Phineas and Ferb Meets Osmosis Jones

"Hey, Ferb, I know what we're gonna do today! We are gonna learn about human biology!" said Phineas excitedly.

"Okay," said Ferb.

"Hey Phineas, whatcha doin?" asked Isabella, who entered their backyard with Buford and Baljeet. Also, Perry was gone.

"Where's Perry? Also, we are learning about human biology. But first, we need a test subject, though. Let's visit the zoo to find a willing test subject."

"Okay," said Ferb.

So the children all went to the zoo and looked for a willing test subject so they could learn about human biology.

"Hello sir, what's your name?" Phineas asked a man who was working at the zoo.

"Frank," the man replied. Frank was a man who was tall and he had brown hair and some facial hair. Phineas didn't know what it was about the man, but there was just something about the man that drew Phineas to the man.

"Hello, Frank. Biology is so fascinating, isn't it? I mean, did you know that sharks don't need to have sex to reproduce?" Phineas said, and Frank looked surprised and impressed.

"That makes no sense, Phineas," said Baljeet, but Phineas just rolled his eyes.

"I read it in a Wattpad book about biology, Baljeet. Wow, and you're supposed to be smart," he said sarcastically. "Now, Frank, do you want to help us learn more about biology?"

"Sure, kids," Frank agreed.

"Alright, then it's settled! Let's head back to my house," said Phineas.b

"Okay," said Ferb.

"Wait, aren't you going to explain the details first? Like, do you want me to show you some of the animals at the zoo or something? And why are we going to your house?" Frank asked nervously, but Phineas just shook his head.

"Oh, Frank, you'll just have to trust me," he said in response, and the group went back to Phineas and Ferb's house.

---MEANWHILE AT THE O.W.C.A.---

"There you are, Agent P," said Major Monogram on the screen as Perry entered the room. "Today, we received some information about Dr. Doofenshmirtz's newest scheme. We have learned that he has purchased some medical grade face masks, petri dishes, and other supplies for working with microorganisms. We don't know what he is doing, but we need you on this right away."

---MEANWHILE AT PHINEAS AND FERB'S HOUSE---

"So, Phineas, what's your plan?" Isabella asked, and turned to the piles of supplies lying in his backyard.

"Today, we are going to shrink ourselves to the size of cells and enter Frank's body for a biology adventure," he explained as Ferb started to build a machine.

"What?" Frank asked, but Phineas ignored him as he began to construct the machine with his friends.

---MEANWHILE AT DOOFENSHMIRTZ EVIL INCORPORATED---

♫ Doofenshmirtz Evil Incorporated ♫

"Ah, well if it isn't Perry the Platypus!" Doofenshmirtz said as Perry entered the room. "I bet you wonder what I am creating, don't you? Well, I plan to create a virus that is deadly enough to infect everyone who stands in the way of me taking over the entire Tri-State Area! Come take a look at my Virus-inator!"

Doofenshmirtz led Perry over to his Virus-inator, which looked like a large ray gun that was pointing out of his window. As Perry stepped closer to the machine, a cage trap fell and captured Perry, and Doofenshmirtz laughed.