Dr. Heinz and Mr. Perry

By: Spiritofdawolf

Summary: When Doof discovers how to make his ancestor's Jekyl and Hyde formula, he plans to convert it to energy and blast himself so he can take over the Tri-State Area. But things go wrong when Perry gets hit instead by accident. At first Doof is having fun with the mistake, but eventually discovers that if he doesn't reverse the effects on his little frienemy soon, Perry might be stuck in 'Mr. Hyde' form for good.

-Just in time for Halloween. ;) Well, a little early, but still. Hope you enjoy. I also hope you have some good spooky fun for Halloween.

0000

Chapter one- Old Family Recipe

It was another typical day in Danville. Phineas and Ferb were up to their usual 'shananigans' as Candace normally put it. Their pet platypus was lounging by the tree in the backyard watching the antics of his owners.

It was a crisp autumn day. Halloween wasn't too far away. Just a couple of days.

As the platypus half listened in on his boy's plans; a small part of the discussion being about what they were going to dress up this year; his wrist started beeping.

The platypus directed his attention to his watch and recognized the all too familiar signal that his boss wanted to see him. He sighed as he got up and checked to be sure no one was looking before going to one of his secret entrances.

As he headed inside to go down, he heard the classic

"Hey, Where's Perry?" of his owners and rolled his eyes knowingly.

Within seconds he had plopped down into his chair and turned the monitor on.

His boss, Major Monogram, appeared on the screen.

"Good morning Agent P." he addressed the monotreme who gave him his full attention.

"Dr. Doofenshmirtz has been digging through his family archives for the past day or so. We don't know what he's looking for, but no doubt, he's probably searching for something evil he can use for a scheme. So, go on out there and make sure he's not doing anything evil."

Perry saluted the Major before heading out.

As the Major watched his agent take off, he heard the voice of his intern next to him, off screen.

"Sir, did you see my costume for Halloween yet?"

"Yes, I did." Monogram rolled his eyes. "Several times."

Meanwhile, Perry arrived at the building of his nemesis as the casual evil jingle played.

He landed on the floor just in time to be snagged by a mechanical arm and thrown in a large carved pumpkin. It was a silly trap, Perry had to admit, but at least it went with the time of year.

"Ah, Perry the Platypus, good to see you." Doofenshmirtz said stepping into view.

"Do you like your trap?" he asked with a smirk looking at Perry looking through the jack-o-lantern's eyes at him.

"I figured since it was almost Halloween, I oughta come up with a Halloween themed trap. Ooh, Ooh. And he's the fun part." He said as he snapped his fingers and a small light came on inside the pumpkin by Perry giving it the traditional glow of a Jack-o-lantern in the dark; save for the platypus inside it.

"Viola, a Perry-lantern!" he chuckled at his own joke.

Perry rolled his eyes, but couldn't help but smirk slightly himself.

"Now, Perry the Platypus, I suppose you're wondering what I've got planned for today. Well, you remember last Halloween when I told you the story about my ancestor Jekyl Doofenshmirtz making a formula to turn himself into a monster?" he began.

Perry nodded with an eyebrow raised, wondering where Doof was going with this. Somehow he had a suspicion.

"Yeah, well, being that it's Halloween I've been looking for just the right scheme. Then I remembered my ancestor and started to look through my family's archives and locate his files. You'll never guess what I found!" Doof said starting to get excited.

Perry frowned slightly, having an idea what it probably was.

"That's right, Perry the Platypus," he squeaked with delight. "The notes for how to make his infamous formula! However, I didn't want to drink it, you know, in case it tasted bad. So, I decided to convert the formula into energy that I intend to blast myself with so I can take over the Tri-State Area!" he cackled.

Perry's frown narrowed into a glare. He definitely had to stop this. If he failed the outcome would be catastrophic.

"Behold, Perry the Platypus!" he said pushing a button revealing his hidden Inator.

"The Jekyl and Hyde formula converted into an energy beam Inator!"

Perry gave him a look that said, 'seriously?'

"What? I couldn't think of a better name!" Doof retorted causing another eye roll from Perry.

