March 17 (UPI) -- Actor Ezra Miller and comic-book scribe Grant Morrison are working together on the screenplay for a standalone movie focused on the superhero The Flash.
Miller has played Barry Allen/The Flash in the blockbusters Batman vs. Superman: Dawn of Justice and Justice League.
Warner Bros. has since taken its DC superhero franchise in a more-lighthearted direction with Aquaman and the upcoming Shazam!. The studio hired John Francis Daley and Jonathan Goldstein to direct a Flash flick with a similar tone, but Miller reportedly wants to tell a darker tale.
If Miller and Warner Bros. can't agree on the film's direction, the actor may leave the role.