Warner Bros.' DC Extended Universe has already gotten off to a great start with the box office success of Batman v Superman: Dawn of Justice. The studio will release Suicide Squad this summer, with its 2017 releases Wonder Woman and Justice League Part 1 currently in production. The studio has hit a stumbling block with one of its 2018 movies, though, as writer-director Seth Grahame-Smith parts ways with The Flash, due to creative differences between the filmmaker and Warner Bros. It isn't known if this departure will immediately impact the March 16, 2018 release date that has already been set.

Seth Grahame-Smith signed on in October to write the script and direct The Flash movie for Warner Bros., which will star Ezra Miller as Barry Allen/The Flash. While no specific details were given regarding the creative differences between Seth Grahame-Smith and the studio, The Hollywood Reporter reveals that the studio will retain the script he wrote, based off a treatment written by Phil Lord and Chris Miller. Phil Lord and Chris Miller were once eyeing the project as a directorial vehicle, before they signed on to direct the Star Wars Han Solo} spinoff, which is set to hit theaters on May 25, 2018.

There is still plenty of time to find the right director to replace Seth Grahame-Smith, since filming likely won't begin until some time next year, although an official production start date has yet to be announced. It isn't known if the studio is already actively searching for the filmmaker's replacement, or if there are any front runners for the gig quite yet. No details were released about the story written by Seth Grahame-Smith, but we've already gotten a glimpse of the Scarlet Speedster in action.

Related: The Flash Movie Is Less Flashpoint and More Back to the Future

Batman v Superman: Dawn of Justice featured cameos from Justice League members The Flash, Aquaman (Jason Momoa), and Cyborg (Ray Fisher). The Flash actually had two brief cameos. Barry Allen was first seen during one of Bruce Wayne's (Ben Affleck) "Knightmare" sequences, where he came through the speed force to issue a warning to Bruce. We also saw Barry when Bruce Wayne hacked into Lex Luthor's files, and uncovered security camera footage of the speedy superhero stopping a convenience store robbery.

The Flash would have marked Seth Grahame-Smith's feature directing debut, but he previously directed episodes of The Hard Times of RJ Berger, the MTV series he co-created with David Katzenberg. Seth Grahame-Smith is also writing The Lego Batman Movie for Warner Bros., along with the highly-anticipated sequel Beetlejuice 2, which he co-wrote with his writing partner David Katzenberg. The LEGO Batman Movie is set for release on February 10, 2017, but it isn't known when production will begin on Beetlejuice 2, or when that long-awaited follow-up will hit theaters. We'll keep you posted with more updates on The Flash movie as soon as they become available.