong blast of mystical energy relapsed into the cuffs and was beamed away. The turtles were pushed down by the blast of radiating mystic force. The thief was thrown backward while the facemask cracked and split down the middle.

---

"Don... Donnie... Hey, hey Donnie!" Three blurry figures loomed over the purple, now groaning, Othello Von Ryan, a.k.a Donnie. 

"Get off me..." Donnie weakly pushed his brothers away. "Gah, what happened?" He said, gently rubbing the back of his head. "The blast, Dee. The whole, -WHOOSH, KABLAMMO KAPOWW!" Mickey flailed his arms around like a wild chicken. Raph gently pushed Mickey into Leo's hands and helped Donnie up.

"You tell me, buddy. The thief did some mystic energy stuff and next thing we all knew, the energy exploded and BOOM, here we are," Raph said, turning around to make sure his other two brothers are doing fine. 

"You alright? You look like you just went through a heavenly revelation or something.." Leo pointed to Donnie's surprised face. Finally, after a few seconds, it clicked in him. Donnie remembered that weird thing between him and the.... and the "..THE MYSTIC SHE THIEF!"

Donnie pushed himself up to shake Leo like a pepper shaker. "What happened? Where is the she thief?"

"She thief? You mean that thief?" Mickey pointed out innocently, saving Leo from Donnie's deathly shakes. 

The purple genius let out a strangled breath as he was reminded of the strong connection earlier. It grossed him out just as much as it yanked on his bleeding curiosity. Silently, the other brothers followed close behind Donnie as they approached the mysterious figure. 

The thief grunted in slight pain. "Owww..." she muttered, rubbing her head and pushing a mass of black curly hair out of the way. Little did she know she was being watched intensely by four blushing teens.

When she turned to face them. Her eyes passed over everyone but locked right in when she found Donnie's and there was the connection again. A flash of purple ran glazed over her eyes, and a flash of silver reflected in his own. Chests heaving, hearts unknowingly beating as one. The two teens remain entranced with one another, noticing the flush pink rising on their cheeks. Leo glanced at his twin and back at the girl, then back at him.  Neon Leon broke the silence with his famous oneliners. 

Leo smirked and slung his arm over Donnie, yanking them closer to the thief "Sooo..... a cutie and baddie huh?" 

"Wha-?" Donnie blinked furiously. The thief seemed to snap out of her trance too, deciding them to glare at the turtles. Raph and Mickey just seemed lost. "No wonder you got Don Boy all flustered up. Ya know' cute but mean? His type and all"

Donnie had half the nerve to slap Leo, but with the girl in front of him, he just froze. Leo took matters into his hands and let go of Donatello. The girl shuffled away weakly as the slider approached her. "Hey, wait-" she tried to fight but he shushed her playfully and bound her hand to her front, and covered her eyes with a blindfold. "As leader, I say we bring mystic she thief to the lair for interrogation, and other purposes for teasing Donnie-" Leo looked to Raph for a professional leader-ing opinion on the first plan and Raphael nodded, giving Leo a thumbs up.

"Hrmph!" Donnie froze as the girl was shoved into his hands."Keep an eye on her 'purple dude'" said Leo a little too loudly so the girl heard him. Donnie just stared down at her helplessly, speechless, definitely not aided by the feeling of his heart beating right out of his chest for some reason unknown to him. She felt his shaky hands gently gripping her shivering upper arms. Hearts unknowingly beating as one.

"But why?" Mickey put his fingers to his lips, questioningly. Leo grumbled and gestured to Donnie's face and the apparent blush creeping from under the girl's blindfold at the knowledge of being held extremely delicately but the 'purple dude'. Raph then began to giggle... "Owh... OWHHH,"

Mickey finally came to his senses, "Hot dang, son! Donnie has a cr-".  Leo slapped his hands over Mickey's big mouth and laughed.

"Vamanos, hermanos. Let's bring the party to the lair." He declared and sliced a portal open. 

So the story begins.