Miller, who starred as the superhero in Justice League, Batman v Superman: Dawn of Justice, and Suicide Squad, is said to be working with Morrison (known for his off-kilter narratives) to take the character in a darker direction. The move is apparently Miller's bid to continue on as Barry Allen, but any change of tone is risky for the franchise.
If the new Flash script takes on a darker approach, Miller would potentially be contradicting the project's directors, John Francis Daley and Jonathan Goldstein, who are believed to be coming at The Flash from a more lighthearted perspective. A fun vibe is also apparently favored by studio Warner Bros., especially following the success of Aquaman and the buzz surrounding Shazam!.
According to The Hollywood Reporter, should Miller's take on the superhero not be used by Warner Bros., it could potentially see the actor part ways with the project, with his original Flash deal reportedly ending in May this year.
This news is the latest in a number of plot twists in The Flash's journey to the big screen, which so far has seen the project go through a number of directors and writers.