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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Stream (subscription)
Watch now on Prime VideoPrime Video
Subscription
$12.99/mth (Amazon Prime Monthly plan)
Stream now on HBO MaxHBO Max
Subscription
From $11.99/mth
Watch now on StanStan
Subscription
From $9.99/mth
Free
Watch 9Now on 9Now9Now
Free with ads
Buy or rent
Stream now on Apple TVApple TV
Buy
Buy from $29.99 a season
Get Fetch on Fetch TVFetch TV
Buy
Buy from $29.99 a season
Rent or buy on Prime Video StorePrime Video Store
Buy
Buy from $27.99 a season
Availability checked 16 November 2026.
What happens in “Invasion! (II)”
When aliens called the Dominators attack Central City, Barry speeds over to Star City to ask the Green Arrow for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco create a breach to bring back a secret weapon – Supergirl. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust. Meanwhile, Wally wants to join the battle against the aliens but Iris tells him he’s not ready. The crossover starts on Supergirl S02E08 Medusa (I). It continues on Arrow S05E08 Invasion! (III) and DC's Legends of Tomorrow S02E07 Invasion! (IV).
Episode summary: TMDB.
Before you watch
- It is episode 8 of 23 of season 3, so watch episodes 1 to 7 first.
- It runs about 41 minutes.
- Directed by Dermott Downs, written by Andrew Kreisberg, Greg Berlanti, Todd Helbing and Aaron Helbing.
- TMDB users rate it 7.8 out of 10 (51 votes).
The Flash trailer
The official trailer for the series (no preview of this episode has been published).
Play video: The Flash trailer
Cast and crew of this episode
- Director
- Dermott Downs
- Writers
- Andrew KreisbergGreg BerlantiTodd HelbingAaron Helbing
- Guest stars
- Emily Bett Rickards as Felicity SmoakDominic Purcell as Mick Rory / Heat WaveFranz Drameh as Jefferson 'Jax' Jackson / FirestormChristina Brucato as Lily SteinJerry Wasserman as PresidentMelissa Benoist as Kara Danvers / SupergirlCaity Lotz as Sara Lance / White CanaryAudrey Marie Anderson as Lyla Michaels
Credits: TMDB.
More from The Flash Season 3
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.



