In the Netherealm in the temple where you have to beat Quan Chi within 30 seconds. If you go to the right, and down a small corridor there will be a chest, and a skeleton, and a platform out in the lava. Get to where you can see the platform, and meditate to the time slot of 7PM-10PM or it is 7AM-10AM and every time, Johnny Cage and a mystery warrior appear facing each other on the platform. Who is this other guy? Could it be Kochal?