Zach Roerig discusses the relationships Matt has with his sister Vicki and ex-girlfriend Elena. The Vampire Diaries Video: Watch the Vampire Diaries full episodes, previews, clips, interviews and more video. Two vampire brothers - one good, one evil - are at war for Elena’s soul in the small town of Mystic Falls, Virginia. Based on the series of books by L. J. Smith. CAST: Nina Dobrev Paul Wesley Ian Somerhalder Steven R. McQueen Sara Canning Katerina Graham Candice Accola Zach Roerig Kayla Ewell Michael Trevino Chris William Martin