This is a tool-assisted speedrun. Watch how it looks like when a real tool-assisted speedrun master is getting mad in the probably most violant fighting game. Impressive combos and no enemy got any chance to hit him only once.
From Wikipedia:
Mortal Kombat Trilogy is a fighting game developed and published by Midway in 1996. It is a compilation of content from the previous Mortal Kombat titles, based primarily upon the gameplay mechanics of Ultimate Mortal Kombat 3. Trilogy follows the same story as UMK3, but contains all characters and most of the stages from Mortal Kombat and Mortal Kombat II as well.
Learn about Mortal Kombat Trilogy