I Know What You Did Last Summer: Characters I Know What You Did Last Summer Drama, Horror 10/15/21 – 11/12/21 https://www.amazon.com/Know-What-You-Last-Summer/dp/B09GPTDR4C GeneralEpisodesCastCharactersGallery Characters See all characters → Clara Whethers Courtney Thacker Margot Gilbert Riley Thacker Dylan Scanlon TBD Lennon Grant Allison Grant Margot Lyla Kalei Riley Bruce Grant Dylan Clara Courtney Johnny