This story is based on the online Phineas and Ferb game "The Dimension of Doooom!". I would have liked to write a thematic prequel for the similar "Transport-inators of Doooom!", but that game already has a rather self-explanatory story with little room for extra narrative. I got this idea when I realized that it would be really cool to have a multiplayer version of the game where each player could play as one of the four playable characters and work together to beat the game, as the main storyline indicates that it's really the four characters working together as a team rather than just one of them at a time.

The story is intended to take place after Across the 2nd Dimension. The first few chapters will cover some background events before we get to the part where the game's story starts.

This story will use events and dialogue from the game, but I don't own "The Dimension of Doooom!" or Phineas and Ferb as a whole.

Everything seemed to be fine in the Second Dimension. Doofenshmirtz had been arrested and the citizens of Danville were gradually rebuilding their hometown, tearing down or replacing the many conspicuous reminders of Doofenshmirtz's reign. There was a lot of work to do in order to restore the place to its former state, but things were finally returning to normal. Everywhere people were rediscovering activities and feelings they hadn't experienced in years - for many children and teens, it was discovering some of these things, for they had either never experienced them or had long since forgotten.

At first, Doofenshmirtz was kept under constant surveillance, but eventually it was realized that he was essentially harmless. In fact, he thoroughly thought he deserved his punishment, and never showed any signs of resistance. Not to mention that it was frankly rather boring for even the most apathetic prison guards to watch a now-innocuous man fondle his long-lost toy train 24/7. Even watching the cleaning robots that were sent into the cells every other day to dust things up was more interesting. Although no official orders were ever given, the hours spent watching the former dictator slowly dwindled until he was treated almost like any other inmate, with only simple periodic check ins to make sure he was not up to anything suspicious. Solely his high-security prison cell remained a reminder of how much trouble he had once been.

Perhaps any other evil dictator in this suddenly favorable position would instantly reveal that it had been an act all along and arrange a prison break, ready to exact revenge on the heroes who had foiled him, but not Dr. Heinz Doofenshmirtz of the Second Dimension. He had been sincere when he claimed that he had realized the error of his ways.

Unfortunately, as easy as it had been to deprive Doofenshmirtz of his evil, no one in the Second Dimension knew that it had been just as easy to spark it initially. And as luck would have it, there came a day, not long after constant surveillance of Doofenshmirtz was dropped, when his toy train Choo-Choo disappeared once more.

In the instant when Doofenshmirtz grasped what had happened, everything inside him changed. He no longer thought ill of his malicious deeds upon the Tri-State Area. He was positively proud of them, and was ashamed that he had sat tight in his cell without scheming for so long. He had reverted back to being an evil scientist. And if he had his way, an evil dictator - again.

Now he would arrange a prison break and exact revenge on the heroes who had foiled him.

Candace Flynn sat up underneath the newly planted tree in the backyard. Most of the time it was her brothers who had taken to sitting there these days, but they were out somewhere doing one of their big projects, something they had picked up from their First Dimension counterparts, who had wound up in this dimension some time ago on the day that Doofenshmirtz had finally been busted.

Having a normal life was... strange. Candace had almost had to learn how to be normal again. She had spent almost her entire life up to now fighting in and being the leader of the Resistance, and now that Doofenshmirtz had been overthrown, she found that she had so little and so much to do. So little, because the job of the Resistance was done. Certainly the higher-ranking Resistance members still sometimes cooperated with the O.W.C.A. and other government institutions to keep Doofenshmirtz under close watch, but as this procedure slackened the Resistance found they were needed less and less. So much, because now there was so much more to life than fighting Doofenshmirtz's tyranny. It was hard to take in all at once.

"No, no, no, no, no..." someone was muttering in distress as they approached the backyard.

Candace knew that voice. That Indian accent was unmistakable. Sure enough, the gate to the backyard swung open to reveal Baljeet.

