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Supernatural S10E21, Dark DynastyS10E21

Supernatural · Season 10

Supernatural season 10 episode 21: Dark Dynasty

Aired 6 May 201543 minRated TV-14

7.6TMDB · 35 votesMark watched

Where to watch Supernatural Season 10 in Australia

Supernatural season 10 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 “Dark Dynasty”

Dean and Sam investigate a bizarre murder and realize the killer bears the same tattoo as those from the Styne family. Meanwhile, Castiel acts as referee when Charlie and Rowena are forced to work together on the Book of the Damned. When Crowley discovers that his mother is missing, he turns to an old enemy for help.

Episode summary: TMDB.

Before you watch

  • It is episode 21 of 23 of season 10, so watch episodes 1 to 20 first.
  • It runs about 43 minutes.
  • Directed by Robert Singer, written by Eugenie Ross-Leming and Brad Buckner.
  • TMDB users rate it 7.6 out of 10 (35 votes).

Supernatural trailer

The official trailer for the series (no preview of this episode has been published).

Supernatural trailerPlay video: Supernatural trailer

Cast and crew of this episode

Director
Robert Singer
Writers
Eugenie Ross-LemingBrad Buckner
Guest stars
David Hoflin as Eldon StyneMarkus Flanagan as Monroe StyneMatt Bellefleur as Eli StyneRyan Dumontel as Minion #1Lee Shorten as Minion #2Mackenzie Murdock as Demon VictimHaigan Day as Eileen MacCormackRobert Egger as Office Manager

Credits: TMDB.

More from Supernatural Season 10

Previous · S10E20Angel Heart29 April 2015Next · S10E22The Prisoner13 May 2015
  1. E01
  2. E02
  3. E03
  4. E04
  5. E05
  6. E06
  7. E07
  8. E08
  9. E09
  10. E10
  11. E11
  12. E12
  13. E13
  14. E14
  15. E15
  16. E16
  17. E17
  18. E18
  19. E19
  20. E20
  21. E21
  22. E22
  23. E23

Every episode of Season 10Supernatural 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.