As one of the most successful fantasy franchises of this century, Harry Potter has had a significant impact on the film industry, helping redefine blockbusters in Hollywood. The wizarding universe began in 2001 with the first installment in the film series, Harry Potter and the Philosopher's Stone (or Sorcerer's Stone for American audiences), an adaptation of the 1997 book of the same name. Seven more films followed, all adaptations, which have made up one of the highest-grossing film series of all time.