As fans will know, Keaton is on board to return as Batman in The Flash movie, reprising the role he played in Tim Burton’s classic Batman movies.
Along with Michael Keaton and Ben Affleck as different Bat-men, The Flash brings back Ezra Miller to play the titular superhero.
There have been demands from fans for Keaton to come back to the role one day, perhaps with a Batman Beyond movie, leading to this return in The Flash.
As it turns out, slipping back into the Batsuit was no problem at all for Michael Keaton.