When a mysterious ship appears in Equestria, the Cutie Mark Crusaders take the opportunity to get their cutie marks in sailing. Unfortunately, said ship belongs to the Outworld Emperor Shao Kahn, and is collecting combatants for the latest Mortal Kombat tournament. Now, Twilight Sparkle and her friends are forced to enter the tournament to save their friends and stop Kahn from taking over the world.

Crossover fic based loosely on the 1995 MK movie. Violence tends towards the comedic variety rather than hardcore blood and gore.

Due to a failure of the ponies who lived before Equestria, a spacial alignment that would normally be nothing, instead opens up a portal to an alternate dimension which is home to a world that's inhabitants are the exact opposites of the ponies living in Equestria. As an attempt to stop the evil ponies within this alternate universe from destroying the wonderful world of Equestria, Celestia sends in an A team to hold down the world for the three years the portal will remain open.

Link for picture: http://browse.deviantart.com/?qh=&section=&q=shadowmares#/d4j9fwu
I did not make it, all credit for the picture goes to aeroyTechyon-X on deviantart.

Princess Peach Toadstool of the Mushroom Kingdom has come to Equestria on important diplomatic business, bringing with her the superstars of the Mushroom Kingdom, Mario and Luigi. But, when Discord is released, and aids Bowser's forces in invading Equestria and kidnapping Peach, Celestia, and Luna, Twilight and her friends must work together with Mario and Luigi on an adventure spanning two kingdoms, to rescue the princesses, defeat Bowser and Discord, and return Equestria and the Mushroom Kingdom to their former glory.