Many thought this would never happen due to veto red tape Warner Bros. used to put around the idea of crossover with TV properties, but in January 2020, the DCEU eventually crossed path with the Arrowverse, with Ezra Miller's Barry Allen/Flash meeting Grant Gustin's Barry Allen/Flash in the multiverseCrisis Crossover event Crisis on Infinite Earths, via being trapped in the Speed Force.
This ended up being a precursor to Barry's own film, in which not one but two Batmen are slated to appear: Michael Keaton and Ben Affleck. Cue the fandom going wild as nobody would have guessed these two would return to the role of the Caped Crusader, much less in the same movie. And this was not a throwaway rumour like so many that have plagued the franchise for years, it was officially confirmed at the 2020 DC FanDome virtual event, with some nice concept art◊ to boot.
◊ to boot.
