Changes

Upon arrival in the Winchesters' world, Michael begins to experiment with monsters, enhancing their abilities and making them invulnerable to conventional methods of death. After trial and error, Michael manages to refine the process. He makes deals with dozens of monsters, motivating them to kill as many hunters as possible. Soon, he tries to turn the entire town of Kansas City, Missouri to make [[Michael's Monsters|his monster army]] grow in size. Michael's original plan was to bring paradise to the Earth by wiping out the humans, keeping only as many as the monsters need for slave labour and a steady food supply, but after realizing that Chuck is a writer who throws the worlds he creates away, including his own, Michael decides to burn every single world to the ground until he catches up with God and kills him. However, Michael is imprisoned in Dean's mind for a time. When he manages to escape, Michael possesses Rowena and kills the other Apocalypse World hunters before turning his attention to the Winchesters. [[Jack Kline]] manages to use [[Enochian]] magic to exorcize Michael and kill him at the cost of burning off his soul to save Sam, Dean, and Castiel.

Sam, Dean, Castiel, and Jack discover that Chuck has been manipulating the Winchesters' lives as part of a sick story, even taking advantage of Dean's grief over Mary's death to trick him into killing Jack at the cost of his own life. When they no longer want any part of his story, Chuck kills Jack himself and opens a portal to Hell, releasing the billions of damned souls and unleashing a horde of zombies to kill the Winchesters and end the world.