Just thought I would share something I recently came across. Its called Mortal Kombat 4.5 and 4.7 which is bascially a game hack of various versions of Mk ( 1-2-3-4-5) all compiled with new characters varioations and powers.
Some of the character variations are a little weak but you will find your self still smiling at the inent.This is bascially a dream for any hardcore MK fans. I can tell you first hand it plays incredibly well. The 2 on 2 team battles are insain. FYI this is a non profit mod created for fanboys.
some videos of game play