AN: this cross-over is a cross-over… sort of. Because from a certain point of view, it isn't. You'll understand what I mean as you read the first chapter.

A POWERPUFF PROBLEM

Day One

SUNDAY

Really. How could a rabbit like him be meaner than that?

Mac doubted that somewhere in the world existed an imaginary friend as much hardworking as Mr. Herriman. Today he had just made three steps into the foyer that the gentleman hopped right into his path and literally smashed a written note into his hands. "I sure don't have time to tell all the necessary deeds through the megaphone system, so make yourself useful young master!", he had said with a commanding tone that didn't leave space for protests.

Easy for him to talk around, when he wasn't the one doing the hard work... And he couldn't simply say 'no', given the fact that his particular relation with Foster's was already a clear infringement of the rules.

…okay, to be honest it was because he was a little scared by the imaginary friend. But hey, everyone would be nervous with someone like Herriman around!

At that moment, Mac was walking through one of the dozens (or thousands) of hallways that filled the internal parts of the mansion. He had encountered and said hello to three imaginary friends during the walk, but apart from them he had been alone. There was no sign of Bloo or his other friends.

His patience might have thinned out by that moment, but thank goodness this time Mr. Herriman had asked for something actually in his range. He only needed to walk for thirty additional seconds before reaching his destination.

He stopped in front of the door and knocked on it, "Hey, Frankie? It's me, Mac."

"Come in!" came the answer right away, "I'm just relaxing myself for a moment."

Mac didn't want to make the young woman wait: he pushed the door open and got into Frankie's room. She was sitting in front of her personal computer, though as for now she was directly facing Mac. Her green sweatshirt lied abandoned on her bed.

"Don't tell me… Herriman has something to say about the fact I've been inactive for more than five minutes straight?"

"Maybe he doesn't know exactly about what you're doing now, but he must have felt it. Here, it's for you," Mac said before handing the note over. Frankie took the thing and, while she read over the extremely long number of requests, visibly frowned.

"Oh, man… that rabbit is going to make me lose it one day," she groaned.

"Well, he can't hear us, so I think you can rest for some extra minutes without him knowing you did…" Mac suggested. Frankie shook her head in disapprobation, "Thanks for the tip, but I've doubts about him not being able to hear us. When he wants, he can be full of surprises…"

That said, Frankie watched over the screen and grabbed the mouse, no doubt in order to turn the machine off.

Before she could do it, though, Mac glanced and the screen in curiosity and said, "What were you doing anyway?"

"Oh, nothing special Mac, though I don't know if you can be interested as well."

She moved sideward with the chair in order to let Mac watch was being displayed on the screen.

There were a number of pages opened on an internet browser, but the currently opened page was special in its theme.

It was a simple blog article featuring some new details and opinions about a future TV show that was going to air in a few months.

The new Powerpuff Girls series.

"Well, it isn't surprising, given how everyone in the house knows how much of a fan you are," Mac stated, losing part of his interest.

Frankie gave a quick look to the three colour pattern visible on her t-shirt. "Ha… That's true, but, you know, I'm not really looking forward to see the new show that much. It's basically all new, new voices, new style… everything, so we can't really say if this new series is going to be good or not."

Mac scoffed at the description, "Whatever it is, I'm not interested. It isn't my type of cartoon anyway…"

"Isn't it? If I know something about the Powerpuff Girls original series, it's that it had a high appeal to everyone, no matter the age or sex. I bet you watched some episodes here and there… didn't you?"

Mac would have attempted to rebut at once if it wasn't for the soul-reading look that Frankie fixed him with. He immediately blushed against his will and watched the other way around… "Uuuhhm… I may have watched some… but only like, ahem… less than ten episodes, I think!"

"Yeah, yeah, if that's what you say…" Frankie said, a visible smirk on her face.

"Oh, please don't tell Bloo! If he comes to know about it, I'm doomed!"

The redhead winked at the frightened eight year old boy while she put on her green sweatshirt, "Don't worry, I'm not that mean. It's going to be our little secret."

Mac sighed in relief at the reassurance. He couldn't really say if he could sustain the amount of times and ways the blue imaginary fried would make fun of him with that tiny fact.

With that settled, both Frankie and Mac left the woman's bedroom and the former raised up the paper: "So, what's the first thing you have for me Her-…"

"MISS FRANCES!"

The voice of the imaginary friend was impossible not to be recognized, even though it was a bit distorted by the filters of the megaphones.

"Your assistance is asked at the foyer, right away! Make your travel down here fast!"

Frankie glared at nothing in particular while she stomped towards the nearest receiver and roughly answered, "COOOMING!"

