Drama · Horror

I Know What You Did Last Summer: all seasons, episodes and where to watch

Prime Video drama and horror series (2021–2021), 1 season.

Season complete Prime Video Listings updated October 7, 2026 Listings

Quick answer · Season 1

I Know What You Did Last Summer is a drama and horror series from Prime Video, running from 2021 with 1 season and 8 episodes. I Know What You Did Last Summer has ended. Its final episode aired on November 12, 2021.

U.S. premiere: October 15, 2021
Where: Prime Video
Time: Not announced
Episodes: 8
Finale: November 12, 2021

📖 Based on a book: I Know What You Did Last Summer is based on I Know What You Did Last Summer by Lois Duncan. See the book and reading order →

Where to watch I Know What You Did Last Summer season 1 in the U.S.

Where to watch I Know What You Did Last Summer season 1 in the U.S.
Where	How	When	Notes
Prime Video	Streaming, weeklySubscription	October 15, 2021 – November 12, 2021	Prime Video original. [1]

Season 1 episode schedule

I Know What You Did Last Summer season 1 U.S. episode schedule
Ep.	Title	U.S. date	Time	Status
1	It's Thursday	Fri, Oct 15, 2021 ^[1]	Time not announced	Listed
2	It's Not Just For Dog Shit	Fri, Oct 15, 2021 ^[1]	Time not announced	Listed
3	A Gorilla Head Will Not Do	Fri, Oct 15, 2021 ^[1]	Time not announced	Listed
4	Hot Shrimp Salad	Fri, Oct 15, 2021 ^[1]	Time not announced	Listed
5	Mukbang	Fri, Oct 22, 2021 ^[1]	Time not announced	Listed
6	Least You Had A Spare	Fri, Oct 29, 2021 ^[1]	Time not announced	Listed
7	If Only Dogs Could Talk	Fri, Nov 5, 2021 ^[1]	Time not announced	Listed
8	Your Next Life Could Be So Much Happier	Fri, Nov 12, 2021 ^[1]	Time not announced	Listed

Dates are U.S. dates. Broadcast times are the network's national slot; your local station may differ.

About I Know What You Did Last Summer

Season 1: Season 1 of I Know What You Did Last Summer aired from October 15, 2021 to November 12, 2021 on Prime Video (8 episodes).

Network / service: Prime Video (first aired October 15, 2021)
Official site: amazon.com
Main cast over the series (TVmaze): Madison Iseman (Allison Grant), Brianne Tju (Margot Gilbert), Fiona Rene (Lyla Kalei), Ashley Moore (Riley Thacker), Bill Heck (Bruce Grant)

Common questions

How many seasons of I Know What You Did Last Summer are there?

I Know What You Did Last Summer has 1 season and 8 episodes listed, airing from October 15, 2021 to November 12, 2021.

Is I Know What You Did Last Summer cancelled or ended?

I Know What You Did Last Summer has ended. Its final episode aired on November 12, 2021.

Where can I watch I Know What You Did Last Summer?

I Know What You Did Last Summer is Prime Video's own series, so every season streams on Prime Video. Included with Amazon Prime or as a standalone Prime Video subscription.