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A platypus in a fedora crashed into a tech-filled space amongst a rush of rubble. He landed in a ninja pose, ready to battle his nemesis.

"Ah, Perry the Platypus," A hunched, strange-looking man in a labcoat turned to face Agent P. The animal waited, frozen in his pose. "What? Are you waiting for a trap? Well, I don't have one for you."

Perry blinked in surprise and stood. Dr. Doofenshmirtz smiled cunningly. "It's true. I don't have one for you… but Sven does!"

A bolt of blue and purple light shot out from nowhere and hit Perry squarely in the chest. His thoughts locked up; he couldn't summon the willpower to move. But his mind puzzled over something. Who's Sven?

Doofenshmirtz cackled, "It worked! It worked! You both fell for it! First when Sven did it to that other agent and then I did it to you! Hehe! Come out, Sven, I want Perry to see my partner."

The platypus slowly registered the, "that other agent," part of his speech. Major Monogram said Doof found a partner. He also said that this partner—who must be Sven—had his own nemesis. Who is this other agent?

A second man advanced out of the shadows, smiling eviliy. He was wearing a ratty white labcoat and dark green jeans with a coffee-stained grey shirt. He had tousled black hair and a face like a prune, though he couldn't have been much older than Doofenshmirtz. He held a futuristic ray gun in his hand, pointed at Agent P.

"So, this is Perry the Platypus. I've heard so much about you from Heinz. I am Dr. Sven Meddleshmirtz," he said. He had something of a German accent, like Doof. They must both be from Drusselstein, deduced Perry.

"You didn't hear nearly as much from me as I heard about Terri. You went on and on and on about her!" Doofenshmirtz snapped.

"You talked for an hour straight about how your nemesis was sure to be better than mine!"

"You know what, I'm not having this conversation again," Dr. D sighed. "Just grab Terri and I'll grab Perry and we'll put them in a cage. I don't want to use up any more batteries than necessary with that Mind-Freeze-Inator."

Meddleshmirtz complied, glowering silently. But before Perry had the chance to see this Terri they were talking about Doofenshmirtz picked him up and shoved him into a metal cage. Not being able to move, Perry accidentally tipped over onto his side. Magnificent veiw of the wall! He heard the other agent being placed inside with him.

"Alright, now release them!" Dr. D called out.

Perry suddenly felt movement returning to his limbs. He got up and spun around just as his fellow captive was turning. Perry was now face to face with the prettiest platypus he had ever seen. All he could think was, Wow… He felt his bill drop open.

A brown bow perched on the dark band of her fedora. Intelligence sparkled in her deep blue eyes. Lashes curled above them, setting off their color. Her fur had a shine to it not commonly seen—on any kind of animal! She was an absolute wonder, and Perry didn't even know her name. He stared at her in awe, and she gazed back a bit more unobtrusively.

"Perry the Platypus, meet Terri, another platypus. I'm sure you two will get along just fine, seeing as you're both platypuses, or platypi, or… whatever the plural of platypus is," Doofenshmirtz said.

Agent P, slack-jawed and recovering from shock, managed to drag his eyes away from Terri for a moment to look at Doof. Terri turned to face the two scientists and crossed her arms over her chest in cute impatience.

Meddleshmirtz looked at Perry's expression and crowed in glee, "Ha! Perry and Terri, sitting in a tree—"

Doofenshmirtz cut him off quickly, "Can we just get to the backstory here? I have an appointment at one."

Both Terri and Perry burned with shame, though the other didn't know it. They both thought at the same time, No! It's just that I've never met another platypus before! That's all… really!

"Behold, Perry and Terri…" Doof paused for dramatic effect as Meddleshmirtz whipped a sheet off a large metal contraption. "The Remember-What-The-Amnesia-Inator-Made-You-Forget-Inator! Boy, what a mouthful! Maybe I need to make it just the Remember-Inator."

The Remember-Inator looked like a giant ray gun on wheels, with a control panel on the back. It was directed straight at Doofenshmirtz.

Perry tensed immediately. If he remembers the escapade in the second dimension… no. I won't let him remember and put Phineas and Ferb in danger.

Terri sensed his unease and wondered at it. They told me he is a pro… why is he nervous? Could it be just this particular –Inator?

Knowing nothing of their thoughts, Dr. Doofenshmirtz continued, "You see, I was going over my –Inator-themed calendar. Now, the day marked with, 'Amnesia-Inator,' has always been a mystery. But then I found written on July 13: 'Other-Dimension-Inator!' Can you imagine that? I don't remember ever building one of those! But, I figured that if I didn't remember building an Amnesia-Inator, then maybe this memory loss was similar! So I created this," The doctor had been rippling during his flashback/backstory, but now he gestured wildly at the –Inator. "The Remember-What-The-Amnesia-Inator-Ma… eh, you know, I'm just going to call it the Remember-Inator," he said, slumping.

Perry clenched his little hands into fists. "Rr-rr-rrr-rrr!"

Doof turned. "What's that, Perry the Platypus? I didn't understand you,"

Meddleshmirtz suggested, "Maybe he's agreeing with you on the name?"

"Somehow I don't think so… Well, anyway, let's light this pop-stand, or whatever they say these days…!" Dr. Doofenshmirtz stood in the path of the Remember-Inator, waiting for Sven to warm it up and fire.

Agent P sprang into action. Out of the huge arsenal of tools in his hat, he took a laser cutter and quickly sliced through the bars of his prison. Leaping out, he knocked Doof's feet out from under him, causing the beam from the Remember-Inator to miss and smash a table.

Terri escaped as well, bashing into the –Inator and swinging it around so that it faced the balcony. But she thought, I don't see what's so bad that he won't let Doofenshmirtz remember… It must've been something really important that he forgot. She then jumped gracefully down onto Meddleshmirtz and pounded him away from the Remember-Inator.

Perry whirled around Doofenshmirtz in a storm of fighting. Soon he knocked the evil doctor to the ground and raced toward the Remember-Inator. He began to push it toward the egde of the deck. For such a big machine it was suprisingly light. Terri finished dealing with Meddleshmirtz and raced over to help him. Together they shoved the –Inator into open air and watched it sail down, down, down, to crash on the street below. Both evil doctors cried, "Nooooooo!"

Doof said, "Curse you Perry the Platypus!"

Meddle said, "Curse you Terri the Platypus!"

The two animals doffed their fedoras to each other, leaped away, and jetpacked to their separate lairs.

In the explosion from the –Inator, nobody noticed a stray beam of light sailing through the air, bouncing off several windows and car mirrors, and jetting straight into a certain Flynn-Fletcher backyard, where two little boys received the second-biggest jolt of their lives.