The real name of the demon that infected Mario is Mephisto (also called Marphisto because of his association with Mario).Also in this comic was extremely crooked art, from which a separate offshoot appeared in the form of a meme-character, which is called Mareo.xe.In the new story, Luigi was killed, and the survivors were Daisy, Toad and Bowser Jr. The only survivors are Luigi and Toad, who were supposed to confront this demon and save the world. M.exe originally appeared in the unpublished Mushroom Kingdom Nightmare comic, in which Mario was possessed by a demonic parasite and forced to kill almost everyone in this world.He also sits inside a magenta warp pipe filled with blood.

In 'Triple Threat', M.EXE transforms into his Inferno form: He now has four skeletal arms ending in pale, clawed gloves, his ears and nose are longer, his hair and mustache are now more unkempt, The M on his chest is now wider, his mouth has more teeth than before, the buttons on his overalls are now oval-shaped, his shirt and cap are now dark red and the overalls are now indigo, his hair and mustache are now tinted red, and his cap now sports a pentagram as its emblem instead of a circular patch with a letter on it. In 'You Can't Jump'/'Water of Sins', M.EXE assumes his Poison form: He's now thinner than before, and his entire color scheme has changed, with his shirt now being black and sporting an M-shaped scar on the front, his overalls now being purple while the buttons of the overalls are now red and shaped like rhombuses, his gloves now being red, his shoes now being red and pointy at the ends, similar to the shoes worn by Wario and Waluigi, his cap now being magenta and sporting an X on the emblem instead of an M, his skin now being pale, and his hair being tinted purple. M.EXE starts out looking like a taller, more demented version of Mario with pointy ears, unkempt hair and mustache, black eyes with glowing red pupils and blood leaking out of them, and a mouth full of sharp teeth. He's the opponent of the Story Mode, facing off against either Sonic.Exe or Boyfriend. M.EXE is the mod creator's take on Mario.Exe and the main antagonist of Nightmare Of The Mushroom Kingdom.

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