Phineas and Ferb and it's theme songdo not belong to me. Phineas and Ferb belongs to Dan Povenmire and Jeff "Swampy" Marsh, and I'm PRETTY sure the theme song belongs to Bowling for Soup.

Chapter 1

An Old Rival Returns

There's 104 days of summer vacation, 'till school comes along just to end it,

So the annual problem for our generation is finding a good way to spend it.

Like maybe

Building a rocket, or fighting a mummy, or climbing up the Eiffel Tower.

Discovering something that doesn't exist (Hey!), or giving a monkey a shower.

Surfing tidal waves, creating nano-bots, or locating Frankenstein's brain. (It's over here!)

Finding a dodo bird, painting a continent or driving our sister insane! (PHINEAS!)

As you can see, there's a whole lot of stuff to do before school starts this fall. (C'mon, Perry!)

So stick with us cuz Phineas and Ferb are gonna do it all!

So stick with us cuz Phineas and Ferb are gonna do it all! (Mom! Phineas and Ferb are making a title sequence!)

It was another beautiful day in Danville. The sun was shining, the birds were singing, and you could hear the sounds of construction work coming from the backyard of one particular house. This house was where Phineas Flynn and Ferb Fletcher live. However, our story does not begin there, but rather, across the street at the home of Isabella Garcia-Shapiro, Phineas' girlfriend. She had just woken up, and was just about ready to go see what Phineas and Ferb were up to today. "Alright, Pinky. I'll see you later on, okay?" Pinky, her Chihuahua, just barked in response, but Isabella knew he was trying to tell her, 'Okay, you have fun!' She glanced over at her calendar as she walked out of the room. "Oh, July 24th. We'll be back in school soon." Just as she was about to close the door, her eyes went wide. "Wait, wait, wait. It can't be July 24th yet, can it? Please, please, PLEASE, tell me I'm hallucinating!" But as she got a closer look at the calendar, she saw it really was the 24th of July. "Oh no. Oh no, no, no!" She rushed out of her room without shutting the door, and shouted in horror, "PHINEAS!"

Across the street, Phineas and Ferb were hard at work on something when Isabella showed up, looking quite frantic. Phineas, concerned for his girlfriend, asked, "Hey, Izzy, is everything alright?"

"No, Phineas, it's not! Do you know what day it is today?"

"…Thursday?"

"NO! Well, yes, but that's not what I meant! Phineas, it's July 24th! JULY 24th, PHINEAS!"

"WHAT? It's that day already? Oh, man, I can't believe I forgot! Alright, Ferb, we need to put this rocket on hold! Something much more-"

Just then, Candace came outside. "What are you guys up to?" she asked in her usual tone.

"Oh, hi Candace. Well, we WERE building another rocket, but Isabella needs to get away from Maple Drive for today. Chelsea's coming back to Danville today!" Phineas replied frantically.

"Chelsea? You mean that girl that used to live up the street? I thought you guys used to be- wait. Did you say you're building another rocket? I thought you already did that!"

"Well, we did, but we figured we'd take our friends to see our star. You know, the milkshake bar with the really bright sign? STILL can't believe how bright that was."

"Well I'm staying here. And I'm telling mom! You guys are so busted this time!" Candace went back inside to call her mom, as Phineas, Ferb, and Isabella left the backyard.

"Hey Ferb, did you see Perry this morning?" Ferb just looked back over the fence towards the tree, where Perry had been moments before. He then pointed over towards it, to which Phineas responded, "Oh, I get it. He was under the tree but now he's not. Well, Izzy's more important right now."

