The 2020-related cast for "I Know What You Did Last Summer" includes two different productions:
- The 2021 Amazon Prime Video TV series (teen slasher show), with main cast members:
- Madison Iseman as Allison/Lennon (twins)
- Brianne Tju as Margot
- Ezekiel Goodman as Dylan
- Ashley Moore as Riley
- Sebastian Amoruso as Johnny
- Bill Heck as Bruce
- Plus several supporting actors.
- The 2025 "I Know What You Did Last Summer" movie reboot/sequel cast announced in 2024 includes:
- Madelyn Cline as Danica
- Chase Sui Wonders as Eva
- Jennifer Love Hewitt as Julie James (original role reprise)
- Freddie Prinze Jr. as Ray Bronson (original role reprise)
- Gabbriette Bechtel as Tyler
- Nicholas Alexander Chavez, Jonah Hauer-King, Tyriq Withers, Sarah Pidgeon, Billy Campbell, Austin Nichols, Lola Tung, among others.
If you meant the TV series cast from 2020/2021, the list is the first one above. For the newer film project linked to 2020 in development but releasing in 2025 with returning original stars and new actors, the second list applies. Please specify if you want full detailed cast info for either or both versions.