Hello everyone!

I've been wanting to join two fandoms I adore (again) with all my heart in a fanfic but I never had a decent idea until recently. I admit I originally wrote this last year but only shared it with a friend and fangirled between each other. I felt confident to post it but despite liking my idea for this fic, I wanted to re-write the first chapter. Needless to say, I'm glad I did it because I like this version more than the original.

A FEW NOTES BEFORE WE START. THIS IS VERY IMPORTANT TO KEEP IN MIND

1) I'll be using the 2014/2016 movie universe for the TMNT

2) While this is a crossover, yes, I'm doing something different with the PPG. I made a whole different verse for the girls in which I combined ideas from both the original cartoon and the anime. Thus we have a different version of the PPG that follows similarly to the anime, in which they aren't sisters and they got superpowers at the age of twelve and have weapons, but have the same powers they have in the original series (I'll be referencing Blossom's ice powers and Bubbles' ability to talk to animals, for example). Blossom, Bubbles and Buttercup are their superhero names, their civil names will be known in the next chapter just I'll let you know now... one is American, the other is French, and the last is half Japanese and half American. And yes, their personalities will also be a mix of both the cartoon and the anime. If you don't like that idea then... I'm sorry?

3) I don't know how frequently I'll be able to update this fanfic. I have another to continue but I'll also start college this year so... I don't know how I'll be able to balance my time during the year, but I promise to write as often as I can :)

4) English is not my first language so I apologize for any mistakes u_u

Neither "TMNT" nor "Powerpuff Girls" belong to me

[CHAPTER I]

Training now felt like any other day of training, at least for four mutant turtle brothers felt like that. And yes, I said mutant turtles because that's what they are.

It's been almost eighteen years since the incident with April O'Neil's father and Sacks, who used to be scientist partners and were working in a special project which involved mutagen, a rat, and four turtles. But Sacks was working for Shredder, a very powerful and intimidating criminal and leader of the Foot Clan, who wanted to use the mutagen O'Neil and Sacks have been working on to take over New York City. When O'Neil found out he destroyed the lab, so neither Sacks or Shredder had ways to take over. His daughter, April, used to frequent the lab very often when she was young, was there during the fire and she saved the animals, leaving the rat and the turtles in the sewer.

What none of them knew was that the mutagen in the animals took effect in a matter of days. The rat, named Splinter in the lab before the incident, took care of the baby turtles and became their father. The four turtles were also named in the lab and by April none the less: Leonardo, Donatello, Raphael and Michelangelo. They were good kids, but Splinter worried about them constantly. Until one day he found a way to protect them and to teach their sons how to defend themselves. That's how their training as ninjas began when the turtles were seven years old.

Years later Splinter could only smile at his sons while they battled against each other during their training. They've changed a lot during those years, made a lot of progress, and just now in these last years began to truly work as a team and not just as individuals. The incidents with Shredder and Krang were alarming, yes, and he almost lost his life thanks to Shredder, but his sons were brave and defeated the evil. Sure, the Kraang problem was worst considering they were dealing with aliens, but just like last time, the four brothers were victorious.

Nowadays, without Shredder, Kraang or even Baxter Stockman with the Foot Clan causing trouble around NYC, life for the teenage mutant ninja turtles was a normal as they could have it. Training during the day, chilling and laughing during the afternoon with the occasional visit from April, and the usual night patrol just to make sure everything is ok. Outside of April, only Bern and Casey Jones are the only humans to know about their existence.

And it was boring, at least to Mikey who wanted nothing more than to go outside of the sewers to enjoy himself.

"Don't you guys feel like thing have gotten way too boring around here?" Mikey asked his brothers as they jumped from one rooftop to another. They went out to watch an NBA basketball match (their team won) and now the brothers were making their way back home.

"What's wrong about that?" Donatello, the brains of the group, asked in return.

"I mean." Mikey made a quick jump to the next building, just after Leonardo, before explaining himself. "Sure, is good that we've defeated the Foot Clan and Kraang but... now we have nothing to do!"

"Mikey, we all agreed to not show ourselves in public." Leo began to talk without stopping in his tracks. "Now you regret it?"

"... a little bit, yeah." The youngest had a sad expression as he looked up at the stars.

Raphael didn't add anything to the conversation but he agreed with Mikey a bit. He missed the days when he could punch and smack the bad guys, and basically show off how strong he is. But before Mikey could complain about a bit more Donnie stopped in his tracks.

"What's wrong?" Leo asked, stopping as well.

"My sensors are detecting something."