Meanwhile, Perry had wandered back into Phineas and Ferb's bedroom. He took a quick look around, and, not seeing anyone, put on his fedora and re-arranged some of the books on their bookshelf. Ferb's bed lifted up, revealing a chute. He hopped right on, and actually slid down pretty fast. In fact, he came down the chute so fast, he actually flew right off the end and into his chair, which spun around several times, causing Perry to get dizzy. His boss, Major Monogram, said, "Sorry about that, Agent P. Our slide waxing guy went a little overboard with the wax this morning. Anyway, your mission. Doofenshmirtz was seen heading toward City Hall with boxes filled with sporting equipment earlier today. We're not sure what he's up to, given his poor athletic ability, but it's probably no good. Get to the bottom of it." Perry saluted Monogram, hopped into his hover car, and headed off to City Hall to see what Doofenshmirtz was up to. As he flew over the city, he saw a familiar van with a Fireside Girls emblem on the side. Knowing who was coming and what she brought with her, Perry silently wished his owner and his girlfriend luck with what they were about to deal with.

Doofenshmirtz in the Mayor's Office!

Doofenshmirtz walked into the Mayor's Office in City Hall holding the boxes of sports equipment. He set it down and went over to his brother, Roger. "Hello, Roger," he said, with a hint of resentment in his voice.

"Heinz, what's with the sports equipment? If you're here to ask me to come play football or baseball or whatever, it'll have to wait until later. I'm very busy right now. And besides, you're not very athletic,"

"Oh, will you be quiet! I'm here to challenge you to a series of sporting events to prove that I am clearly the 'Alpha-male' as some might call it. And I'm not taking no for an answer!" Just then, Perry burst through the door. Not literally, of course. Perry has respect for the mayor's property! "Perry the Platypus? What are you doing here? Oh, oh the sports equipment? No, that's not part of an evil scheme. It's just regular old sports stuff. Go on, see for yourself!" Perry walked over to the box, pulling out a baseball bat. After pulling a baseball out as well, and tossing it up in the air a few times and swinging at it, he determined that since he was able to miss, it hadn't been modified in any way, shape, or form. "See, see? I just have this stuff because I need to prove to Roger that I'm better at SOMETHING than he is! And I've been practicing, too! Still, if you're not totally convinced that I'm not up to no good, you can stick around and observe." Perry just stood there, and gave him a look that said 'Yeah, alright.'

Meanwhile, back on Maple Drive, Buford, Baljeet, and yes, even Irving, had shown up to see what Phineas and Ferb were up to today. "Nothing right now, guys. Really, we need to get Isabella away from here before… THEY show up."

Buford, Baljeet, and Irving were confused. "Who are 'they?'" Baljeet asked, curious.

"'They' are the most annoyingly obnoxious people ever! They're Fireside Girls, like me, but for some reason, their leader hates me! And every year, they come by on the 24th of July just to spend the day harassing me! Well, their leader does, anyway. She's just so mean…"

There came a voice from down the street a bit that said, "Do I hear you bragging about me, Isabella?" Isabella froze, stiff as an ice sculpture, while everyone else turned to see who it was. There, coming up the street, were six girls, all in Fireside Girls uniforms. What was unique about these girls compared to other Fireside Girls, though, was that they wore uniforms that were mostly red, with little bits of orange, as opposed to the usual orange with a little red. The girl in front was about as tall as Isabella was, with blond hair worn in a pony tail, and a smug look on her face. Her uniform had an orange collar, but other than that, it was solid red. When they reached the group of friends, they stopped, and the girl said, "It's been a while, hasn't it. I hear you've got yourself a boyfriend now. I'm actually surprised about that. Who would want to date you?"

"That would be me," Phineas said, glaring at her.

"Oh, yes. I remember now. She's liked you for years, Phineas. I would've preferred it if you hadn't noticed her, actually."

"For your information, Chelsea, I told him how I feel. It happened on the Summer solstice, right after we flew around the world in 40 hours."

"Ooh, wow. You finally decided to be brave? Should've kept it to yourself."

"UGH! Chelsea, why are you always doing this to me? What did I do?"

"You know perfectly well what you did!"

"Who is this, Phineas?" Irving asked, out of the blue.

