Credit belongs to Light1121 for writing this.

Lincoln and Lucy were hanging out at the Powerpuff Girls' house today, reading comics and watching TV. It was a bit of a surprise for Lincoln when he heard that the girls had a mother, who was an astronaut of all people. He always heard from others that they were...you know...grown in a lab which was only a myth.But, he was there to comfort them, having heard about their mother's disappearance. They were getting better, but now he was curious.

"So...is there anyone else about your family I should know about?" He asked.

Blossom, peaking up from her book, was the first to answer. "To be honest, it's hard to say. The Professor doesn't really talk about his side of the family as much."

"Although, there was a theory that he may have been the descendant of some great samurai or whatever," Buttercup added while using a punching bag.

"Aside from that, we really don't know." Bubbles finished while doing a painting.

That didn't leave much of an explanation, but now Lincoln was curious about the whole samurai thing. Eh. Story for another.

"One thing we know's for sure, though, is that some have tried to make themselves part of the family," said Buttercup. "And it never ends well."

The other two sisters knew what she was talking about, and they shuttered in anticipation because of it. Lincoln was not even gonna ask, considering it seemed like another sore subject. Lucy decided to speak up to try and avoid the awkwardness of silence between all of them.

"So...Lincoln...has Dexter helped you with any of the equipment for your...superhero career?"

"Oh, yeah." He said. "He's working on getting everything functional and making modifications to his lab so that I have a bit of a lair. It's pretty cool, to be honest."

"Cool." Lucy replied. A part of her was wondering if she could get in on the action. After that crazy lady from Aunt Murtle's past tried to kill her, she wanted to learn how to defend herself.

"How come we never had a lair?" Buttercup asked, to which her sisters answered, "We have the lab."

"And a van one time."

"And we're not like those other so-called heroes who were just...super jerks."

"I mean...we tried to be at one point."

"...Yeah, let's never bring that up again." None of them wanted to be reminded of their solo/dress-up/hero phase. It was a disaster.

Lincoln then said "Well, Dexter doesn't mind if you girls come and visit, especially since..." He gestures to Blossom, who Buttercup and Bubbles snickered, and Blossom pouted, trying to hide a blush. Then Lincoln continued "And, he says he's developing crime scanning equipment to make arrests and busts easier since he said all you guys use was that... toy phone?"

He gestures to PPG Hotline, looking cute as ever, though a little...well-warn with some paint chipping. But Bubbles took offense to that she flies over to their iconic phone.

"Hey! This phone has never failed us! Whenever there's a crisis, the Mayor phones us directly and thoroughly explains the situation without fail!"

And, as if right on cue, the Hotline's nose started blinking with the ringing going on and Bubbles picked it up not even a second later.

"Hello? ...Again?! ...And she's coming here? Oh no..."

Putting the phone down, she faces her sisters and friends with a serious expression.

"Sedusa's escaped...right when she was going to go on parol. The Mayor thinks she might be on her way here."

"You gotta be kidding me." Buttercup muttered.

"Sedusa? As in that lady with that crazy hair?" Lincoln asked as she and Lucy perked up.

"She's also the one who impersonated Ms. Bellum, seduced our dad, tried to be our mother figure of all people, and nearly destroyed Townsville, like seven times." Blossom listed, not being a fan of the lady.

"And if she's coming here, that means she's coming after the Professor."

Lincoln thought about that before saying "Okay. We may have plenty of time to work with before she arrives. So maybe, we can come up with some sort of defensive plans-"

But, just as it was coming along, an explosion was heard, and the floor rumbled underneath their feet, causing them to fall.

"Ow. What was that?"

"It came from the lab!" Buttercup yelled out as they all headed downstairs to see that the lab indeed got smoked, with a big giant hole in the wall, and a note, which Bubbles quickly snatched and read out loud.

