If you're a slasher movie devotee, you probably know about I Know What You Did Last Summer. The 1997 movie based on Lois Duncan's novel is an iconic entry in the genre - so much so that it was followed by two movies, a TV show and now another feature film. If you're getting ready to watch the new movie, it's time to catch up on the previous content. Watch With Us is giving you the scoop on where you can watch every installment in the I Know What You Did Last Summer franchise.