If you saw "Cheers for Fears" you will recall, Doof wondered what Perry would look like as a guinea pig. Well… he is about to find out!

It was a normal day in Danville. The boys were inventing, Candace was closely watching, and various other people did whatever it is they do. The platypus sat there in the shade of the tree in his host families back yard.

Phineas and Ferb had not yet been outside, they were still up in their room going over some ideas for the day. Perry had decided to get a head start of the day. He sat there, relaxing, as the day began.

At the moment he started to shut his eyes, the alarm on his watch went off. The agent looked down at it and a man appeared on the tiny screen. It was Major Monogram, ready to give Agent P his mission before he even came to his lair.

"Agent P! Doofenshmirtz has been seen by our operatives, creating a NEW -inator, that relates to an OLD idea. He has been studying animals in those "Animals for Nimrods" books and other various titles he checked out at the Danville library, mainly pet related books. We think he may be trying to turn himself into a platypus again, though, seems how he is reading about not just platypi, or… platypeople.. You know what I mean, he could be trying something new. Get out there and stop him from doing whatever it is he is trying to do!" Monogram said as he signed out. Perry the Platypus saluted the Major and ran off to complete his mission.

Just then, as he left, Phineas and Ferb walked outside.

"Alright Ferb, I know what we- hey wait a second… Where's Perry?" the redhead boy asked his stepbrother. Ferb simply shrugged in response. They continued to walk outside as their friends came in.

"Whatcha doin'?" Isabella asked as she fluttered her eyelashes. A weird little feeling came across the boy she directed it at, Phineas did not know what to make of the little quicken of his heart as the girl did this. He blew it off, whatever it was, it didn't matter right now. He spoke up to answer the question.

"Well, Ferb and I have decided to make a silent movie! You know, like the ones from way back in the older times where there was only music and sound effects? So we are going to make our own!"

"Sounds dreamy…" Isabella said as she began to drift into Phineas land. What was she doing? Phineas wondered. She must be really excited about today's activity. Oh well, this should be fun… why did my heart just speed up a moment though? Eh, probably just excitement for this movie!

They went to get started on their silent movie.

Perry arrived at Doofenshmirtz Evil Incorporated. Looking at the sign on the elevator that stated "Out of service" he sighed to himself. Not again. The monotreme proseeded to walk the long way up the stairs instead. By the time he got all the way to the top level, he was too tired to kick down Dr D's door. He simply knocked on it to save his energy.

A voice was heard from inside, though it was too hard to make out what was said, it was obviously Dr Heinz Doofenshmirtz. The door swung open to reveal the man.

"Ah, Perry the Platypus! How wonderful for you to come! And by that… I-I don't think I can shorten that word… Ya, I just mean what I said. Forget about it! Just come in…" he said as he gestured for the platypus to walk into the room where the scientist had been working.

"I bet you're wondering what I've been up to huh?" he started to say with his back turned to Perry. The small mammal looked at him with an expression that stated, 'Well duh!'

"Well, first things first!" as the man said this, a cage rose from the floor beneath Perry. This wasn't just the normal cage he was used to though. There was a wheel in it and one of those water bottles that hang on the side of the cage. Perry looked at the man from his cramped little cage, with a confused look.

"Yeah, I guess now you are REALLY confused! Well, you see Perry the Platypus. Something I said a few schemes ago has been bugging me lately. And no, before you ask, it's not big laundry again. That was already proven a failure. No, this time I have been thinking to myself, what WOULD you look like if you were a guinea pig? It really bugs me! I mean like seriously, I like, lost sleep last night because I was up thinking about it!... Anyway... So this time, you will be my literal guinea pig!" he finished off with a maniacal laugh. As soon as he stopped his laughing, the doctor looked down at the animal who was now glaring at him from the tiny cage. He smiled and pulled out a small ray gun from his lab coat pocket.

"This, is the Guinea Pig-inator! It can turn any living thing it hits into a guinea pig!"

Perry looked at the small device with curiosity. Why would this man let the weirdest of things bug him all the time? And why did it have to directly involve me this time? The -inator was pointed at the agent and let out a blue beam. Something emediatly felt different with Perry. He didn't feel so cramped in the cage. Dr D towered over him even more than usual… and he felt even furrier than he had before. He turned and saw his hat was laying behind him, only it was huge! Everything was huge! Perry turned to look at his self in a tiny little toy mirror in his cage trap.

As he did this, and as he saw himself, he heard a laugh.

"Ha ha ha! I knew it! I knew you would be teal! Yes! Oh, Perry the Platypus, look at yourself! You're just SO adorable now!" Doofenshmirtz shouted excitedly.

The man was right. In the reflection of the mirror, was a tiny teal guinea pig. His back feet were orange and a mark that went around his mouth and over his nose was also the same color orange. He had no tail, or at least one that he could see. But it was for sure that he was now a tiny little, teal guineapus.

"Awww, come here Perry the guineapus! Let me see you." Doof bent down to the cage and started to open the little door on it. As soon as it was opened, Perry the Guineapus leaped out and ran for it.

"No! Perry the Guineapus! You get back here this instant! Hey, are you even listening?"

The evil doctor set his -inator on the ground to go and chase after Perry. The tiny little teal animal noticed the discarded -inator and quickly turned and ran straight for it. He dashed under Dr D's legs as he was about to grab the animal.

"W-what are you doing?" the man asked as he turned to see the agent standing next to his -inator, which was now pointed right at HIM!

"NO! Perry the guineapus! DON'T DO THAT! NO-" he was cut off as a blue beam hit him. Something felt different. He looked down at himself. Similar to Perry, he had been turned into a guinea pig. He was brown all over, with a mess of fur on top of his head. He wore a tiny little lab coat and his little feet were black. The Guineashmirtz looked at himself in shock.

"Wow! I never thought about how I would look as a guinea pig! I have to say though, I kinda like this!" he then looked up at the Guineapus who was swiping his paws on the ground like he was about to charge.

"No! No, Perry the Guineapus! Don't d-" he stopped as the agent in front of him began to charge. He turned to run away, but was too late.

Doofenshmirtz was hit right in the back and flipped over with his face up. The face of Perry came into his view with a smirk across it.

What will happen next? What will they do, now that they are both guinea pigs… or well, a guineapus and a Guineashmirtz! :P I have actually drawn Perry as the Guineapus, but not Doof yet… perhaps I should get on that! :) Oh ya… And for those of you who seem to only like stories with the whole Phinbella thing, I did a tiny bit for you, but I do not like those Phinbella things so it will just be that one part where he is just oblivious to it… BECAUSE THAT IS HOW HE IS IN THE SHOW!