Chapter 1: One Isabella, two Isa… wait, What?

It was already 12 in the afternoon when the brothers of invention finished the day's project. In place of all the junk that used to be scattered through the backyard that morning, there was now a machine twice their height. It had a ray gun mounted on the very top and a circular base.

"We did it Ferb," the red haired boy stated. "With this we can finally move through dimensions."

"If the matter accelerator doesn't scramble our particles first," Ferb said.

"Don't be a killjoy Ferb," Phineas frowned and beamed a smile again. "Nothing ever goes wrong with our projects. I mean besides mysteriously disappearing that is. And talking about mysterious disappearances, where's Perry?"

Talking about Perry, our favorite semi-aquatic mammal was once again sneaking away from his boys. Sliding down the pipe hidden behind a secret door found on a wall, he landed safely on his seat inside his secret base. Greeting Sgt. Monogram on the screen.

"Good Day, Agent P," Sgt. Monogram greeted. "Dr. Doofenshmirtz won't be our priority today. He seems to be busy with something back in his hometown so he won't be bothering us for a little while." Perry breath a sigh of relief as he wiped imaginary swear off his furry head. "But there seems to be a suspicious group in downtown Danville doing something we are yet to identify. It's your job to find out what they're up to and if it's evil, stop it." Perry nodded. "Good luck Agent P." With those parting words Perry pressed a button, sending him through a hole on the ceiling and into the sky where a jet plane was waiting for him.

Perry pressed the ignition button and was immediately on his way to downtown. The scene changed from that of a cheerful metropolis into that of a gloomy slum. The houses were all aging with the windows bare, fire lit on trashcans, and homeless people littered through the dark corners of the streets. If you were oblivious to this part of Danville, then you'll definitely think you're in a completely different place.

After a few minutes of flying around downtown, Perry noticed a few well-dressed men walking in and out of an abandoned building. Landing on the opposite building, Perry took out his binoculars and started observing the suspicious individuals.

Perry noticed three things. First, there were only two of them. They would come in and out of the building, taking a box from the truck parked up front with them every time they came out. Second, It was hard to identify the content of the boxes. There weren't any label or print on the boxes to identify what they had inside and it didn't look like the men had any open ones in the truck. And lastly, they were clearly up to no-good. No one in their clear mind would think these people were in downtown to set up a business, and to have three really well dressed macho men coming in and out of an abandoned building? That just spells trouble, and Agent P. wasn't going to let that happen.

Waiting for both to walk inside, Perry took off his hat and jumped off the roof once the coast was clear. Walking towards the door like he was a normal platypus, one of the thugs came out.

"What the," he shouted, stopping right in front of the door. "Hey! hey, Look!"

"What is it Marco," the older looking one asked, walking right behind Marco.

"Look Jeff, it's a Platypus," Marco stated the obvious, pointing at our hero.

"I can see that," Jeff sighed.

"Aren't you a little bit surprised to see one in the middle of the city? Downtown even. Maybe it's one of those animal spies we keep hearing about."

"That's impossible numbskull." Jeff slapped the back of Marco's head then went and pointed at our friend. "It's a platypus, they don't do much." Perry chattered. "And it might have just escaped from a pet store or something. Anyway, just get back to work. The boss called and he said he's right on his way. So we better hurry this up before we get killed."

"Okay," Marco replied, picking up another box. He walked up the door before stopping in front of Perry. "You better ran away now little guy. You don't want to stay here when the boss come, he's really evil."

"MARCO!"

"Anyway, I better go," Marco said and ran into the building.

Perry chattered once more, baffled by the way the two acted. But it didn't take long before he regained his composure and walked into the building, melding into the shadows and passing through the corridors of the abandoned place. But we're getting ahead of ourselves, so why don't we turn back a few minutes and look at the things unfolding in the Flynn-Fletcher backyard.

While Perry was getting brief in his base, Isabella came over and was already chatting it off with the brothers. She was wearing a violet t-shirt with blue jeans that cuts of below her knee. She also had her hair tied into a ponytail.