"Oh, you haven't told your friends about me? Well, I guess I should get introductions out of the way. Chelsea Jameson, leader of Fireside Girls troop 37295, at your service! These are my troop members." Chelsea pointed to each girl, saying their names as she went. "Shannon," she said, pointing to a girl with simple brunette hair, who was slightly shorter than her. Her uniform had thin orange stripes on it. "Alexis," she pointed to another blond, this one with her hair looking like Candace's, and slightly taller than her. Her uniform had orange sleeves and an orange collar.

"CHELSEA! I told you, NEVER call me Alexis! How many times do I have to tell you, I prefer Alex!"

"Err, right, Alex. Anyway…" She pointed to a girl with orange hair next. It was curled up in the back, and tied with a green bow at the end. Her uniform was almost completely red, with very thin orange cuffs on the ends of the sleeves. "This is Tori." Then she pointed at another brunette, with shoulder-length hair with two blue bows in it, who was around the same height as Shannon. Her uniform had an orange line on the bottom. "Marissa." Then she patted the last one on the head. She had blonde hair as well, only it was down over her shoulders. Her uniform had two thick orange stripes running along the middle of it. She looked similar to Chelsea, except she was a little shorter. "And this is my little sister, Jessie."

Isabella wasn't exactly thrilled to see them. She wouldn't mind them so much if Chelsea wasn't there, but she was, so, she wasn't in a good mood. "Yeah. Hi."

"Oh, c'mon, Isabella. They seem like nice kids!" Baljeet said, earning a look of confusion from Isabella.

"Nice? Did you NOT hear what I said about them earlier?"

Chelsea wanted Isabella to leave. She just couldn't stand her for reasons she refused to disclose to anyone, even her sister. "Isabella, why don't you just run down to your lodge and talk to your pathetic troop of Fireside Girls."

"PATHETIC? Chelsea, you haven't SEEN any of the things we've done! We've traveled through time, we helped Phineas and Ferb build a giant Papier-mâché airplane, and sent a van off of the rollercoaster at the old abandoned Old Abandoned Amusement Park to get a Maracanut tree so we could get the sap for Phineas and Ferb's super durable bubble! We're anything BUT pathetic!"

"Yeah, okay, Isabella. Listen, just go get your troop, and meet us back here at 10. If you don't show up, don't worry. We'll find you." Chelsea snapped her fingers, then said, "Girls." Her troop followed her away from Phineas, Ferb, and their friends, as Isabella just stood there, boiling mad that Chelsea had called her and her troop pathetic.

"Hey, Izzy, maybe you should go see your troop. Maybe they can do something about this this year."

Isabella calmed herself down, then said, "Alright. Will you come to the lodge with me, Phineas?"

"Absolutely. Ferb, Buford, Baljeet, Irving, why don't you guys stay here and try thinking up something to help us." Ferb just gave a thumbs up in response. Phineas and Isabella headed off towards the lodge while Ferb, Buford, Baljeet, and Irving went inside to think.

Back at the mayor's office, Roger was busy with his work. Doofenshmirtz didn't like this; he wanted to get on with the sports competition he had set up. "Come ON, Roger! What's with you? You always used to love sports, especially kickball!"

"Look, Heinz. I'm very busy right now. But if you insist, I'll join you as soon as I finish my work. Why don't you go play catch with that… what ever it is," he said, referring to Perry. Doofenshmirtz groaned, then went over and took a seat next to Perry.

"Ugh, Roger gets on my nerves so much, Perry the Platypus. Which is why I'm determined to beat him at something today. But waiting for him to finish his work is asking too much! I mean, look at all those papers! Luckily, I came prepared. Behold, Perry the Platypus, the Fast-Forward-inator!" Doofenshmirtz pulled out a small ray gun that looked similar to the Slow-Motion-inator. "Remember the Slow-Motion-inator from earlier this summer? It's like that, but instead of slowing you down, it makes you speed up until you finish what you're doing. See, I just set this dial to say, 4 times speed, and…" He pulled the trigger, which fired a ray right past Perry's bill, causing him to jump and accidentally toss his baseball out the window. The ray hit Roger, and he started working on his paperwork 4 times faster than he had before. "See, Perry the Platypus? He'll be finished in no time. And I have more baseballs where that came from." Perry just chattered, as usual.

