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The Flash S04E22, Think FastS04E22

The Flash · Season 4

The Flash season 4 episode 22: Think Fast

Aired 15 May 201841 minRated TV-PG

7.6TMDB · 33 votesMark watched

Where to watch The Flash Season 4 in Australia

The Flash season 4 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 $24.99.

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Free

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Availability checked 16 November 2026.

What happens in “Think Fast”

When DeVoe assaults an A.R.G.U.S. facility to complete his Enlightenment Machine, Barry realizes the only way he can stop him is if he allows Cisco and Caitlin to accompany him into the facility. Still shaken by Ralph’s death, Barry isn’t sure he wants to risk any more of his friends’ lives and considers taking on DeVoe solo.

Episode summary: TMDB.

Before you watch

  • It is episode 22 of 23 of season 4, so watch episodes 1 to 21 first.
  • It runs about 41 minutes.
  • Directed by Viet Nguyen, written by Sam Chalsen and Kristen Kim.
  • TMDB users rate it 7.6 out of 10 (33 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
Viet Nguyen
Writers
Sam ChalsenKristen Kim
Guest stars
Danielle Nicolet as Cecile HortonPatrick Rinehart as A.R.G.U.S. GuardRyan Alexander McDonald as Neil Borman / FalloutKim Suzanne Engelbrecht as Marlize DeVoe / The MechanicDonna Pescow as Dr. Sharon FinkelVictoria Askounis as Young CaitlinAdil Zaidi as A.R.G.U.S. ScientistNathan Barrett as Pizza Dude

Credits: TMDB.

More from The Flash Season 4

Previous · S04E21Harry and the Harrisons8 May 2018
S04E23Next · S04E23We Are The Flash22 May 2018
  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 4The 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.