"Roll your eyes all you want, Perry the Platypus, that's not going to stop me from finally becoming the ruler of the entire Tri-State Area!" he shouted.

As Doof headed over to start up the Inator, Perry crawled out of the pumpkin. Yes, catchy trap, but very poorly planned.

Doof had just reached the Inator when Perry body slammed him.

"Prepare to see the most-OOF!" Doof cried out as he fell to the floor from Perry's strike.

"Perry the Platypus, how'd you get.." he started then stopped. "Oh, come to think of it…I probably should have sealed the top of the pumpkin…yeah…"

He was cut off by the Monotreme delivering another punch to his face..

"Okay, Perry the Platypus, now you're getting on my nerves." Doof frowned, kicking the platypus off of him and running back to the Inator. He switched it on.

Thinking quickly, Perry hurled the jack-o-lantern trap at the Inator in an intent to hit the switch back off. However, instead of turning it off, it just broke the lever.

Perry face palmed as Doof turned to him. "Really? Really, Perry the Platypus?" he said flatly.

"You do realize that nothing is stopping it from fir-" he started, then stopped and smirked.

"Ha! You did it to yourself this time, Perry the Platypus!" he taunted as he ran back to the front of the Inator. It would go over any second. He wanted to make sure he was in the right position to get zapped in time.

Perry glared. Despite the mishap, he could still destroy the Inator if he could get to it in time before it fired. He made a running leap and kicked at the Inator. To buy time, he could at least kick the gun away from Doof before it fired whilst he searched for the self destruct button.

He succeeded in knocking the gun away from Doof who responded with a "Oh, come on!" and scrambled to get in front of it again. Perry knocked him down as Doof tried to run to it.

Perry continued to look for the self destruct button. Doof sulked for a second but then noticed that the pumpkin wasn't completely smashed. Grabbing what was left of the pumpkin, he threw it at Perry.

"Take that, Perry the Platypus!"

Perry didn't see it in time and got knocked back off of the Inator and tumbled to the floor. He rubbed his head slightly. The Inator was getting louder and whirring as it was only a second away from shooting.

Perry looked to see that he'd been knocked into the path of the beam. His eyes widened as he tried to get up and move out of the way in time.

"Perry the Platypus, look out!" Doof cried out, not having expected this outcome. He was surprised that he was actually concerned for a second. But didn't have much time to reflect on it as the next second, a beam fired and engulfed the agent before he could move.

Doof was wide eyed as he looked to his nemesis.

"Perry the Platypus?"

The steam from the beam cleared revealing the small agent on the floor looking dazed for a second. But other than that, nothing seemed to have changed.

Doof's concern quickly turned to disappointment.

"Aw, man. It doesn't work!" he groaned. "I was really hoping it would work." He sulked again.

Perry shook his head and looked himself over. Thankfully nothing appeared to have changed. Perry breathed a sigh of relief. Then got back up. He still had a job to do, even if the Inator didn't work.

Leaping on the Inator again, he found the self destruct button and quickly pressed it.

"No! What are you doing?!" Doof cried, even though he had a good idea.

The Inator rumbled and finally blew up. Another scheme averted.

"Oh, come on!" Doof complained. "It doesn't even work and you destroy it anyway?"

Doof activated his jet pack and took off.

"Curse you, Perry the Platypus!" the Dr. yelled his signature line as the monotreme flew off.

Perry grinned slightly at that. Same old, same old. All the same it was lucky for him that the Inator was a failure.

"Good work, Agent P!" the Major congratulated him when he returned. "Another job well done!"

Perry saluted and Monogram clicked off the screen. As Perry went to head back up to his family.

As he did so, he couldn't help but think what could've happened if it had worked. He wasn't sure what he would have done if it had.

Well, regardless, he'd destroyed the Inator. Now it couldn't happen. Then again, what if Doof tries to rebuild it?

He resumed the position of a mindless pet as he walked over to his family, who weren't aware of his secret; the thoughts still swimming in his mind.

Well, for the time being at least, there was nothing to worry about.

….or was there?

-R&R. I'll try to update soon.