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 the hero his future friends have been waiting for. Meanwhile, back in 2017, the hunt for Killer Frost continues.
While Team Flash must now deal with an escaped Killer Frost, Barry travels to 2024 in order to find out Savitar's identity.
Barry learns from Cisco that future Barry disbanded Team Flash after Iris' death and much has changed: Cisco lost his vibe powers after Killer Frost shattered his hands, H.R. is a romantic novel writer, Julian works at Iron Heights where he holds Killer Frost in a cell, Wally is in a catatonic state after Savitar shattered his spine, Joe has become depressed and bitter since Barry broke his promise to always be there for them if Iris died and Barry has become a recluse hiding in the remnants of S.T.A.R. Labs.
In his absence, Sam Scudder and Rosalind Dillon have taken over Central City.
Barry fails to learn Savitar's identity from Future Barry and Killer Frost, who has had an alliance with Savitar ever since her powers returned.
Cisco uses a device to prevent Barry from returning to the past, not wanting to be left alone again.
Barry rounds up Julian, Joe and H.R., apologizing to them for breaking his promise in the future and Iris wouldn't have wanted them to stop being a family, effectively reuniting Team Flash in the future.
Scudder and Dillon overwhelm Barry with their powers but Future Barry, having overheard their conversation, helps out by giving Cisco's device to Barry in order to negate Scudder and Dillon's ability.
Future Barry gives Barry a device for a speed force trap and tells him to find a physicist named Tracy Brand, who created the device four years after Iris' death.
Killer Frost meets with Savitar, who offers her the chance for Caitlin Snow to never return.
She is reluctant until Savitar steps out of the suit and reveals himself to her. Killer Frost looks at the person in awe as the screen fades to black...
To be continued...
- The title is a nod to an infamous inscription purported to be on the tomb of the legendary King Arthur in Le Morte d'Arthur by Sir Thomas Malory.
- While hiding from Killer Frost, H.R. and Cisco sing "Swing Low, Sweet Chariot", a negro spiritual popularized by Eric Clapton.
- it is revealed that Killer Frost in the battle that Cisco vibed earlier in the season in the conclusion of the battle, manages to take Cisco's hands, which end his powers. His hands are now bionic.
- Killer Frost learns who Savitar is after he steps out of his suit... her reaction cements their alliance, although we the viewer do not her him or see him.... the mystery continues.... to who is Savitar... one thing for sure Killer Frost recognises him as a familiar face....
|The Flash season 3|
|"Flashpoint" • "Paradox" • "Magenta" • "The New Rogues" • "Monster" • "Shade" • "Killer Frost" • "Invasion!" • "The Present" • "Borrowing Problems from the Future" • "Dead or Alive" • "Untouchable" • "Attack on Gorilla City" • "Attack on Central City" • "The Wrath of Savitar" • "Into the Speed Force" • "Duet" • "Abra Kadabra" • "The Once and Future Flash"|
|"I Know Who You Are" • "Cause and Effect" • TBA • TBA|