Mirror, rorriM
By Futuramakid
DISCLAIMER: I don't own KP, or anything else her but the Mirror Universe KP crew.
Ron ran as fast as his legs could carry him. He was worried sick about Kim. He thought she was going mad. He burst through the door, where Mr. and Mrs. Dr. Possible were in the kitchen.
"KIM!" he yelled.
"Ronald? What are you doing here?" Mr. Possible asked.
"I got a call from Kim," Ron explained, "and I think this is one heavy sitch, if the call was any indication."
"What do you mean heavy?" Mr. Possible said.
"I mean Kim has snapped heavy. She sounded like she'd gone insane," Ron said, bracing himself for whatever was to come afterwards.
"Ron, take this," Mrs. Dr. Possible said, handing him what looked like a small tube, "it's an experimental skin permeating sedative. If Kim gets violent, or anything too far from the ordinary, stick this on any patch of bare skin."
"I got it, Mrs. P," Ron said. He hoped desperately it wouldn't come to that. He gulped, then opened the door.
"KP?" he said. Ron walked into Kim's room, a little bit nervous.
"Ron?" the mirror Kim said. "Yes, it's me," Ron said.
"Liar! The REAL Ron Stoppable wouldn't carry the pet of the enemy with him!" Kim said, pointing at Rufus, who had popped his head out of Ron's pocket.
"What are you talking about?" Ron asked. Kim lunged forward.
"Die, impostor!" she yelled. She jumped on top of him, pinning him to the floor. Before she could do anything, though, he had taken the experimental sedative's tube and stuck it on the side her arm. She collapsed.
Meanwhile, the Kim Possible that Ron knew was having troubles of her own.
"So, what's the sitch, Wade?" Kim said.
She'd had breakfast with her family's counterparts, who were fairly unsettling, and managed not to stick out like a sore thumb. She took a second to look down at herself for the first time that day. The clothes she had on were more revealing than she was comfortable with, having not only the belly exposed, but a cut hole in the center of the shirt. She had been wearing short-shorts, but was too nervous with the whole "act like this is normal" business to notice.
"It looks like you're from a parallel universe," Wade said, "which, until now, was an unproven theory of quantum mechanics. You're from a universe in which at one pivotal moment, differs from this one. That differentiates your universe from ours. I can't seem to figure out when though. That's the one thing that might help me find how to get you back to your timeline."