TV I Know What You Did Last Summer - Season 1 Episode 1 : It's Thursday I Know What You Did Last Summer - Season 1 Episode 1 : It's Thursday 6.4/10 by 227 users Lennon Grant returns home after her first year at college and discovers that someone knows the terrible secret she and her OG crew of friends swore to keep last summer. Details Casts Posters Images Title I Know What You Did Last Summer - Season 1 Episode 1 : It's Thursday Alternative Titles First Air Date 2021-10-14 Last Air Date 2021-11-11 Number of Episodes 8 Number of Seasons 1 Genres Mystery, Drama, Networks Prime Video, Casts Madison Iseman, Bill Heck, Brianne Tju, Zeke Goodman, Ashley Moore, Fiona Rene, Cassie Beck, Brooke Bloom Plot Keywords , Lennon / Alison Madison Iseman Bruce Bill Heck Margot Brianne Tju Dylan Zeke Goodman Riley Ashley Moore Lyla Fiona Rene Courtney Cassie Beck Clara Brooke Bloom Episodes List I Know What You Did Last Summer Season 1 :Episode 1 It's Thursday It's Thursday 2021-10-14 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 2 It's Not Just for Dog Shit It's Not Just for Dog Shit 2021-10-14 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 3 A Gorilla Head Will Not Do A Gorilla Head Will Not Do 2021-10-14 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 4 Hot Shrimp Salad Hot Shrimp Salad 2021-10-14 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 5 Mukbang Mukbang 2021-10-21 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 6 Least You Had a Spare Least You Had a Spare 2021-10-28 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 7 If Only Dogs Could Talk If Only Dogs Could Talk 2021-11-04 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member... I Know What You Did Last Summer Season 1 :Episode 8 Your Next Life Could Be So Much Happier Your Next Life Could Be So Much Happier 2021-11-11 In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member...