Barry Allen in the context of "The Flash"

The Justice Society of America (JSA) is a superhero team appearing in American comic books published by DC Comics. It was created by writer Gardner Fox and editor Sheldon Mayer during the Golden Age of Comic Books. It first appeared in All Star Comics #3 (Winter 1940–1941), making it the first team of superheroes in comic books. Its original members were Doctor Fate, Hourman, the Spectre, Sandman, Atom, the Flash, Green Lantern and Hawkman.

The team was initially popular, but after superhero comics waned in the late 1940s, the JSA's adventures ceased with issue #57 of the title (March 1951). During the Silver Age of Comic Books, DC Comics reinvented several Justice Society members and brought many of them together in a new team, the Justice League of America. Other JSA members remained absent from comics for ten years until Jay Garrick appeared alongside Barry Allen, his Silver Age counterpart, in The Flash #123 (September 1961). The Justice Society was established as existing on "Earth-Two" and the Justice League on "Earth-One", different versions of Earth in different universes. This allowed for annual cross-dimensional team-ups of the teams between 1963 and 1985. New series, such as All-Star Squadron, Infinity, Inc., and a new All-Star Comics, featured the JSA, their children, and their heirs and explored the issues of aging, generational differences, and contrasts between the Golden Age and subsequent eras.

The Flash is a 2023 American superhero film based on the DC Comics character Barry Allen / The Flash. Directed by Andy Muschietti from a screenplay by Christina Hodson and a story by the writing team of John Francis Daley and Jonathan Goldstein alongside Joby Harold, it is the 13th film in the DC Extended Universe (DCEU). Ezra Miller stars as Barry Allen, who travels back in time to prevent his mother's death and becomes stranded in an alternate past. Sasha Calle also stars in her film debut, alongside Michael Shannon, Ron Livingston, Maribel Verdú, Kiersey Clemons, Antje Traue, and Michael Keaton. Barbara Muschietti and Michael Disco produced the film for DC Films and Warner Bros. Pictures.

Development on a film featuring the Flash began in the late 1980s, with various iterations planned through 2014, when it was redeveloped for the DCEU and Miller was cast. Multiple writers and directors were attached over the following years, with Seth Grahame-Smith, Rick Famuyiwa, Daley, and Goldstein all departing the project over creative differences with the studios. Muschietti and Hodson became involved in July 2019, and pre-production began in January 2020. Influenced by the 2011 comic book storyline Flashpoint, the film explores the multiverse and features other DC characters, such as Calle's Supergirl and multiple versions of Batman, particularly Keaton's portrayal from the films Batman (1989) and Batman Returns (1992), while others were digitally included. Filming lasted from April to October 2021 at Warner Bros. Studios Leavesden and on location throughout the United Kingdom. The film's ending was altered several times during post-production due to changes in DC's wider plans under different studio leadership.

Eobard Thawne, also known as the Reverse-Flash or Professor Zoom, is a supervillain appearing in American comic books published by DC Comics. Created by John Broome and Carmine Infantino, the character first appeared in The Flash #139 (September 1963) and has since endured as the archenemy of Barry Allen / The Flash. Eobard Thawne, as introduced by name in The Flash #153, is the first and most well-known character to assume the Reverse-Flash mantle, and is additionally a descendant of Malcolm Thawne and ancestor of Bart Allen, Thaddeus Thawne and Owen Mercer.

In his post-Crisis on Infinite Earths comic book appearances, Professor Eobard Thawne is depicted as a scientist from the 25th century who originally idolized the Flash. He replicated the accident that gave the Flash his powers, but was driven insane and became obsessed with ruining the Flash's life upon learning that he was destined to become his greatest enemy–the Reverse-Flash. Fueled by jealousy and hatred, Thawne travels throughout time to torment and destroy the Flash's life. He has been established as one of the fastest speedsters in the DC Universe. Thawne has frequently died, but has made multiple returns through resurrections and time travel.

"Flashpoint" is a 2011 comic book crossover story arc published by DC Comics. Consisting of an eponymous core limited series and a number of tie-in titles, the storyline premiered in May 2011. The core miniseries was written by Geoff Johns and pencilled by Andy Kubert. The series radically changes the status quo for the DC Universe, leading into the publisher's 2011 relaunch, The New 52.

Flashpoint details an altered DC Universe in which only Barry Allen seems to be aware of significant differences between the regular timeline and the altered one, including Cyborg's place as the world's quintessential hero, much like Superman is in the main timeline, with Superman himself being held captive as a lab-rat by the United States government within an underground facility in Metropolis. In addition, Thomas Wayne is Batman, and a war between Wonder Woman and Aquaman has decimated western Europe.

"The Button" is a 2017 comic book crossover created and published by the comic book publishing company DC Comics. The story arc consists of four issues from DC's Batman and Flash publications, functioning in part as a larger buildup towards the "Doomsday Clock" event. The plot was written by Joshua Williamson and Tom King, with art by Jason Fabok and Howard Porter.

In the story, Batman and Flash work together to uncover the truth behind the mysterious button found in the Batcave. As the investigation unfolds, the secrets of the Button bring about the wrath of Professor Zoom as well as the unknown orchestrator of DC Rebirth.

Carmine Infantino (/ɪnfənˈtiːnoʊ/; May 24, 1925 – April 4, 2013) was an American comics artist and editor, primarily for DC Comics, during the late 1950s and early 1960s period known as the Silver Age of Comic Books. Among his character creations are the Black Canary and the Silver Age version of the Flash with writer Robert Kanigher, Elongated Man with John Broome, the Barbara Gordon incarnation of Batgirl with writer Gardner Fox, Deadman with writer Arnold Drake, and Christopher Chance, the second iteration of the Human Target, with Len Wein.

He was inducted into comics' Will Eisner Award Hall of Fame in 2000.