Adil El Arbi and Bilall Fallah told Insider they're unsure if Keaton returns first in "The Flash" or their movie, as it doesn't have a release date.
New Rockstars on MSN
The Flash trailer breakdown! Keaton Batman Easter eggs you missed!
Michael Keaton's 1989 Batman arrives in The Flash trailer that played during the Super Bowl! Erik Voss breaks it down ...
Daniel Espinosa spoke to Insider and revealed that the appearance of Keaton's Vulture was planned even before the movie was made.
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