Xehanort was running out of patience. The Door to Darkness was so close to being open that he could practically taste the double-scoop of dark chocolate awaiting him within. But without Sora's Keyblade, there was no way he could jimmy those doors open! And the Keyblade master was never going to just give up his Keyblade...unless...wait! Idea!
"Eureka! I have you now, young Keyblader!" Xehanort laughed maniacally as he built his latest invention. "Behold: the Baby-inator!"
"Hey! You stole my idea!" said Dr. Doofenshmirtz as he stormed into the lab. But he was subsequently disposed of via the convenient hole in the ground.
Pretending he was never interrupted, Xehanort continued to laugh maniacally until Sora broke down the door. "It's over, Xehanort!"
"Ah, young Keyblader," crooned the coot. "Perfect timing!" With a flip of the switch, Xehanort fired off the weird raygun and shot Sora, Riku, Kairi, Donald, Goofy, and Backpack. Everyone turned to babies, except Backpack who instead transformed into a hand purse and then disappeared because, you know, Backpack didn't exist.
"Now, young Keyblader, obey your elder and give me the Keyblade!" Xehanort made to steal candy keys from a baby, but Sora just started crying. Then everyone else started crying, and before he knew it, Xehanort was changing diapers and warming bottles.
It was around the time Xehanort was burping baby Goofy that baby Donald poked baby Riku in the eyes. The two then started kicking each other until baby Sora intervened and shared his pacifier with them. But then baby Donald hogged the pacifier and everyone started crying even harder.
"Would you all SHUT UP!" Xehanort shouted, his nerves shot. But that just made the babies bawl themselves crazy.
Xehanort was about to explode when suddenly baby Goofy wriggled free and unzipped Xehanort's black coat. The coat fell off revealing the mad scientist's moth-eaten smilie-faced boxers. The babies all laughed. Xehanort shrieked and covered himself. He then ran into his bedroom to put on some pants.
In the small span of time they had to themselves, the babies organized a plan. Baby Donald sucked his thumb while baby Kairi played with a dolly of a moose she had found in Xehanort's desk drawer. At the same time, babies Sora, Riku, and Goofy chased each other around all the weird machines. Baby Sora's big shoes got caught on some of the wires and sent all the machines toppling in a domino effect.
"What's going on here?" Xehanort shouted as he rushed out of his room with his pants down. It was then that the Baby-inator crashed to the ground, shooting off one final beam before dying. Xehanort turned to a baby and started drooling.
The door then opened and Dr. Doofenshmirtz returned accompanied by Agent P. "See, I told you it wasn't me, Perry the Platypus! It was him! He did it!"
Agent P looked around and saw nothing but babies. He then looked up at Dr. D.
"Don't look at me like that!"
Agent P just stared.
"I'm serious! There was an old guy with pointy ears and Leonard Nimoy's voice and—and now I just sound ridiculous..." Dr. D sighed. "Well, as you can see, the inator is destroyed so, want to go get some ice cream?"
Agent P pointed at the children.
Dr. D rolled his eyes. "Yes, they can come, too!"
Agent P got a stroller for the babies and followed Dr. D to the ice cream parlor. There, they bumped into Roo who offered to change everyone back to normal in return for a Pooh stick. Agent P pulled one out of his fedora, and before anyone was the wiser, Sora & friends grew up again. Even Backpack came back! But Xehanort remained a baby because he was cuter that way. While everyone enjoyed their ice cream, Roo returned the Pooh stick to the Fellowship of the Pooh.
The end.