He put the device back on the wall and sighed, "Sheesh, he really wants to see me work with his own eyes…"

Mac wasn't of the same idea. "I dunno, Frankie. He seemed… worried. Maybe there is something big happening down on the ground floor."

"Can't be any worse than the tasks he had just assigned me to do with this piece of paper. I believe I saw your friends in their room last time, anyway. I must go now, Mac, see you later!"

"Hey, can I come with you? I don't know, but I really feel something new is going on…"

"Suit yourself, Mac," Frankie said before beginning to walk towards the nearest stairs. The boy followed her as he wondered what could have made Mr. Herriman nervous. He rarely lost control of his nerves and he was usually calm until someone (with the someone being Bloo most of the times) broke the rules more than one time.

The two of them moved without running but still at a quick pace. They weren't really far from the foyer, in any case… therefore, it was only five minutes after their departure that they began to hear the voices.

"Hey, do you hear someone speaking?" Mac asked.

"More than one I'd say. Must be a group of new imaginary friends and the rabbit wants me to show them the house," Frankie answered.

The voices gained in number as they approached the entrance, and so did the overall loudness.

Both Frankie and Mac raised up their speed. That definitely explained why Herriman was worried. No doubt he was having trouble now keeping all the new imaginary friends at ease.

The problem was, the friends were a lot. But a real big lot of them. When they reached sight of the upper platform of the foyer, the noise was easily comparable to the combined sounds of a disco, a plane taking off and a full active construction site.

"Oh boy, this ain't good…" Frankie shuddered as he and Mac finally reached the platform and began descending the first series of stairs.

What they saw, however, froze them midway.

Yes, the room was completely full of imaginary friends, alright, and it was hard not to see Herriman as he shouted orders around, phrases that went unheard for a half and unlistened for the other. What they were not expecting at all, though, was the kind of imaginary friends that filled the chamber.

Powerpuff Girls themed friends. Everywhere.

Frankie had a precise idea about the new show… but that didn't mean than anyone in the world was of the same idea. The result of the worldwide hype was right before her.

"Ohh… dang."

Mac and Frankie remained motionless for ten seconds straight, and only the appearance of an imaginary friend in front of them broke their trance.

"Hello!" Blossom said politely. Or, to be more precise, a Blossomsaid.

Frankie tried her best to force her lips to twirl into a smile. The resulting expression was closer to a grimace, but Frankie had not the time to refine it.

"Uuhh… Hello.. Uhm, sorry, but we really have to go and speak with Mr. Herriman now…" she spluttered, still half stunned.

"Oh really? Can I go with…?"

The Blossom crossed her hands in annoyance when Frankie left her alone without waiting for her to finish her speech, with Mac right behind her. She would have had to fill in a public complain about the workers in this house…

"This is bad! This is bad!" Frankie quickly said to herself, watching around only to find problems that needed her attention.

"There's too much of them! We need to organize them somehow or…" Mac tried to suggest, but he inadvertently bumped into an imaginary friend and lost sight of the young woman.

Fuzzy Lumpkins immediately stopped his arguing with the three Buttercups who were making fun of him and glared at the kid, "Hey, watch where're ya going, ya fool!"

"Sorry!" Mac apologized before trying to put as much space as possible between him and the hillbilly imaginary friend. But he ended up encountering another friend in the same way he did with the Fuzzy one. Possibly putting himself in an even worse situation.

"What are you trying to do, loser?" Brick snarled before grabbing Mac and raising him from the ground with surprising strength.

Two additional rowdyruff imaginary friends circled the kid, effectively blocking every escape route.

"What do we have here, a scared little kid?" Butch joked, noticing how Mac was beginning to get frightened.

"I say he wants to be beaten up!" Boomer said excitedly before being hit by Brick's free hand.

"Of course he wants to be beaten up, idiot... Let's see how much resistant you are, kiddo," Brick informed before launching a punch into Mac's face.

Mac was sure he was doomed, but the fist stopped millimetres away from his nose, at the same time as a 'HEY!' was heard.

Unfortunately, it was Brick who said it. At least, another Brick.

"That kiddo is ours!" Brick Two shouted in anger.

"What? I don't seem to remember you've grabbed him first!" Brick One retorted.

"We've been following him for ages!" Boomer Two protested, "You ain't just getting him without a fight!"

"Jeez, Boomer, that guy is as obnoxious as you…" Butch One chuckled, gaining an angry glare from Boomer One.

"So, hand down the kid, or else!" Butch Two growled, already ready for the upcoming fight.

"Come and get him then!" Brick One challenged. Instantly, Mac was left behind and he simply stood unmoved and astonished as he watched the six Rowdyruff Boys fight each other.

Not as superheroes, mind you, just as five years old kids (or imaginary friends as they were) would do.