"Criminal activity?" Raph finally spoke, arms crossed as he stared back at his genius brother.

"Wait—"

Donnie had to type something in his watch, which displayed a small glowing keyboard in the air to type in and a screen to see the info. His eyebrows furrowed in confusion once he got what was going on.

"I'm detecting movements from something my scanners can't recognise." He explained himself. "Or at least, not yet. Give me a second." And continued to type quickly.

"What could it be?" Raph frowned as well.

"Not Bebop and Rocksteady, they're in prison and Donnie would've been able to detect them," Leo said.

"Maybe..." Mikey began to talk, sounding very serious for a moment. "Maybe those are aliens..."

And for that, the youngest of the brothers only received a smack on his head by Raphael.

"What was that about?" He complained.

"We defeated Kraang. There's no way it came back so soon." The strongest of the brothers grunted in response.

"But it could be!"

As Mikey continued rambling about the possibility of Kraang's return, and Raph rolled his eyes at his little brother, Leonardo only chuckled at them before turning to Donatello who was focused on the small and bright screen in front of him.

"It's a giant monkey!" Donnie screamed.

"A what?" The turtle with the red bandana turned, he was the most confused at that answer.

"I said it loud and clear. My detectors found a giant monkey not too far from here."

"A giant monkey..." Mikey mumbled to himself as he tried to picture how big the creature could be. "Is it King Kong?"

Despite his question, none of his brothers bothered to answer back to him. Not even another smack on the head from Raphael.

"And where is it?" Leo asked once again.

"It's—"

Donnie was interrupted by a sudden explosion and a very loud one on top of that. The brothers turned around to see one of the best-secured buildings in all New York City burning from the right, and from the fire, it began to fly away a giant robot. The robot has a living creature inside. Suddenly they began to hear the sirens of the police arriving at the building, they thought the firefighters would be arriving soon enough as well. But now they could only focus on the robot in flames.

"... there." Donnie whispered, pointing to the robot. "It's right there."

"What are we waiting for?" Leo looked at his brothers with determination, the look of a true leader. "Let's go!"

Under his orders, the brothers followed the flying robot through the dark of the night, only the moon is their source of light without counting the usual light street from down below. But even then, they have to stay in the shadows, they made that deal with the police department, after all, to stay hidden and not let everyone know who are the real heroes of the city. They did it twice now, and their lives are still good.

Going fast and still remain hidden is something they'd mastered already and this is just child's play. They know the perfect spots to stop and relax without being discovered, how to jump and land without making noise, and so on and so for. They're ninjas, after all.

But as the turtle brothers made their way, from one rooftop to another, to the flying robot they saw three beams of light in the dark sky get to the robot in mid air, pink, light blue and green. Soon followed by attacks... lots of attacks. It was somewhat of a spectacle in its own way. But as expected with this display of action the robot fell on top of a very tall building and it was a miracle that it didn't explode from the fire or the attacks. The three colour points flew down to the same spot.

When they arrived at the building they knew well enough that they weren't alone up there, so they stayed silent and moved slowly, not doing risky moved and coming to the light while they walked to the 'crime scene'.

But then, the mutant turtles were surprised with what they saw.

The giant robot wasn't just on fire, it was destroyed. Only a few pieces remained together in its original place but everything else was cut in two, destroyed into a million pieces, or was being burnt by the fire. The 'living creature' Donnie had detected at first was nothing but a fake, a puppet that served as a double of the real monkey or so they supposed by what they were looking at. And in front of the robot stood three girls, all in uniform, a short dress with a jacket, gloves and shoes, plus a white belt. But each with their own colour (like the turtles with their masks), and the three girls looked very different as well.

The one in the middle had the pink uniform, with some white and black here and there. She looked average, at least in height and body proportions, for a teenage girl. Her long and beautiful red hair (well, to be more specifics her hair is orange, but that's still considered being a redhead) was held up in a ponytail with a red ribbon. She had her hands on her waist and was staring intensely at the robot. Or at least that's what it looked like to them since the brothers were staring at her back.

The one of the left has her uniform in light blue (and some minor touches of darker blue as well), she seemed to be the smallest of the three (again, this in height) and also the skinniest. But then again these are more assumptions because the said girl was kneeling next to the robot while checking out carefully something on her hand, was that metal? Her blonde hair, held up in two ponytails that were gracefully over her shoulders, stood out the most of her in the night, were her eyes blue as well? None of them could tell.

