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Dean consents to being Michael's vessel in [[5.18 Point of No Return]]; as Michael begins to appear, Dean reneges and kills [[Zachariah]]. He tells Sam that he changed his mind because he didn't want to let him down. Their half-brother [[Adam Milligan]] is taken as the vessel instead.
In [[13.23 Let the Good Times Roll]] Dean
consent's to being Michael's vessel in order to battle Lucifer. He demands that he remain in control, but after Lucifer is Killed, Michael takes over Dean.