I Know What You Did Last Summer is a 1997 horror/ slasher film starring Sarah Michelle Gellar, Ryan Phillippe, Freddie Prinze, Jr. and Jennifer Love Hewitt. The screenplay was written by Kevin Williamson, writer of Scream, and very loosely based on a popular novel of the same title by Lois Duncan. The film was followed by the sequels, I Still Know What You Did Last Summer and the straight-to-DVD I'll Always Know What You Did Last Summer. The film received mixed reviews from critics. However, the film was a highly successful, grossing $125,500,000 at the box office. It was also nominated for and won multiple awards. As a result, the film has been heavily parodied and referenced in popular culture.