MX or PC Port MX is the main antagonist in the Creepypasta game Mario '85, which is based on the original 1985 Super Mario Bros. game.

He's an ancient spirit who inhabited a copy of Super Mario Bros. and disguised himself as a monstrous eyeless version of Mario himself in order to lure unsuspecting players/victims into the game and play with for all eternity. He is Lucas' arch-nemesis, his first and only victim, of whom he killed and pulled his soul into his digital hellish dimension.