A/N: I've sort of been working on this for a while but I didn't divide it into chapter at all. This one's pretty short, but I think the later ones will be longer. It seems longer when I'm typing on my iPod.

Also, I got the idea vaguely from a Harry Potter fic I read on Mugglenet FanFiction, but I'm not sure what the name was. It was good, though. This is different.

Finally, I suck at titles, so if anyone who may possibly be reading this has any suggestions, they would be appreciated.

I don't own Glee.

"Guys, wait up!" Mercedes yelled, her demanding voice echoing through McKinley's halls. Kurt, Finn and herself were late to the evening glee rehearsal- Nationals was in a week, so they practiced in the morning before school, during lunch, immediately after school, went home for dinner and came back for another rehearsal. It was Friday night, so Kurt had invited her to his house for dinner.

And now they were late.

They reached the end of the hallway, and where the choir room usually was there was a closed door surrounded by a faint, pulsing blue light. Finn walked toward it, but Mercedes yelled at him.

"Finn, no! You don't know what's there!" Mercedes scanned her memory for any performances involving blue lights, but none came to mind. She thought of other things it could be- there were plenty. A police investigation, a jock party, a time machine. None of them likely, but Finn didn't know what was there either.

"Finn, Mercedes is right. You shouldn't open it- though I want to know too, and I know I can't stop you..." Kurt said. Before he could finish, Finn had pushed open the door.

"Woah, guys! This is cooler than video games!" Finn exclaimed.

Kurt and Mercedes, now slightly intrigued, stepped in. The room was filled with the pulsing blue light, but none of New Directions were seated. They tried to find the source to no avail.

Two seconds later, their minds blanked.

In another two seconds, Finn looked down.

"Uhm, Kurt? Mercedes? Why am I wearing Kurt's clothes...?"

But Kurt and Mercedes had looked down at their own bodies as soon as Finn started talking.

"Guys, what just happened?" asked Mercedes- in Finn's body.

"I have absolutely no idea," replied Kurt. "Except that somehow, I'm you."

"And I'm... you?" Finn asked.

"Looks like it," Mercedes told him. "How did this- What even- is this possible? What are we supposed to do?"

"Just stay calm, guys, maybe... maybe it'll turn out alright. Maybe we're dreaming. Maybe..."

Finn cut him off. "Kurt, dude, I'm YOU. -You- are Mercedes. -Mercedes- is me. This is weird, man. And I'm supposed to stay calm?"

"Look, guys, we still have to go to glee practice. We have to practice for Nationals- no matter whose body we're in. Just act natural- act like the person whose body you currently possess." Kurt wouldn't admit it, but he was really weirded out, and totally not prepared. He had to act like Mercedes, for McQueen's sake!

"Yeah, Kurt's right Finn. Just... You can be Kurt, right?"

"But what about Blaine? How am I supposed to act like Kurt does around him? Mercedes, I'm not gay!"

Kurt sighed. "Finn, you said you wanted to be an actor. That requires acting. Which means playing someone you're not. Okay?"

Finn sighed. "You're right, I guess. Let's go."

The trio set off down the hall. They reached the choir room and explained why they were late.

"Alright, guys, just sit down. Finn, Rachel, come up here."

A/N: That's sort of a prologue-type thing, I guess.