The Batman (DCEU)

In 2013, it was announced that Ben Affleck would replace Christian Bale as Batman and that he will appear in many upcoming DCEU projects and one of them was a solo Batman film.

Plot
The film would've taken place in Arkham Asylum and Batman would face Deathstroke.

Cast

 * Ben Affleck as Bruce Wayne/Batman
 * Joe Manganiello as Slade Wilson/Deathstroke
 * Jeremy Irons as Alfred Pennyworth
 * J.K. Simmons as James Gordon
 * N/A as Barbara Gordon/Batgirl
 * Jason Segel as The Riddler

Why It Was Cancelled

 * 1) Both Batman v Superman: Dawn of Justice and Justice League were panned by critics and audiences.
 * 2) Justice League flopped at box office.
 * 3) Ben Affleck decided to not play Batman after Justice League. He also stepped down from acting and directing the film due to personal issues and that he was unhappy that the Snyder Cut wasn't released yet.

Results

 * The Ben Affleck version of The Batman film was permanently cancelled.
 * Ben Affleck is set to reprise his role for the final time in 2022's The Flash.
 * In 2022, the film was retooled as a non-DCEU film starring Robert Pattinson and directed by Matt Reeves will hit theaters, 10 years after the last live-action solo Batman film The Dark Knight Rises was theatrically released.
 * Ben Affleck and Joe Mangianello returned as Batman and Deathstroke to do reshoots for Zack Snyder's Justice League.
 * Joe Manganiello revealed the film would have introduced Batgirl.