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. Sonic.exe levitates towards Robotnik as a giant spring crushes the hedgehog, the zone starts to warp as Sonic.exe spins around, the red ring is then forced out of his body and taken away by Mania Sonic, as Sonic.exe turns back into Sonic and travels back to the past, the Green Hill Zone is restored, and all of his friends are now alive.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. Sonic spin-dashes Sonic.exe away as Robotnik orders Metal Sonic and the Hard Boiled Heavies to destroy Sonic.exe as he teleports to him, Robotnik retreats and his badniks attempt to kill Sonic.exe, with all of them being destroyed in the process. Sonic.exe dashes at Sonic but he manages to avoid it, he races after Sonic.exe who tries to catch up with Robotnik, but is stopped when Sonic attempts to attack him. Robotnik through the Marble Zone until the zone turns red.
Meanwhile in the future during the events of Sonic Mania, Sonic is chasing Dr. Knuckles gets angry and tries to attack Sonic.exe, but he teleports all around him, eventually creating two illusions to scare Knuckles as he falls to the ground crying, Sonic.exe then murders him as he continues his rampage. Eventually comes across Sonic.exe, he asks him if he killed Tails, all Sonic.exe could do is laugh. Meanwhile in Scrap Brain Zone, Knuckles is wondering around until he finds the body of Tails, he runs off to find the murderer, he starts sweating as the zone warps around him. As Tails is trying to find a way off the island he is pursued by Sonic.exe, who eventually catches up to him, Tails lies on the floor crying until he looks up at Sonic.exe, his last words were "Sonic!" before being murdered by the hedgehog. Later, Tails arrives and looks for Sonic, but can only find the corpses of the animals he has killed, eventually he finds Sonic and is happy to see him until Sonic opens his eyes, Tails tries to run away as he is transported to a demonic version of the current zone. While exploring Green Hill Zone, Sonic comes across a mysterious red ring, he goes to touch it and screams when the ring is forced inside his body and brainwashes him.