"Hi Phineas," Isabella greeted her crush. You would have thought Phineas has already realized the poor girl's feelings for him but it seems like time hasn't changed that much since the boy genius was still as oblivious as ever. "Whatcha doing?"

"Oh Isabella." Phineas greeted her back with a smile. "You just came in time to see us test our dimensional transporter."

"Dimensional transporter," Isabella asked. "Isn't that a little bit too dangerous?"

"What's with you and Ferb today," Phineas frowned. "When did our experiment ever go wrong?"

"It's not like that Phineas," Isabella reassured the boy. "Something just doesn't feel right about that thing." The green haired boy simply nodded to this.

"Well I say let's test it our first," Phineas suggested. "Nothing bad about testing it our right? If it doesn't work then we'll disassemble it and maybe build something else in the afternoon."

Ferb and Isabella could only nod at this, but what Isabella said was true. Both couldn't explain it but something about that machine just feels wrong. Ferb felt it the moment they finished it and Isabella felt it the first time she heard its name. Both knew something would definitely go wrong.

Phineas walked towards the control panel behind the machine and asked the two to step under the ray gun. After pressing a few buttons, Phineas ran under onto the base as well while the ray gun took its time charging on top of them. Phineas' eyes beamed with excitement while his two companions only felt more and more anxious as the ray gun charged.

The machine has reached the required energy output and was now preparing to fire. Phineas was as prepared as he could be. He closed his eyes waiting for the ray to hit them and send them flying through the dimensions. But the awaited zap never came. Each passing second only further lowered the boy's enthusiasm. Opening his eyes, Phineas was a little disappointed as he looked at the ray gun above him and all it did was emit smoke.

"That's weird." Phineas scratched the back of his head. "I swore all the calculations we're correct." Phineas finished, walking off the device along with his friends. But once of, the most unexpected thing happened, a large beam shot out from the gun and hits the base of the device, creating a lot of smoke.

"Phineas," Isabella shouted, coughing from behind the thick layer of smoke.

"I'm right hear Isabella," Phineas replied. "Is everyone alright?"

Some of the smoke cleared, allowing the three to get their bearing. None of them looked hurt and except for the large quantity of smoke floating over the device nothing seemed to have been damage. Phineas looked around after asking his question and after getting two nods turned his attention back at the machine.

The smoke was slowly clearing around the transporter and there was not a scratch on it. All of the parts were there but there was one small detail that wasn't there before the explosion. A girl around the same age as Isabella, wait scratch that. Looking at her a lot closer. It was Isabella, another Isabella in fact.

"Whe- where am I," the disoriented second Isabella asked, coughing a few times. But none of the three gave her a reply. How could they? They were all too shocked to even move. This wasn't supposed to happen. Phineas and Ferb looked shock because it's the first time anything like this happened with one of their inventions. Isabella on the other hand looked shock because she was staring at herself. Another her that supposedly came from another dimension. It seems like things aren't playing out for the Phineas and Ferb of this dimension, so what about the ones of the second dimension?

The rebel headquarters were in an uproar. The alarms were set off and the fireside girls were running all over the place. Let's visit the strategy room. Maybe we'll get some answer from there.

"What do you mean she escaped," Candace shouted at one of the fireside girls, slamming his hands onto the table.

"There was a huge hole in her cell when we checked ma'am," Ginger saluted, flinching when the older Flynn slammed the table.

"We placed her in maximum security and she was still able to escape. Get everyone available into the search and don't let any nook or cranny unchecked. That woman can't be allowed to escape."

The trebling girl gave her officer a salute and dashed out of the room, leaving the raging woman with his stepbrother. Ferb simply stared at the space the fireside girl stood. He couldn't believe what he just heard. The world's most dangerous criminal was out there once again ready to plan their demise.

Hi guys, thank you for those who has subscribed and will subscribed to this story. It's been a while since I wrote something new so, the writings a little… hehehe… Anyway, until next time.