"Oh," Baljeet opened his eyes wide, clearly frantic. "Good thing you are here, Sir. Is there anyone else around?" Baljeet - or Dr. Baljeet, as nearly all his allies had known him - had been the head of intelligence in the Resistance. While he had almost never gone out into the field himself, his knowledge and calculations had served them well time and time again. Having a rather submissive personality, he was still unaccustomed to addressing Candace as anything other than "Sir".

"No one but me," Candace confirmed. "What's wrong, Baljeet?"

"Good, good," Baljeet stammered. "I-I thought I had better inform you first. Did not want anyone t-to panic. It is, it is horrible!" During his last sentence Baljeet rose his shrill voice to nearly a scream, clearly on the verge of panic himself.

"Calm down, Baljeet," Candace said with the air of authority she had always used during her time in the Resistance. She stood up and looked around, hoping that they hadn't drawn any unwanted attention. "Baljeet, if this is better taken somewhere else, we can go inside."

"No, no, I'm fine," said Baljeet, struggling to lower his voice to a whisper. "It's just that, just that I'm not!"

"Baljeet, just spit it out already!" Candace said sharply. It had been years since she had last seen Baljeet this panicked, and that was when he had first been recruited. He had eventually settled into a calmer and more composed demeanor.

"Doofenshmirtz is gone," Baljeet whispered, just managing to control himself for a few moments. "And it's all my fault!" At this, his voice rose to a scream again.

A flock of birds rose up out of the trees across the street and flew out of sight.

It was just another normal day in the First Dimension. Or at least, almost normal.

"Isn't it strange, Ferb, that Perry hasn't wandered off for the past few days?" Phineas asked his green-haired brother. Well, technically his stepbrother, but they were too good of friends to really care about that.

Ferb just stared. He talked a little more with Phineas than he usually did with others, but even then they only rarely had a real spoken conversation. Phineas had long ago learned to read Ferb's staring and blinking with ease, and in any case they were often thinking the same thoughts anyway.

"It's great that he's been able to spend time with us these days," Phineas continued. "But it just isn't the same to go for days without saying... Hey, where's Perry?"

Their pet platypus Perry had vanished from where he had been lying just moments ago.

It was a normal day again.

Standing on his hind legs with his secret agent fedora on his head, Perry the Platypus hid himself behind a fence post, with slid open to reveal a hollow interior. Perry fell backwards into the hollow space to slide down a tube and land in his hideout where he was given his missions. It had been strange that there had been no missions for the past few days when his nemesis normally had daily projects. While having a few days off was nice, Perry had been getting suspicious.

"Good morning, Agent P," Major Monogram addressed him from the large screen in front of Perry's seat. "As you know, Doofenshmirtz has shown no sign of activity recently, and now we know why. Earlier this morning we finally received evidence that he was up to something, just as we suspected."

"Just as I suspected," Carl the intern corrected from somewhere beyond what was shown on the screen.

"Enough, Carl," Monogram rebuked. "My guess was as good as yours. Ahem. As I was saying, Agent P, we received knowledge of this." An image appeared on the screen, showing a piece of torn fabric. It was mostly lime green, but there was a bit of brown in the corner that showed it had clearly been part of some design.

"We've managed to reconstruct the likely original appearance of this clue," Monogram continued. "And have determined that it's part of a design that looked like this." Another, larger image appeared on the screen and attached itself to the image of the fabric. It was a picture of a blueberry muffin on a lime green background.

"As you can see, Agent P, this is a clear indication that-" Monogram broke off. "Isn't that image a little scrambled, Carl?"

"Oops. Sorry, Sir," came Carl's voice. The image then rearranged itself to an image of Doofenshmirtz's face on a lime green background.

"So there you have it, Agent P," Monogram said. "Doofenshmirtz has been creating curtains with his face on them. Your job is to find out what he's up to and put a stop to it."

Perry saluted the Major, then climbed into his hovercraft and set off for Doofenshmirtz Evil Incorporated.