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The Flash S03E19, The Once and Future FlashS03E19

The Flash · Season 3

The Flash season 3 episode 19: The Once and Future Flash

Aired 25 April 201742 minRated TV-PG

7.8TMDB · 41 votesMark watched

Where to watch The Flash Season 3 in Australia

The Flash season 3 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, Fetch TV from $29.99 and Prime Video Store from $27.99.

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Free

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Availability checked 16 November 2026.

What happens in “The Once and Future Flash”

Barry travels to the future to find out Savitar’s still unknown identity in the hopes of saving Iris. Upon his arrival in 2024, Barry encounters future versions of his Team Flash friends, who, following the death of Iris, have become very different people, profoundly impacted by their showdown with Savitar. It will be up to Barry to infuse a sense of hope back into the team, as he proves to be hero his future friends have been waiting for. Meanwhile, back in 2017, the hunt for Killer Frost continues.

Episode summary: TMDB.

Before you watch

  • It is episode 19 of 23 of season 3, so watch episodes 1 to 18 first.
  • It runs about 42 minutes.
  • Directed by Tom Cavanagh, written by Carina Adly MacKenzie.
  • TMDB users rate it 7.8 out of 10 (41 votes).

The Flash trailer

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

The Flash trailerPlay video: The Flash trailer

Cast and crew of this episode

Director
Tom Cavanagh
Writer
Carina Adly MacKenzie
Guest stars
Grey Damon as Sam Scudder / Mirror MasterMakara Adkins as Another WomanKathryn Coutu as WomanJonathan Glasgow as Newscaster KlineCarmela Sison as Nurse BethTobin Bell as Savitar (voice) (uncredited)Andre Tricoteux as SavitarAshley Rickards as Rosalind Dillon / Top

Credits: TMDB.

More from The Flash Season 3

Previous · S03E18Abra Kadabra28 March 2017Next · S03E20I Know Who You Are2 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 3The Flash 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.