Dexter Season 7 Trailer! Dexter returns for season 7 with all-new episodes starting September 30th at 9PM ET/PT. B. Alan Orange — May 29, 2012 Facebook Twitter Reddit Email Comment Dexter is set to return on September 30th with the Season 7 premiere Doakes Return. We have your first look at Showtime's hit drama series with the Season 7 trailer. Watch and prepare yourself for another bloody run of all-new episodes.