In the 2023 film The Flash, Michael Keaton reprises the role from the films Batman (1989) and Batman Returns (1992), but (according to Wikipedia) "this time as an alternate version of the character from 2013–Barry's timeline".
Wikipedia also explains that "Ben Affleck reprises his DCEU role as the original Bruce Wayne / Batman, the leader of the Justice League from Barry's timeline ... Affleck appears, uncredited, for five minutes in the film ... George Clooney also makes an uncredited cameo appearance as an alternate version of Wayne who replaces the DCEU iteration in Barry's timeline in the film's ending. Clooney reprises the role from Batman & Robin (1997).
I have literally no idea what most of this means, except that "Barry" is presumably a reference to Barry Allen, whose alter–ego is one of many incarnations of The Flash.
© Haydn Thompson 2025