Matt Damon was originally cast in the lead role with Ben Affleck directing, however Damon dropped out due to scheduling conflicts with his movie The Odyssey (2026) and Affleck took on the lead role himself.
Ben Affleck and Ray Fisher worked together on multiple films for the DCEU franchise. Batman v. Superman: Dawn of Justice (2016), Justice League (2017), and Zack Snyder's Justice League (2021). Affleck portrayed Batman and Fisher portrayed Cyborg.