"You're all right?" a voice said as someone put a hand on his shoulder.

"I'm okay, thanks…" Mac said before turning in hope to find a known face. Unfortunately, in front of him he found no other than Professor Utonium himself.

"Those rascals there are always up to something, try to avoid them from now on, okay?"

"Uhhm… yeah?" Mac mechanically answered, completely at the mercy of the succeeding events.

"Good boy!" Professor Utonium said, though his lips did not open at all.

In fact, it was a second Professor Utonium who said it, and the new imaginary friend right away appeared at the left side of the first professor.

"You are a fine example of braveness. Keep it up!" Professor Utonium Two said smiling.

"I cannot help but agree, colleague!" Professor Utonium One replied, "Say, have you perhaps some knowledge in nanoinformatics?"

"Why, of course! I have lots of experience in that field! How can I help you?"

"Well, before moving into this place, I've been working on this new project mine, for which I based myself on…"

Mac slowly walked away from the two professors, keeping a fake smile on his face.

They're all crazy here! I need to find Frankie!, he thought as he nervously gazed around trying to locate the redhead. He sprinted towards what appeared to be a glint of red hair but stopped when he realized it was another imaginary friend, a Miss Bellum this time. The Blossoms running around weren't of help either for his search.

Mac would have considered panicking if it weren't for the figure that put itself in front of him.

"YOU!"

Mac kept silent and a shocked face as he stared at the imaginary friend in front of him. This was an example he had already seen once at Foster's… but this one was far more faithful to the source material.

"I've had it of this chaos!" Mojo Jojo uttered in annoyance, "if I have to live in this home from hereon, that is to say, to begin to pass my days inside this mansion, I require the environment needed for a being of superior intelligence as me!"

The imaginary friend put a finger right into Mac's chest, "I have a feeling you may have a link to the masters of this foster home, thus I order you to bring me to the heads to who I will make my due requests!"

"I… I cannot seem to find them…" Mac babbled, sweat coming down his cheeks.

"WHAT?!" the Mojo Jojo imaginary friend shouted, his eyes getting reddish, "I surely hope you have a good explanation for that answer, pathetic brat! Or there may be consequences towards your person! Consequences that might consist in…"

Mac shook his head and didn't let the friend finish his speech (he didn't look forward to it, anyway): "I'm trying to find them as well, you know! But there's just too much people!"

Instead of getting angrier, the Mojo Jojo watched Mac in thought for some seconds… before saying, "Do you have an image of the head of this home, so that you can give a proper description to anyone who would request it?"

"Uhh… I do?" Mac hesitantly answered. He wasn't liking where this was going.

But for once his expectations were mistaken. The imaginary friend took out what appeared to be a sub telescope made out of tin cans.

"Umph! You are lucky, young boy, because I, Mojo Jojo, have in my hands the instrument that will led us both to our goal! Whatever you goal is…"

Mac sighed in relief. Perhaps there was a solution to this madness.

Frankie left Herriman behind herself, as the rabbit had just passed out some seconds before, and put an hand on her forehead. The friends around her didn't seem to have any intention to get quieter or at least calmer.

She saw someone making its way towards her, and she was surprised to see Mac, who she had lost in the maze, moving towards her between puffs, villains and other characters alike, followed by the nth themed imaginary friend.

"Frankie! I cannot take it anymore!" Mac moaned as he regained his breath, "There's no way we can keep track of all these imaginary friends!"

"This situation is unbearable!" the friend at his side added, the purple cape flying around, "And it is your duty to solve it at any cost, as I, Mojo Jojo, won't tolerate any more of this distracting mess!"

"I KNOW!" Frankie shouted back, silencing both Mac and the Mojo Jojo imaginary friend, "I just… *gasp*…"

She left herself fall to the ground. Mac went instantly to her side, while Mojo Jojo stared at them dumbfounded.

"Frankie! You're all right?" Mac asked worriedly.

"I'm fine, I'm fine," Frankie reassured, "It's just that…"

She sighed again before watching the ceiling above her, the noises around barely audible for just an instant.

This is going to be a long week, isn't it?

AN: Yeah, this is based on that small Mojo Jojo cameo in the pilot episode of Foster's, and various cameos and references in other episodes that suggested PPG to be a TV show in the Foster's world. I thought it could give a good premise for a humour story, and with the reboot coming in I had the perfect excuse to make it happen as well.

Update: Remember, the new series which is talked about in this story is left to your interpretation as to what it is, and it's not necessarily the same reboot that aired in 2016. On the other hand, the bulk of this fanfic is still based on the original Powerpuff Girls series from 1998 and there are no references to the above-mentioned reboot.