Meanwhile, the baseball bounced down into the street, where it hit a car, was flung over to the park, and hit by a kid with a baseball bat. The ball flew a fair distance, was hit by another car, and then bounced off the side of a truck. Eventually, the baseball happened to reach Phineas and Ferb's backyard, where it landed, by complete coincidence, on the launch button for their unfinished rocket. The rocket lifted off, but because it was incomplete, it exploded in mid-air, leaving no trace it ever existed. And wouldn't you know it, Candace shows up just then with her mom. "Look, look, see? They built a rocket ship!"

"Candace, I don't see anything but a baseball. How does that look like a rocket ship?"

"But…. But it wasn't even finished this time! It never vanishes until they're done using it!"

"Well, if that's all, I'm going back to the mall." As her mom left, Candace just stood there, mouth agape. She was so sure that since it wasn't finished, she'd be able to show her mom the rocket. But even that vanished, too.

Elsewhere in Danville, Phineas and Isabella were on their way to the Fireside Girl lodge. Isabella was hanging her head, upset at Chelsea's return. Phineas noticed this, and asked her, "What's up, Izzy? You seem upset."

Isabella looked over at her boyfriend, and said, "Oh, it's just Chelsea, Phineas. She irritates me. All she ever does is make fun of me, sabotage my troop's efforts to earn patches, and just plain be mean to me. This is the one day of the year I never look forward to. I wish I could just stay in bed all day. Maybe then I wouldn't see her. I know whatever she has planned, it's just going to end up humiliating me in some way. It always does. And she won't even tell me why she does these things!"

"Hey, Izzy, c'mon. I know that someday, you'll beat her at something. That's just the kind of girl you are. You keep trying if you fail. I mean, look how long it took for us to end up as boyfriend and girlfriend. But you never gave up on that, did you?"

"Well….. No, I guess not…"

"Exactly. And you shouldn't give up on this, either. That wouldn't be the Isabella that I love." Phineas gave her a quick kiss, and as her spirits lifted, Phineas could tell she wasn't ready to give in on this just yet. "So, you gonna keep trying, or what?"

Isabella, now in a much better mood, said "Absolutely! Now let's go, Phineas! Hmm. I wonder if the Fireside Girls know Chelsea's here yet." They continued walking and soon enough, the Fireside Girl lodge came into view. They walked inside, and found troop 46231 inside, patiently waiting for Isabella to show up. "Alright, girls, come to order." The girls all sat down, and waited for what Isabella was going to say. "Now, as you all know, today is July 24th, the day our rivals, troop 37295, lead by Chelsea, who hates me for reasons unknown, come to town. They want us to meet them on Maple Drive at 10. For what, I'm not sure. But whatever it is, I know they're going to try to humiliate me. However, we may be able to turn the tables if we try. After all, we haven't given up in the past 4 years, so why start now? Alright, any questions?" Adyson raised her hand. "Yes, Adyson?"

"Won't this just go in a cycle? Like if we beat her, she'll try to beat us at something else?"

Phineas spoke up at that. "Well, I could go set something up with Ferb that could be like a competition of sorts. You know, to prove who's truly the better troop? I'd need time to work on it, though."

"Excellent! You go see Ferb about that, Phineas. This time, Chelsea's goin' down."

To be continued

When Isabella said her and Phineas became boyfriend and girlfriend on the Summer Solstice, she was referring to my oneshot, "Summer Belongs to You Aftermath." Give it a look if you haven't already, it's pretty good.