The Flash

Warner Bros. hired comic book writer Jeph Loeb to write a screenplay in the late-1980s, but the outing never materialized. Development for a film adaptation was revived after the studio was impressed with David S. Goyer's script for Batman Begins, and he was offered the choice of a Flash or Green Lantern film adaptation. In December 2004, it was announced that Goyer would be writing, producing and directing The Flash. He approached his Blade: Trinity co-star Ryan Reynolds for the Barry Allen role, with the intention of also using Wally West as a supporting character. Goyer's script, which he tonally compared to Sam Raimi's work on the first two movies of the Spider-Man trilogy, was influenced by seminal comic book runs by Mike Baron, Mark Waid, and Geoff Johns. By 2007, however, Goyer dropped out of the project, citing creative differences with the studio.

The same month Goyer revealed he was off The Flash, Warner Bros. hired husband and wife screenwriting duo Michelle and Kieran Mulroney to script a Justice League film featuring Barry Allen, and Shawn Levy to direct a spin-off featuring Wally West. Justice League attached George Miller as director. He cast Adam Brody as Barry Allen. Levy departed from The Flash due to his commitment to Night at the Museum: Battle of the Smithsonian and was replaced by David Dobkin. Filming was nearly set to begin for Justice League, but Brody's contract lapsed when the Australian Film Commission denied Warner Bros. a 45 percent tax credit. Warner Bros. hired Craig Wright to script The Flash and announced a 2008 release date following the collapse of Justice League. The project became delayed by the 2007–08 Writers Guild of America strike. Warner Bros. brought Batman producer Charles Roven aboard, with comic book writer Geoff Johns serving as a consult and co-writer. Johns created a new film treatment. Dan Mazeau was the screenwriter.

In September 2009, Warner Bros. Entertainment Inc. had launched a new division, DC Entertainment Inc., in order to better expand the DC Brand. In October 2009, Charles Roven was asked about the future of the Flash. 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. The day after Dan Mazeau responded to the article by saying, "Just to chime in on your latest article: The Flash has not been hobbled. Everything is moving forward as planned… I’m still writing the script. Geoff Johns is still consulting. Flash fans have no cause for concern, and — IMO — lots to be excited about." In February 2010, it was reported that Warners was expected to announce its DC slate in the coming months populated by characters like The Flash and Wonder Woman."

Why It Was Cancelled

 * 1) Due to Creative differences.
 * 2) The 2007–08 Writers Guild of America strike.

Result

 * The film was permanently cancelled
 * Another contributing factor to the cancellation was the writers Guild of 2007 to 2008.