S04E09Supernatural season 4 episode 9: I Know What You Did Last Summer
Aired 13 November 200843 minRated TV-14
Where to watch Supernatural Season 4 in Australia
Supernatural season 4 is streaming in Australia on Prime Video (subscription), HBO Max (subscription) and Stan (subscription). You can also buy it on Apple TV from $29.99.
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Buy from $29.99 a season
Availability checked 16 November 2026.
What happens in “I Know What You Did Last Summer”
What happened to Sam during the months Dean was dead? During the search for a girl named Anna Milton, who has a mysterious connection to angels, Sam reveals the astonishing events of the summer.
Episode summary: TMDB.
Before you watch
- It is episode 9 of 22 of season 4, so watch episodes 1 to 8 first.
- It runs about 43 minutes.
- Directed by Charles Beeson, written by Sera Gamble.
- TMDB users rate it 8.2 out of 10 (44 votes).
Supernatural trailer
The official trailer for the series (no preview of this episode has been published).
Play video: Supernatural trailer
Cast and crew of this episode
- Director
- Charles Beeson
- Writer
- Sera Gamble
- Guest stars
- Misha Collins as CastielJulie McNiven as Anna MiltonGwynyth Walsh as PsychologistAnna Williams as Blonde RubyDrew Nelson as Crossroads DemonMark Rolston as AlastairDave Collette as Orderly DemonShawn Hall as Pool Player
Credits: TMDB.
More from Supernatural Season 4
Every episode of Season 4Supernatural episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.