The Harmonizer-Inator didn’t explode. It sang —a discordant, beautiful, ugly chord of static and feedback. And across the city, the Harmonized citizens blinked. Shook their heads. Remembered.

Ferb silently unspooled a roll of duct tape from his pocket.

This Perry wore a tattered cape. A crown of bent spoons sat askew on his head. And around his neck hung a locket. Inside were two tiny photos: the erased faces of the 2nd Dimension Phineas and Ferb.

Suddenly, spotlights blazed. A voice—smooth, cold, and terrifyingly familiar—echoed across the chamber.

“Entropy reversal via sentient harmonic resonance,” he said. That was three words, so Phineas knew it was serious.

“He’s been resisting the Frequency for three years,” Dr. Linda said, almost admiringly. “He remembers them. He leads a resistance of one. He’s broken into every facility. Sabotaged every Inator. He calls himself… Perry the Purposeful .”

Phineas knelt. “We’re going to get them back. All of them. But I need you to tell us how to reverse the Frequency.”

But the flowers were made of fused metal and melted plastic. The trees were skeletal broadcast towers. And the sky… the sky hummed.

The woman tilted her head. “Not your mom. Not anymore. In this dimension, after your Doofenshmirtz fled, someone had to restore order. Someone who understood that love is just a slower form of control. I repurposed his technology. I created the Frequency. It doesn’t destroy—it recomposes . Every rebel, every free thought… tuned to silence.”

The second trip was worse. The portal shuddered, spat them out upside down, and they landed in a pile of rusted O.W.C.A. badges.

“Prime Phineas,” the recording crackled. “We held them off. For two years. But the remnants of Doof’s army… they didn’t just rebuild. They found something. Something under the city. It’s not an Inator. It’s a frequency . And it erased us. Ferb, me, the entire resistance cell. Everyone except…” The hologram glitched. “Come alone. And bring your platypus.”

They didn’t stay long. The 2nd Dimension would need years to heal. But as the portal hummed open, the other Phineas grabbed Prime Phineas’s arm.

Phineas felt sick. “Where’s our Perry? The 2nd Dimension Perry?”

“I was wondering when you’d arrive, Phineas. You’re late. And punctuality is the first casualty of chaos.”

One rainy Tuesday, while Ferb was quietly tuning a theremin-powered ceiling fan, the backyard shed shuddered. A disc of blue energy sliced the air. From it tumbled a battered, half-melted platy-pus-shaped helmet.