Based on the existing film franchise, there is no official spin-off of I Know What You Did Last Summer. Instead, the series comprises a set of sequels that continue the story or introduce new characters within the established horror premise.
Understanding Sequels vs. Spin-offs
It's important to distinguish between a sequel and a spin-off:
- Sequel: A film that continues the narrative of a previous film, often featuring the same main characters or a direct progression of the story. The I Know What You Did Last Summer series primarily consists of sequels.
- Spin-off: A new story, series, or film that is derived from an existing work, focusing on a character or element that was previously a minor part of the original. For example, a new film focusing on one of the side characters from the original movie would be considered a spin-off.
Films in the I Know What You Did Last Summer Franchise
The I Know What You Did Last Summer franchise includes the following films, which are considered direct continuations or standalone sequels:
| Film Title | U.S. Release Date | Story By |
|---|---|---|
| I Know What You Did Last Summer | October 17, 1997 | Kevin Williamson |
| I Still Know What You Did Last Summer | November 13, 1998 | Trey Callaway |
| I'll Always Know What You Did Last Summer | August 15, 2006 | Michael D. Weiss |
| Untitled fourth film | July 18, 2025 | Jennifer Kaytin Robinson & Leah McKendrick |
Each of these films, while expanding on the universe, follows the traditional sequel format rather than diverting into a spin-off storyline centered on a new character or distinct plotline from the main premise.
