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Supernatural S12E21, There's Something About MaryS12E21

Supernatural · Season 12

Supernatural season 12 episode 21: There's Something About Mary

Aired 11 May 201742 minRated TV-14

7.3TMDB · 27 votesMark watched

Where to watch Supernatural Season 12 in Australia

Supernatural season 12 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 and Fetch TV from $44.99.

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Availability checked 16 November 2026.

What happens in “There's Something About Mary”

Sam and Dean are alarmed when they learn hunters are being killed by suspicious “accidents” all over the country. They decide it is best to find Mary and make sure she’s safe. Meanwhile, Toni is back in the states and she and Mary face off.

Episode summary: TMDB.

Before you watch

  • It is episode 21 of 23 of season 12, so watch episodes 1 to 20 first.
  • It runs about 42 minutes.
  • Directed by P.J. Pesce, written by Eugenie Ross-Leming and Brad Buckner.
  • TMDB users rate it 7.3 out of 10 (27 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
P.J. Pesce
Writers
Eugenie Ross-LemingBrad Buckner
Guest stars
David Haydn-Jones as Arthur KetchMark Pellegrino as LuciferElizabeth Blackmore as Toni BevellGillian Barber as Dr. HessAndrew McNee as RickAlex Barima as Lucifer's DemonSerge Jaswal as Tech #1Chelsea Gilligan as Paige

Credits: TMDB.

More from Supernatural Season 12

Previous · S12E20Twigs & Twine & Tasha Banes4 May 2017Next · S12E22Who We Are18 May 2017
  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 12Supernatural 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.