The Flash: Rebirth (2021 film)/Development

Background
On March 10, 2018, Legendary had acquired the rights to the Flash and Superman and wanted to make their own films. At San Diego Comic-Con 2018, Legendary announced that they got the rights and were gonna make a Flash film. Legendary also confirmed that the film would not take place in the DC Extended Universe and it was not a remake of the delayed Ezra Miller Flash film set in 2022. Gareth Edwards, the director of Monsters and Legendary's own Godzilla movie in their MonsterVerse series was announced as the director.

Chris Terrio, the writer of the DCEU films, Batman vs. Superman and Justice League was announced to be the writer, along with Zack Snyder, the creator of the DCEU and its films, Man of Steel, BvS, Justice League (originally before Joss Whedon took over), Wonder Woman, Wonder Woman 1984, and his director's cut, Zack Snyder's Justice League as the co-writer. Terrio would also do the screenplay. It was confirmed that Andrew Kreisberg, the creator of the Arrowverse series would be the co-screenwriter.