The last girl was standing on the right side of the robot. In comparison to the girl in pink, she was a touch smaller but her muscles were a different story. For a girl, her muscles stood out, even with the green uniform, while she stood there with her arms crossed; but even so, she didn't have a rough complexion, it was the opposite. Her short, dark hair was free and barely down to her shoulders, and it moved slowly with the breeze of the night. She was kicking the robot in frustration while mumbling to herself, her green eyes were filled with anger.

"I can't believe he escaped, and by tricking us with a freaking puppet!" The green girl screamed.

"Mojo Jojo has been thinking in better plans lately." The one in pink commented.

"Now you're congratulating him? The enemy?"

"It's good to acknowledge when the enemy is getting stronger, now we just need to find a way to defeat his new schemes."

"She's right." The blonde one stood up while joining the conversation. "But I can't help but wonder, what did Mojo want from New York? And, what is this metal?"

The other two approached their friend (and smallest of the three) who held her hand open with small pieces of the metal.

"We must take this to the professor, he might know what it is." The redhead spoke loud and clear, she seemed to be the leader. "And also alert the police department in Townsville. Who knows where the monkey could've gone."

"I don't know." The girl in green grunted. "But when we find him, I'll smack his stupid face."

During this whole exchange between the girls, none of the turtles made a sound. They didn't whisper to each other, they didn't move, they didn't even dare to breathe loudly, they just stayed silent while watching those three strange girls talk, and it seemed that they know things the brothers don't. Who is Mojo Jojo? Since when is there a city called Townsville? And more importantly, who are these girls?

Suddenly, something fell on the ground and the girls turned to their direction. Were they seeing them? Did they discover them even though they were hiding in the shadows? But how? The answer was right in front of them. One of Michelangelo's nunchakus was on the group and, since it was metal, when it fell it made enough noise for them to hear and turn to the turtles' direction. Mikey only laughed nervously at that before Raphael smacked him on his head for not being careful.

None of them knew if the girls really did see them. Before something else could happen the three flew away at high speed. The same three beams of light decorated the dark night until they were no longer in sight.

It's hours later from what happened last night. Now in the morning, the ninja brothers were once again down in the sewers. Leonardo was meditating, trying to find inner peace with all the noise his brothers were making; Raphael was in his room (or what could be considered a 'bedroom') training with his punching bag ; Mikey was eating pizza from last night while playing the battery, and he's not very good at it; Donnie meanwhile was with his computer investigating, looking for answers.

But all four brothers were thinking the same. Those three mysterious girls were in their minds since they returned home. Just who are they?

Donnie himself was the one with the most questions and did not move away from his computer every since they returned safe and told their father about it. Splinter told them to not worry too much about it but stay on they guards, this could be a new enemy and they had to be prepared. So as soon as the talk was over the brains of the family began to investigate. He checked security cameras from the building that was assaulted last night, hacked into secret government and policy files from this Townsville, and slowly but surely was joining the pieces together.

And just then, he called his brother.

"Leo!"

The leader in blue reacted quickly to the call, standing up from his meditating spot and approaching Donatello who was typing fast in his computer. There were a lot of images displayed in one of the screens, while others showed footage from the security cameras installed across the sewers just in case, and one for the news report.

"What did you find?" He asked.

"It seems that the piece of metal I took from the robot last night and the reports coincide, this is Tulio. It's often used with laser and X rays." Donnie explained, adjusting his glasses for a bit. "But one of its isotopes can be used as a source of energy." With one click pictures of the metal were displayed to his brother. "Apparently, the building assaulted last night held big amounts of Tulio and it was supposed to be used to improve the X rays of New York."

When Donnie stopped talking the news about the incident repeated the information to the turtles who paid small attention. April, their friend, was re-telling what happened, and it was obvious by the information given that the news didn't seem to have the full story, just bits and parts of it. During their silence as they listened to the news report, Raphael stopped his small session of training by himself and approached his brothers.

"And the monkey you detected?" Leo broke the silence.

"Even if what we found with the robot was a fake, there's no doubt that a monkey was at the crime scene. A mutated monkey." Just as his words left his mouth, Donatello showed to Leo footage from security cameras, different ones. Some were from last night, and others are during the day. The monkey had a big helmet on his head and wears a cape, but there's no doubt that it was mutated like them. "He goes by Mojo Jojo and he's a very big criminal from Townsville. The city it's located not too far away from New York City, on the south."

"He usually attacks the city with his inventions. Big robots, lasers and guns of every kind. He's not the only villain of Townsville but he's one of the few who attacks frequently the city." Donnie finished explaining.

"Great." Raph rolled his eyes, not very happy about this. "More bad guys to worry about."

