Sasha Calle as Kara Zor-El / Supergirl: A powerful Kryptonian with powers, abilities, and a costume similar to Superman. Calle is the first Latina actress to portray Supergirl. Michael Shannon as General Zod: A Kryptonian general who possesses the same powers as Superman and was killed by him in Man of Steel (2013). Ron Livingston as Henry Allen: Barry's father who was wrongfully convicted of his wife's murder. Billy Crudup previously played the character in Justice League (2017) and its director's cut Zack Snyder's Justice League (2021). Maribel Verdú as Nora Allen: Barry's mother who was murdered in his youth. Kiersey Clemons as Iris West: A journalist for the Picture News and love interest for Barry. Antje Traue as Faora-Ul: General Zod's second-in-command, who was sent to the Phantom Zone at the end of Man of Steel. Michael Keaton as Bruce Wayne / Batman:A wealthy socialite from Gotham City who moonlights as a crimefighting vigilante. This version of Wayne hails from an alternate universe. Keaton reprises his role from Batman (1989) and Batman Returns (1992), with this film ignoring the events of the subsequent films Batman Forever (1995) and Batman & Robin (1997), in which Keaton did not appear. Ben Affleck reprises his DCEU role as Bruce Wayne / Batman, the original version of Wayne from Barry's timeline and the leader of the Justice League. Director Andy Muschietti said the character has a substantial emotional impact on the film through his relationship with Barry, in part because their mothers were both murdered. Affleck said his scenes in the film were his favorite as the character and a "nice finish" for his time as Batman up to that point. Temuera Morrison, who portrays Aquaman's father Thomas Curry in Aquaman (2018) and Aquaman and the Lost Kingdom (2023), is also expected to be in the film. Additionally, Saoirse-Monica Jackson, Rudy Mancuso, and Luke Brandon Field have been cast in undisclosed roles. Production Development Early attempts Development of a film based on the DC Comics character the Flash began in the late 1980s when Warner Bros. hired comic book writer Jeph Loeb to write a screenplay. Warner Bros. hired David S. Goyer to write, direct, and produce a new version of The Flash in December 2004 after he impressed them with his script for Batman Begins (2005). Goyer approached Ryan Reynolds to portray Wally West / The Flash after working with him on