Changes

Michael first manifests when [[Sam]], Dean and Castiel have traveled back to 1978 to stop [[Anna Milton]] from killing [[John]] and [[Mary Winchester]] in order to prevent Sam’s birth, and thus his use as Lucifer’s vessel. Michael comes to John while Anna is attacking, and John consents when Michael says he can stop Anna from killing Mary. Michael incinerates Anna with a touch, and banishes [[Uriel]] back to [[Heaven]], and sends Mary to sleep. Alone with Dean, Michael explains that while Dean is his true vessel, he's not his only vessel as he can use others from Dean's bloodline. Michael tells him that his relationship with Lucifer mirrored Dean's relationship with Sam. He also tells Dean his view of the [[Apocalypse]], and the need to have a final battle. Michael believes that he is a good son who has to do what his father tells him to do because he believes it to be an absolute in any situation.

Before departingWhile Dean tries to counter him, Michael insists that everything that happened from John and Mary's birth, their union, and conceiving Sam and Dean is not random, but a pre-ordained, including the need for Dean to serve as a vesselplan playing itself out perfectly. He Michael says that Dean has no choice, that "free will is an illusion," and that is why he will eventually receive his consent, though he won't leave Dean in a catatonic state when he's done using him as a vessel. He plans to erase Mary and John's memories of meeting Sam and Dean, under the pretense of giving Mary the life she wants. While Dean protests against it because of her death in 1983, Michael says that Dean knew that Mary's death was inevitable whether she knows the truth or not. He then heals Sam, and returns the brothers to the present. He removes all memories of the events of the day from Mary and John.