i know what you did last summer movies in order

The "I Know What You Did Last Summer" movies in order of their release are:

1. I Know What You Did Last Summer (1997)
2. I Still Know What You Did Last Summer (1998)
3. I'll Always Know What You Did Last Summer (2006) - a standalone sequel with a new cast
4. I Know What You Did Last Summer (2025) - a legacy sequel that picks up decades after the second film

Additionally, there is a 2021 TV series titled "I Know What You Did Last Summer" which is set in its own continuity separate from the movies. The recommended watch order for movies mainly depends on whether you include the 2006 standalone sequel or the 2025 legacy sequel as they belong to different timelines branching after the second film. The most straightforward chronological order for the original timeline is:

• I Know What You Did Last Summer (1997)
• I Still Know What You Did Last Summer (1998)
• I'll Always Know What You Did Last Summer (2006)

For the new timeline including the 2025 sequel (ignoring the 2006 film):

• I Know What You Did Last Summer (1997)
• I Still Know What You Did Last Summer (1998)
• I Know What You Did Last Summer (2025)

The TV series stands alone and can be watched independently at any point.