The 2020 "I Know What You Did Last Summer" refers to a teen slasher TV series adaptation of the 1973 novel by Lois Duncan, released on Amazon Prime Video in October 2021. It consists of one season with episodes released weekly after the initial launch and was canceled in January 2022. The series involves a group of friends stalked by a killer after covering up a deadly car accident. For the 2025 "I Know What You Did Last Summer," it is a slasher film directed by Jennifer Kaytin Robinson. It follows five friends who cover up a deadly car accident and are later stalked by a killer seeking revenge. The film was released in theaters in July 2025 and is available for purchase or rent on Amazon Video. There are currently no free streaming options listed. If looking to watch the 2020 series, check Amazon Prime Video. For the 2025 film, you can rent or buy it on Amazon Video, or look for theater showtimes. No free online streaming services are confirmed for either as of now.