Horrified, Mario.exe must try to survive from his brother's murderous attacks before his brother strikes back, but was unsuccessful. On Satan's order, Luigi, now as an EXE demon does the same things as his demonic brother by stalking him and taunting him. Satan appears again in villain mode when he betrays his right-hand Mario.exe, now an protagonist by replacing him with Luigi who is now Satan's right-hand. Luigi tries to kill Mario, but Mario vanishes in a red smoke, showing the red demonic smoke in the process, then Mario arrives with an knife to kill Luigi, in off-screen beheading him, showing his evil mission to Satan with an Game Over Logo with the dead bodies of Toad and Luigi. Luigi is positive that Mario has made an deal with Satan to become an bad killer. Mario laughs evilly and punches Princess Peach, causing her to fall to her death in the process, leaving Luigi sad and depressed, then Mario, now as an EXE demon tries to kill Luigi, but Luigi avoids it by jumping and going to the castle, then an jumpscare has been heard, showing the demonic face of Mario in the process. Worried, Luigi watches in horror that Mario is going to kill Peach by punching her falling down on the floor. When Luigi tries to go to the castle, Satan writen 'Look behind you!'. While avoiding to fall to his death, Luigi discovers the demonic text by using the demonic Mario to do bad things instead of the good things. Satan writes the satanic text and writes to Luigi 'Jump!'. Luigi went to see Toad by telling was going on, but Satan uses Mario to turn Toad into an EXE zombie to try to kill Luigi, but Luigi kills the Zombie Toad by beheading him in order to escape in the pipe to go to the next level. Luigi must avoid the poisonous Mushrooms to survive in the process, Satan uses the demonic Mario to kill Luigi with spikes, but Luigi avoids it, only to discover the mutilated bodies of Toads who got brutally killed by the demonic Mario on Satan's order. When Luigi devourse on of it, he starts to puke the blood out of his mouth and collapses, causing to restart the level in the process. Luigi finds the poisonous Mushrooms who are created by Satan and Mario wherewas corrupted by the Devil. Horrified, Luigi saw the spikes coming on him, but he eventually escapes to the pipe to find the shelter. Mario, still corrupted by Satan kills two Toads in cold blood by arsoning the Toad castle in front of Luigi by laughing evilly. Luigi then realizes that he misses his old brother too much and vows to return him back to his good self, but was unsuccessful. Under the orders of Satan, Mario, now as an EXE demon starts his killing spree by stalking his brother Luigi. Satan corrupts Mario by adding an demon inside of him, thus Mario.exe is born.

He has spiky ears with a negative behavior with sharper teeth. His appearance is a demonic spirit with red skin, spiky nails with a skull that he is able to turn a plumber into an EXE demon for his own amusement with a negative spell instead of positive spell for fun. His appearence was unseen, but it's clear he is the death god with devil horns, yellow eyes, a large grin on his face, and has the same attitude as his religious counterpart.

Mario exe wii