Mane 6 vs. Big Five
Chapter 1: The Big Five Appear
AN: This doesn't make any attempt to fit into canon, at least not with Yu-Gi-Oh, as the Big Five have their own duels with the main characters there and perish when the virtual world is destroyed. So just enjoy the crossover.
Disclaimer: All characters belong to their respective owners
The Mane 6 were having a picnic. Rarity forgot to bring a ribbon with her and fainted on her fainting couch, while Fluttershy nuzzled a squirrel, and Applejack bit Rainbow Dash's tail for fun.
Suddenly, a portal opened up and sucked the Mane 6 into it. They appeared in white space.
"Where are we?" said Fluttershy.
"I don't know," said Twilight Sparkle. "This doesn't look like anywhere I've known, though I have been in a similar dimension when I became an alicorn."
"I've been in dimensions like these before!" said Pinkie Pie.
"Why does that not surprise me?" said Twilight. "Come to think of it, this is like when I broke the fourth wall to undo Trixie's spell on you."
Sinister laughter in five voices could be heard, and five shadows appeared, towering over them.
"We are the Big Five!" said Gansley, the fat bald man in the middle. "We've been imprisoned in this virtual world, and now we must steal your bodies to escape!"
"Why would you want ponies?" said Twilight.
"Because this was the first dimension we could find," said Crump.
"Now, we're going to separate you," said Gansley, "and we'll fight. The winner leaves this world in a pony's body. The loser... will be destroyed!"
"Hey, no one can die in this show!" said Pinkie Pie.
"King Sombra?" said Rainbow Dash. "Arimaspi? Windigos? Queen Chrysalis?"
"Actually Chrysalis lives," said Pinkie Pie. "She returns at the end of Season 6. Likely in the name of fan pandering! But good point for the others. And this isn't the show, it's a fanfic. Anything can happen here!"
"Breakin' the fourth wall again," said Applejack.
"Enough!" said Gansley. He raised his arms, and the ponies disappeared down two holes. As Fluttershy was falling down one hole, Twilight bit her tail to try to pull her back up, but fell down the hole with her.
"Now," said Gansley, "pick a pony. Any pony."