While it is said to be just a cameo, The Flash director Andy Muscietti describes it as a “substantial” part. Affleck reportedly got the script for The Flash last week and agreed to jump on board the project. Muschietti said in a statement:
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“He’s a very substantial part of the emotional impact of the movie. The interaction and relationship between Barry and Affleck’s Wayne will bring an emotional level that we haven’t seen before. It’s Barry’s movie, it’s Barry’s story, but their characters are more related than we think. They both lost their mothers to murder, and that’s one of the emotional vessels of the movie. That’s where the Affleck Batman kicks in.”
The Flash is scheduled for release on June 3, 2022.