[3] He approached his Blade: Trinity co-star Ryan Reynolds for the Wally West role,[2] with the intention of also using Barry Allen as a supporting character.

[4] Goyer's script, which he tonally compared to Sam Raimi's work on the first two movies of the Spider-Man trilogy,[2] was influenced by seminal comic book runs by Mike Baron, Mark Waid, and Geoff Johns.

[13] Warner Bros. brought Batman producer Charles Roven aboard, with comic book writer Geoff Johns serving as a consult and co-writer.

In the interview, Roven explained that he was involved but that he was removed from the project because The Flash was speeding in the direction Warner Bros. had in mind, leaving the possible film in uncertainty.

[19] However, the Flash project had been renamed 'Flashpoint' and has tentatively been moved to an unspecified 2020 release date but possibly even later making it, at a minimum, the eleventh installment of the DC Extended Universe instead of the sixth.

He first appears in a nightmare sequence showing up in the Batcave, wearing a futuristic armor version of his classic costume, in order to warn Bruce Wayne of an upcoming threat.

Although the scene is left for interpretation, with Flash stating that Lois is the key and that Bruce was right about "him" mixed in with a frustrated realization that he is "too soon", it indicates a possible post-apocalyptic future which the character is trying to prevent.

Miller reprised their role in Suicide Squad, in a flashback where he is shown easily apprehending George "Digger" Harkness / Captain Boomerang.

As Barry is running back to Steppenwolf's base to give Victor what he needs to prevent the unity he is knocked out of his speed force having been shot in the leg and wounded by a Parademon.

However, Barry heals his wound and then reverses time to just before the Mother Boxes were unified giving the Justice League a second chance to defeat Steppenwolf - which is successful.

At the end of the Snyder Cut, the Flash is shown along with Cyborg, Batman, Deathstroke, Mera of Alantis and the Joker in Bruce Wayne's dream of a post-apocalyptic future where Superman has become an agent of Darkseid after the death of Lois Lane.

[60][61] In January 2021, Cyborg was written out of the movie, due to Ray Fisher refusing to work on any project with DC Films president, Walter Hamada.

[64] Later that month, Maribel Verdú had been cast as Nora Allen, Barry's mother, and Crudup was forced to depart from the project to scheduling conflicts with The Morning Show, with the role being recast with Ron Livingston.

[69] In December 2021, Michael Shannon and Antje Traue were revealed to be reprising their roles from Man of Steel (2013) as General Zod and Faora-Ul, respectively.

Barry Allen appears in Lego Batman: The Movie - DC Super Heroes Unite, an adaptation of the video game of the same name, with Charlie Schlatter reprising his role.

Barry Allen appears in Lego DC Comics Super Heroes: Justice League: Attack of the Legion of Doom, with James Arnold Taylor reprising the role.

Barry Allen appears in Lego DC Comics Super Heroes: Justice League: Cosmic Clash, with James Arnold Taylor reprising the role.

[76] Barry Allen appears in the film Lego DC Comics Super Heroes: The Flash, with James Arnold Taylor reprising the role.

The Barry Allen incarnation of Flash appears in Justice League Dark: Apokolips War, with Christopher Gorham reprising the role.

Unlike the video games and comics, Barry plays a small role, and is killed in a trap set by the Joker before the destruction of Metropolis.

The Barry Allen, Jay Garrick, and Wally West incarnations of Flash appear in Batman: The Brave and the Bold, respectively voiced by Alan Tudyk, Andy Milder, and Hunter Parrish.

[83] The Barry Allen incarnation of Flash appears in the web series DC Super Hero Girls, voiced by Josh Keaton.

The Barry Allen incarnation of Flash appears in Harley Quinn, voiced by Scott Porter in the second season and Zeno Robinson in the fourth.

Unlimited Powers was a cancelled TV pilot for CBS written by Danny Bilson and Paul De Meo, the writers of the eventual 90s Flash series.

In a story possibly inspired by Watchmen, the plot would have revolved around Barry Allen escaping a fifteen-year prison sentence suspended in animation.

Barry suspects that villains are running the world politically, and teams up with Oliver Queen's teenage daughter to recruit the now retired heroes in an attempt to stop Mahkent once and for all.

After that, Barry donned a special red prototype deep sea diving-suit from Russia designed to withstand friction and pressure, and called himself the Flash.

However, he is now using his powers to help others along with Aquaman, Green Arrow, Cyborg and later, Black Canary, this group works to stop one of Lex Luthor's evil side projects, 33.1.

The character later features prominently in the comic book continuation to the TV series with Bart meeting Garrick and facing the Black Flash resulting in his death, thrusting Jay back in the role as mentor to younger heroes called "Titans".

By doing so, it allowed the creative team to flesh out the Flash's story and his world on a bigger budget, instead of being constrained to incorporating Arrow characters within a backdoor pilot.