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What if Crowley the demon came over into our world like in the French Mistake and possessed Mark Sheppard and then took him back to the SPN world but let’s him come back for filming and conventions? That just hurt my head.
That is exactly what’s happening. Maybe Mark even got something in exchange for letting Crowley possess him…I know that Crowley can just possess whoever he wants but maybe he made a deal with Mark so that he doesn’t get an anti-possession tattoo while he’s “away”.