This won't be like the recent video games, and won't involve the main characters, though it will be the story of the first game and movie.
Great fighters from around the world have been invited to participate in Mortal Kombat, all driven by their own unique motives, whether it be fame and glory, chasing down a rival, simply seeking a challenge or proving to the world they are the real deal.
The tournament tales place on an Island cut off from the world every 100 years, and is the battle ground for several dimensions, all seeking control of Earth Realm. The portals needed for an invasion of Earth are only usable by whoever wins this tournament, so Earths warriors must secure a victory.
Make any kind of unique human/monster/anything in between :) this will be more light hearted then Mortal Kombat, with many of the fights to knock out instead of death. If everyone would prefer, they can make this a more anime style game, with teens in the tournament.
You'll be given 3 tiny bones at the start of the tournament, and will need to have 10 to advance, which can only be done by better them on fights. This will free form, with me handling the fight scenes much like a DM.