The Vampire Diaries is an American supernatural–fantasy horror television series developed by Kevin Williamson, based on the book series of the same name by L. J. Smith. The series follows the life of Elena Gilbert (Nina Dobrev), who falls in love with vampire Stefan Salvatore (Paul Wesley), and soon finds herself caught in a love triangle between Stefan and his older brother, Damon (Ian Somerhalder), while the brothers are also being haunted by the past they've had with Katherine Pierce (also played by Nina Dobrev).