The Flash (2014– )
14 user 11 critic

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

Plot Keywords:

kid flash character | See All (1) »


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?


When he is face-to-face with Killer Frost (Danielle Pannebaker), Julian (Tom Felton) has a lighting-bolt scar on his forehead, much like Harry Potter. Tom Felton played Draco Malfoy in the Harry Potter film series. 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 »


Barry Allen: Caitlin? It's me.
Killer Frost: Barry Allen...
Barry Allen: I'm...
Killer Frost: From the past. I can tell. There's no hate in your eyes... yet. So to what we owe the pleasure of your visit? Come to see how things turned out for Team Flash?
Barry Allen: I wanted to see what happened to my friend.
Killer Frost: I am not your friend, Flash.
Barry Allen: I'm so sorry I did this to you. I should have saved you.
Killer Frost: I'm glad that you did this to me.
Barry Allen: Caitlin wasn't. I failed her. But I won't when I go back. I'm gonna find you. I'm gonna help you.
Killer Frost: You're no match for the God of Speed.
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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

great episode but note
10 May 2017 | by glenn-whitelawSee all my reviews

First off did Barry travel to 2025. He speaks to future Barry and they both confirm the speedforce device was made four years after the death of iris. 2021 then mention another 4 years space between them. Anyhoo great episode. And just a note I haven't watched next episode so just gonna say remember the episode where Ronnie disappears at the end of season 1 that's why I think at this time that Ronnie is savitar.

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