The Reverse-Flash would have been the major antagonist in the SnyderVerse Flash trilogy, rather than the Dark Flash in Andy Muschietti's film.
The Flash film, directed by Rick Famuyiwa, would have established Zoom as the main villain of the DC Universe, with ramifications for the rest of the Justice League.
Originally meant to be a solo film, Famuyiwa's Flash was eventually expanded into a trilogy of trilogies under the SnyderVerse by Warner Bros.
The Flash versus the Reverse-Flash was almost a reality! The SnyderVerse's ambitions for an abandoned Flash trilogy were similarly far loftier.
Most crucially, if Zack Snyder's interpretation of the DC Comics films had remained intact, the Dark Flash would not have been the principal antagonist, as he was in director Andy Muschietti's The Flash.
Grimes sings. In December 2022, Mercury Nashville/Range Music signed him and released "No Horse to Ride," his first song. He's making his first album.
For better or worse, most of the SnyderVerse version of the DC Extended Universe (DCEU) has been abandoned.
According to storyboard designer Jay Oliva, Professor Zoom, alias the Reverse-Flash, would have been Barry Allen's (Ezra Miller) on-screen enemy rather than the Dark Flash – in a different reality, of course.