"Not really." His brother interrupted him. "You see, in Townsville they already have vigilantes. Or, well, it's better to call them heroines."

"You mean the girls from last night?"

"Yes. They go by the name of Powerpuff—"

"The Powerpuff Girls?!"

This is when Mikey finally joined his brothers and looked very excited about the topic. He almost pushed Donatello off of his chair due to his recent excitement. But who can blame him? He was listening to them before despite the fact that it didn't look like it with Michelangelo eating pizza, chilling and playing the battery to pass the time. But once his brother said the name, and not even completely, his brain clicked and remembered every time he saw those three girls on TV, saving people every day.

That's when he realised that those were the girls from last night. How stupid he was for not realizing it sooner!

"Bros, we were face to face with the all mighty Powerpuff Girls, I can't believe it!" The youngest was grinning. "How did I not ask for an autograph?"

"Are they really that famous?" Leonardo asked.

"They're heroines and celebrities! They are in the news almost every day." And just when Mikey was about to give a long talk about the three superheroes to his big brother, Donatello made appear in various pictures and videos of the Powerpuff Girls on the screen. "Just look at them! Don't you think they're amazing?"

"They look like a bunch of little girls who shouldn't be messing around with danger," Raph said, looking very unimpressive to the pictures and videos.

"Oh come on, bro. They're awesome!"

In the rush to prove a point (which seemed kind of childing given the topic), Michelangelo pushed Donatello away from his computer, which annoyed Donnie, to take control of this matter.

"This is Blossom." Mikey began while showing the first picture, the redhead in pink. "She's the leader of the Powerpuff Girls, smart and responsible and all that jazz. Maybe you two could get along with her." He said while looking at Leo and Donnie for a moment. But to his comment, his brothers just shared a look between them because they've never seen Mikey this excited about something (or someone) before. "This is Bubbles." Now he showed the picture with the blonde girl in blue. "She's super nice, and sweet, and caring and is the cutest of all three."

For a moment all three brothers wondered if Mikey was looking at the picture of this Bubbles with awe, he even had a goofy smile and everything. They feared he might have puppy love for someone he doesn't even know personally, but they wouldn't get an answer to that (yet) as their little brothers moved on to the last girl. The dark-haired in green.

"And this is Buttercup, the muscle of the team and also the angriest one. I think you'll like her Raph." At this Raphael only raised an eyebrow, doubting his little brother. As if some little girl could even match him in strength. "All three have powers you can't even imagine. They can fly, they have super strength, Buttercup is still the strongest, they're super fast, have X-Ray vision, laser eyes and the list just keeps going. They're THAT awesome!"

As Mikey continued his fanboyism over three superheroines, Leo began to wonder about last night yet again. With this new information, things were starting to make sense... even if it's a little.

"So." He began. "It's safe to assume that those Powerpuff Girls were here last night chasing after their villain."

"But that monkey still came here. What do we do about that?" Raph asked.

"If he comes again, we'll stop him."

"What if the girls show up?" Donnie asked this time. And to that Leo had no straight answer.

Splinter had been staring at his sons from afar while drinking tea. He listened to everything, even Mikey being himself when talking about those three special girls. The master had an idea in mind and went to his sons.

"If you come across those girls, I believe it's best to join forces." The rat said to them, and the news made the youngest turtle get even more excited.

"Why?" Raph grunted. "We're fine on our own. We're a good team."

"Indeed you are, Raphael. You have become very strong and much more united since the last threat." Splinter smiled gently at him, looking straight at all his sons. "But now you're dealing with forces unknown to you, new dangers, and nobody knows how strong this enemy is or if he had allies. Joining forces with these... Powerpuff Girls... will be the best for New York. They know what they're dealing with."

Their father was right. He was usually right about a lot of things and this explanation about his position in the matter only made the turtles question themselves about what to do. Mikey wasn't, he was happy and jumping knowing that there's a small chance he'll get to greet personally three big names in the hero department Donnie and Raph stared at Leonardo after a moment of silence, waiting for his verdict as the leader.

After a while, Leo sighed and nodded slightly. "Alright. It's a deal, master."

And with that said his brothers nodded and Mikey was happier than before. He even hugged Leo because of it before going to the computer to watch the videos again.

"I hope we get to see them again. And if that happens I'll definitely ask for their autograph!"

"Shut up Mikey!"

The youngest received another hit on the head from Raphael but he didn't mind, too busy staring at the Powerpuff Girls on the computer and wishing... wishing to see them again.

So... what do you think?

Comments? Feedback?