"It just says 'come to the docks'." She said, with her sisters looking angry that their father was in danger from the woman they despise the most again. Seeing where this was going, Lincoln activated his Falcon watch and quickly turned into the Blue Falcon, along with summoning the Falconcar as they quickly made their way through the suddenly darkened skies of Townsville before arriving at the docks.

Professor Utonium's found himself in these sorts of situations before, but this is different. Sedusa wasn't acting like herself, pacing the floor, actually looking impatient, anxious even to see the girls again, even after all their encounters from before. Something has her spooked, and if she is worried, the Professor thought he should also be worried.

"I don't understand why this is necessary." He said. "Why am I here? What do you want this time, Sedusa?"

The female looked peeved at the Professor asking her that as she walked up to him with a scowl and said "You really don't remember. Do you Alexander?"

She was calling him by his first name... Nobody knew him by his first name for a long time. But if she knew...

"Well, I remember...everything now. Who we were before, what happened to me...But I see they got to you as well."

Something was knocking on the back of Utonium's head. Something that was trying to click, but nothing came up. What was she talking about? How did she know him? All questions may have to wait as Falconcar and the Powerpuff Girl suddenly appeared before them, looking ready to beat the conditioner out of Sedusa.

"Alright, hairy lady!" Buttercup growled. "Let go of our dad, or we'll make sure you'll go permanently bald!" She was really itching to just rip Sedusa's hair right off her scalp.

"Hold on!" Sedusa yelled, holding her hand out to them. "I'm not here to fight, I just needed to get your attention."

"Let go of the Professor." ordered the Blue Falcon. "You're in no position to negotiate."

Sedusa took one look at the kid and scoffed. "So, you're the new boy, huh? Cute..." But much to their surprise...she actually complied and let the Professor out of his restraints. "And did you really think I would so far as to harm the man I think of the most? He means more to me than you think."

"You're only saying that because of what you tried to do to him before!" Blossom yelled out. "We're letting you brainwash you again!"

"Hmph...you never at all wondered...how my powers came to be?" She asked, getting the kids confused. "He's as much responsible for my creation as he is yours. He's like a brother to me. Although a lot has happened to his head, I don't think he remembers much."

"Look, you're not making any sense. Can you stop with the cryptic stuff?" Buttercup asked.

And that is when the lady came clean "I escaped, just on my way to parole, to warn you all...they were planning to kill me when my memory came back...and I learned what they were up to."

"Who's they?" asked Bubbles.

"The people who want this city, no matter the cost. One in particular is looking to make himself...the sworn enemy to the mantle...that that boy has dawned." She points to Lincoln as the Blue Falcon, who knew there were a number of enemies that the Blue Falcon had made in the past. But exactly is it that Sedusa would be referring to.

"We have a common enemy. You'd be smart to hear me out."

"...Stand down, guys." Blue Falcon said, surprise the PPG.

"But-"

"She's already said that she won't hurt the professor, and she has information that concerns me." And with that you're a little short for a superhero, aren't you?"

"Ha-ha. Let's talk."

Meanwhile, with an isolated laboratory, a scientist was working out something outside the work of Morbuck's Enterprises. Princess Morbuck's family company usually just does venture capital to start or absorb new businesses. They were looking to make Crown Industries one of its subsidiaries in order to get a lot of money out of it but after Dexter was named the heir, that wasn't gonna happen anytime soon. Whatever businesses they were involved in, whether it was industrial, financial, or scientific, they left to their PR group to settle so that they could be completely involved.

But that also means they have no idea what's happening right under their noses.

As of this moment, the scientist was working on a serum that would affect certain parts of the body and the mind. An age-old experiment in an attempt to physically, mentally, and even spiritually, separate good from evil within oneself. The effects, more often than not, are disastrous, leading to the birth of a monster. And that monster has named himself the greatest enemy that the Blue Falcon has ever faced...

"Soon...very soon...Mr. Hyde...shall rise again."

He takes a vile of a glowing green serum...and injects it into himself.