SDCC 2011: The Vampire Diaries Season 3 Trailer! Get your first look at the upcoming season of the CW show which airs September 15th. Brian B. — July 22, 2011 in Movie News Facebook Twitter Reddit Email Comment The CW unveiled the season 3 trailer for The Vampire Diaries down here at Comic-Con today. You can catch the premiere of the new season on September 15th. Check out the trailer below! The Vampire Diaries - Season Premiere, Thursday Sept. 15 at 8/7c. RELATED: Arrow, The 100, Flash, Supernatural & More Renewed at The CW Topics: Vampire Diaries, Comic-Con Brian B.