This is a collab that Monstarzgirl and I worked on a little while ago(She and I each took turns writing parts of the story) which is a continuation of her own Powerpuff Girls series starring her OC, Rebecca Utonium, the professor's niece. Please enjoy!(BTW Monstarzgirl, thank you very much for working on this story with me. I've always loved your stories and had a lot of fun writing this story with you; I look forward to us writing more in the future.)

(BTW, please only leave normal reviews relating to the story.)

Narrator: The city of Townsville and it's a nice, peaceful, and quiet Saturday today.

Suddenly, a loud rattling is heard from the Utonium Chateau.

Narrator: "Huh? W-what's going on?"

From on top of the house, a large antenna suddenly begins transmitting beams of energy. As the waves emanate through the town, several buildings and residences rattle about wildly before suddenly stopping; an abrupt crash is then heard. This continues for several hours before grinding to a halt. From inside the house, Professor Utonium gasps, "Oh...oh no...what have I done?"

In Rebecca's room, Rebecca is in her bed and curled under the covers. The Professor's voice can be heard saying, "Becca! Becca!" Groaning and still having the sheets over her head, Rebecca mumbled, "Uncle John, it's Saturday..." In an instant, the covers get pulled off and in place of Rebecca was Mojo Jojo!

However, Rebecca's voice is heard and she said, "Aw, c'mon! Can't I just have five more min..." Looking down by her bedside, she looked to see Buttercup. Buttercup spoke in the Professor's voice, "Rebecca, whatever you do, remain calm." Rebecca blinked her eyes in shock and said, "U-U-U-U-U-U-Uncle John? Y-You're Buttercup!"

Professor Utonium said, "Not quite, sweetie. I'm in her body. You're also in Mojo's body."

Rebecca squeaked, "What?!" Looking at her hands, she sees them green and her arms covered in black fur. Reaching her hand up to her head and feeling a familiar brain helmet that looks like a turban, Rebecca softly said, "What the..." Looking at her feet, she notices that her feet are green and her toes are shaped differently. Touching her face and feeling black fur on her cheeks, Rebecca immediately jumps out of bed and looks into the mirror on her dresser. Rebecca looked to see her face green and sharp fangs when she smiled, along with her eyes being a dark brown with pink eye whites. She only wore a pair of navy blue boxer shorts and no shirt, showing off a masculine chest with defined muscles on the pectorals and abdomen. Seeing that her body isn't feminine and is now animal-like, Rebecca breathed heavily and gave the loudest scream, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH!"

Hearing the commotion, the two hear pattering and looked in the doorway to see Blossom. Rebecca asked, "Blossom, is that you?" However, Blossom gave a bark and started panting. Rebecca asked, "Roxi? Uncle John, could you please tell me what the heck is going on here?"

Professor Utonium said, "I'll explain once we get to the lab. Oh, and I think you might want to call your boyfriend to tell him to come over."

Rebecca guessed, "He might be in my body? Oh, boy." Grabbing her phone, Rebecca began to call her boyfriend Mojo Jojo. Over at the observatory, few rays of sunlight came into the bedroom where Mojo lays asleep. Waking up and stretching himself, Mojo goes into the bathroom to wake up a bit more. Mojo washed his face and grabbed a towel to dry himself, but he looked in the mirror and looked to see himself as a female teen with wavy brown hair that is long, fair skin with rosy cheeks, light brown eyes, and wearing a baby blue chemise.

Mojo touched the hair and screamed, "HOLY MOTHER OF EDISON! WHAT HAPPENED TO ME?!" One by one, Mojo whimpered as he looked to see his fingernails and toenails painted a lavender color with sparkles, fair skin without any fur, and felt his body being slender with a few curves, "These nails aren't mine! Even the hands and feet aren't mine at all! The butt's not mine! How did this happen?!" Hearing the phone ringing, Mojo dashed over to grab the phone and answered, "H-Hello?"

"Hello, Mojo Dear," Rebecca replies with much concern to her voice. "I apologize for bothering you at this hour, but I'd like you to come to Uncle John's lab right away. We seem to have, uhm...a situation."

Mojo said, "Yes, I know, sweetie. We both swapped bodies! I don't know how to show up to your uncle's house! I'm only wearing a chemise and a pair of feminine underwear! Do you think you can bring some clothes for me to wear?"

At the Utonium house, Rebecca held the phone and searched through her drawers saying, "Yeah, that wouldn't be a problem." Pulling out a bra, a black t-shirt with The Phantom of the Opera words shown with the white mask and red rose, a pair of dark blue jeans, and a pair of brown sandals, Rebecca said, "Okay, I got out some clothes already. Speaking of which, I might need to wear your clothes and I'm only wearing your boxers. Oh, boy. This all just sounds weird right now."

Mojo flushed and moved some hair out of his face, "Yes, I can tell. You have a brain helmet on, correct?"

Rebecca said, "Uh-huh, and you might need to bring Foxy with you."

"Certainly, Sweetie." Mojo obliges. He then goes to find Foxy, upon Bubbles scampers up to him, panting and yipping. A blank look crosses Mojo's face. "Foxy? Oh my...this will be interesting, to say the least."