Preview Clip of Grey's Anatomy Season 8, Episode 19: Mark In Charge (VIDEO) Tweet April 9, 2012 by Rebecca Martin Related: Grey's Anatomy, Season 8 Episode 19 , Sneak Peeks , Derek Shepherd , Jackson Avery , Mark Sloan , Miranda Bailey , Season 8 Credit: ABC © 2012 Disney ABC Television Group Air date: April 12, 2012. Mark gets a temporary promotion on Grey's Anatomy Season 8, Episode 19: “Support System.”
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