S04E21Supernatural season 4 episode 21: When the Levee Breaks
Aired 7 May 200943 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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Availability checked 16 November 2026.
What happens in “When the Levee Breaks”
Dean and Bobby have something frightening locked in Bobby's panic room: Sam, who is corrupted by demon blood. With the apocalypse drawing nearer, Bobby wants to free Sam to fight on their side.
Episode summary: TMDB.
Before you watch
- It is episode 21 of 22 of season 4, so watch episodes 1 to 20 first.
- It runs about 43 minutes.
- Directed by Robert Singer, written by Sera Gamble.
- TMDB users rate it 8.1 out of 10 (40 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
- Robert Singer
- Writer
- Sera Gamble
- Guest stars
- Misha Collins as CastielColin Ford as Young Sam WinchesterJulie McNiven as Anna MiltonChristopher Heyerdahl as AlastairJuliana Wimbles as Demon NurseJoey Bothwell as NurseGenevieve Padalecki as RubySamantha Smith as Mary Winchester
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.