The Flash (2014– )
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The Once and Future Flash 

Barry travels forward in time to 2024 to find out Savitar's identity and save Iris' life.


Tom Cavanagh


Greg Berlanti (developed by), Andrew Kreisberg (developed by) | 4 more credits »

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Episode complete credited cast:
Grant Gustin ... Barry Allen / The Flash
Candice Patton ... Iris West
Danielle Panabaker ... Killer Frost
Carlos Valdes ... Cisco Ramon / Vibe
Keiynan Lonsdale ... Wally West / Kid Flash
Tom Cavanagh ... H.R. Wells
Jesse L. Martin ... Joe West
Tom Felton ... Julian Albert
Grey Damon ... Sam Scudder / Mirror Master
Ashley Rickards ... Rosalind Dillon / Top
Andre Tricoteux ... Savitar
Makara Adkins Makara Adkins ... Another Woman
Kathryn Coutu Kathryn Coutu ... Woman
Jonathan Glasgow Jonathan Glasgow ... Newscaster Kline
Carmela Sison Carmela Sison ... Nurse Beth


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, folllowing 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 the hero his future friends have been waiting for. Meanwhile, back in 2017, the hunt for Killer Frost continues.

Plot Summary | Add Synopsis


TV-PG | See all certifications »






Release Date:

25 April 2017 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
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Did You Know?


Iris West was born on June 24, 1989. This is exactly one year after Candice Patton's real life date of birth. See more »


When Barry is in 2024, he refers to himself as being from 2017, but when he gets home and HR asks when he went to, he says eight years into the future. See more »


Cisco Ramon: Hey, Julian, how about next time you decide to release my friend's inner ice demon, you do it sometime in July?
Julian Albert: I know you're not being serious. I was trying to save her life, Cisco.
Cisco Ramon: Iris was right. Even H.R. was right. We should've taken her to a hospital.
Julian Albert: Brilliant idea, yes. Expose her meta-human status to the world. That would've been great, wouldn't it?
Cisco Ramon: Hey, guess what? She's gonna do that anyway.
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References Back to the Future (1985) See more »


The Flash Theme
Written by Blake Neely
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User Reviews

Future Flash!!!
10 September 2018 | by BatmanFunReviews2018See all my reviews

Barry travels forward in time to 2024 to find out Savitar's identity and save Iris' life. The Once and Future Flash was directed by Tom Cavanagh who did such a terrific job with the finished product. I mean Grant Gustin did a terrific job as both Barry Allen from 2017 and Barry Allen from 2024 plus clever writing with the right amount of drama and humor which the show is known of having and doing a really good job with. Plus loved the fact that 2 previous Season 3 villains returned i mean it was a very good and nice idea to bring them back for more.

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