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The Vampire Diaries S02E17, Know Thy EnemyS02E17

The Vampire Diaries · Season 2

The Vampire Diaries season 2 episode 17: Know Thy Enemy

Aired 7 April 201143 minRated TV-14

8.2TMDB · 18 votesMark watched

Where to watch The Vampire Diaries Season 2 in Australia

The Vampire Diaries season 2 is streaming in Australia on Prime Video (subscription), HBO Max (subscription) and Stan (subscription), and free on 9Now. You can also buy it on Apple TV from $29.99.

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Availability checked 16 November 2026.

What happens in “Know Thy Enemy”

Elena and Alaric both lash out at John when Isobel’s unexpected arrival leaves Jenna devastated. Bonnie works with Damon and Jeremy to find the spell they’ll need to harness her ancestors’ power. A heartbroken Caroline doesn’t know what to do about Matt. Stefan and Damon realize they have a new secret weapon.

Episode summary: TMDB.

Before you watch

  • It is episode 17 of 22 of season 2, so watch episodes 1 to 16 first.
  • It runs about 43 minutes.
  • Directed by Wendey Stanzler.
  • TMDB users rate it 8.2 out of 10 (18 votes).

The Vampire Diaries trailer

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

The Vampire Diaries trailerPlay video: The Vampire Diaries trailer

Cast and crew of this episode

Director
Wendey Stanzler
Guest stars
Mia Kirshner as Isobel FlemmingBryton James as Luka MartinMichael Roark as CowboySusan Walters as Carol LockwoodMarguerite MacIntyre as Sheriff Liz ForbesDavid Anders as John GilbertGino Anthony Pesi as Maddox

Credits: TMDB.

More from The Vampire Diaries Season 2

Previous · S02E16The House Guest24 February 2011Next · S02E18The Last Dance14 April 2011
  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

Every episode of Season 2The Vampire Diaries 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.