Warning: Contains SPOILERS for The Batman.
Barry Keoghan plays The Joker in The Batman, and several details have been confirmed about his take on the character, who appears as a (somewhat) unseen Arkham prisoner in the movie. The Batman sets up multiple DC villains, with Easter eggs laying the groundwork for the likes of Hush and Two-Face, as well as potential returning foes, such as The Riddler (Paul Dano) and The Penguin (Colin Farrell). Still, any take on the Dark Knight is likely to go up against the Clown Prince of Crime if given time, and that's no different for Robert Pattinson's.
The choice to not have The Joker as the main villain in The Batman is a smart one, especially in differentiating Reeves' movie from Christopher Nolan's Dark Knight Trilogy. Heath Ledger's Joker remains a defining portrayal and, given this was another dark, grounded take on Batman, it was sensible to opt for something different. That allowed The Riddler to take center stage and The Batman to truly be a detective movie, but The Joker wasn't left out of things completely.
Related: The Batman Easter Eggs & DC References Guide
After The Riddler is captured, there's a scene between him and a mysterious prisoner. Played by Barry Keoghan, the Unseen Arkham Prisoner gives a riddle to Edward Nashton, revealing that he is someone who can be a friend to him. Though kept in darkness, mostly hidden from view and out of focus, even in those moments there are glimpses of scars, green hair, and the noise of a hyena-esque laugh that point towards The Joker, and Reeves has since confirmed some key details about him.
Perhaps most importantly, Matt Reeves has confirmed that, yes, that Arkham prisoner in The Batman is The Joker. The movie itself provides
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