PROLOGUE- So hey. Everyone remember that excerpt I put into my other story If You Had Five Minutes? This is the story that that came from. Let me know if I should change the title.

No idea what I was thinking when I wrote this, but I already have the idea down, as well as an idea for a crossover with Gravity Falls involving this, and something else.…that one might be a bit complicated, so let me know if you think I should do it.

The first sentence makes this story self-explanatory. But anyway, read it, and I hope you enjoy!

I don't own Phineas and Ferb.

GENERAL POV

"Behold, Perry the Platypus, my Mermaid-inator!" Dr. Doofenshmirtz yelled at the top of his lungs.

He threw his arms out towards the large, fish shaped (purposefully this time) machine behind him. It was glowing a slight green color and, if Perry allowed himself to admit it, was actually quite impressive.

Even so, Perry looked at the mad scientist with a baffled look. The doctor lowered his arms and placed them on his hips. "What?"

Perry raised an eyebrow and a smile twitched at the corner of his bill. Dr. D rolled his eyes. "Oh, laugh now. Sure mermaids aren't real. Yet. But when I hit all the people of the Tri-State Area with this machine, and then when I flood the city, I will control them all! You know, because I will be the only one able to be on land."

Perry kept his eyebrows in the air and Doof scowled.

"What? It's a brilliant plan! Of course, there is always the fact that they could just live underwater, or swim away to a dry place and turn back into a human within 45 seconds of being completely on land, but I'll cross that bridge when I get there!"

Perry cocked his head slightly, the dubious look still on his face. Dr. D rolled his eyes. "Oh, come on! It's not like it will actually hurt anyone! When the ray hits them, they'll be half a fish for all of two minutes, and then they'll be human again until I flood the city. And then after that, they've got to be like, half submerged or drenched in water to turn into a mer-person."

Perry gave Dr. D another look that made the man feel really stupid, and he turned a deep red. "You know what, Perry the Platypus, you're right. It is kind of stupid. I'm really supposed to believe that my machine can effectively turn people into half of a fish?"

Perry smiled and easily slipped out of the trout that Dr. D had caught him in. It wasn't the greatest smelling trap, but it was the easiest in the world to get out of.

Dr. D threw his hands in the air. "Oh, come on! I tell you that I'm not doing my evil plan, and you still escape? Just for that, I'm pressing the button!"

Heinz ran for the machine and threw his fist down on the fire button, just as Perry shoved him and the machine towards the right, causing the beam to fly off in a random direction.

Perry hit the self-destruct button clearly marked on the side and he leapt over the edge of the building as it promptly blew up, leaving Dr. D in a smoking mess. He coughed into his hand and glanced around.

"Great," he muttered. "The first day of summer vacation, and he's already blown up my lair. It's going to be a long summer."

He cleared his throat, looked up at the disappearing speck of Perry, and yelled out, "CURSE YOU PERRY THE PLATYPUS!"

THREE MINUTES EARLIER

Candace Flynn sighed and leaned back against the tree in her backyard, staring around the lawn.

There wasn't one monkey or unicycle left in the entire area. How her brothers had gotten rid of them, she had no idea.

"Great," she mumbled. "School got out yesterday and my brothers are already making mischief. I am so going to bust them this year."

She stood up from her current position and had started for the sliding door when she tripped over one of the pedals from the unicycle and collapsed to the ground. the pedal tumbled from it's original spot to a position just in front of her. For a moment, there was a brief green color, and then Candace picked up the pedal with a grin.

"Awesome! Evidence!"

Her smile faded. "Of a bike pedal. Not bust worthy."

She tossed said piece back to the ground and tried to stand. Finding her legs immobile, she slid them in front of her to see what was wrong.

What she saw wasn't what she expected.

Candace almost started screaming, but she quickly clapped her hands over her mouth to keep the yell from echoing around the yard.

"Oh my freaking gosh," she muttered.

The gate swung open and Isabella walked in, notebook in hand. She was reading it intently, and Candace bit her lip.

"Hmmm," the girl murmured, "What's up? Nope, that's not it. What about….Yo, was'up?"

Isabella stuck her tongue out the corner of her mouth and scribbled on her notebook with a pencil. "Yuck, what am I, a gangster?"

Candace coughed. "Isabella?"

Isabella held up a hand. "One sec Candace. What are you doing...? No, too accusing. Huh…whatcha doin?"

A slow smile split her face, and she made a big circle on her paper. "That's it! Candace, that's-!"

She looked up and her book and pencil fell to the ground, as did her jaw. She stumbled slowly over to Candace and dropped to her knees next to her. "Oh my freaking- Phineas! Fer-!"

Candace clapped a hand over her mouth and shushed the girl quickly. "No, Isabella, shut up! I don't want them out here!"

Isabella nodded slowly and Candace removed her hand. Isabella stood shakily and gulped. "How on earth did this happen?" she asked.

With her hand she gestured downwards, her trembling fingers hovering just barely over where Candace's legs should have been. They were now replaced with a red and orange tail, complete with fins at the bottom and a bright red swimsuit top to boot.

Candace was about as pale as a ghost, and she shook her head. "I have absolutely no idea Isabella. No idea at all."

She bit back a shriek as the tail- the freaking TAIL- disappeared, leaving her legs in its place. Candace braced a hand on the tree and stood up, trying her best not to puke. Isabella quickly grabbed her elbow and steadied her.

"Well," the girl muttered with a nervous chuckle, trying to keep Candace from passing out, "summer just got a lot more complicated."

So, again…..no idea where this came from. It just hit me one day…..while I was watching H2O…so maybe that's where it came from. I don't own that show, and this story probably won't resemble it all that much.

This will follow the story line of the series, mostly of the episodes involving (Duh) water, with a few random episodes thrown in. And the monkey and unicycle thing was actually mentioned in the first episode of Phineas and Ferb.

If you like it, I'll keep going. If not, then it had a good run (of like, 7 pages)

R and R!