Warning: SPOILERS for The Batman ahead.
The latest outing for The Batman introduces a selection of dangerous villains to Gotham, and might be priming one of them to become the reason Pattinson's Batman eventually kills. Bruce Wayne is notorious for his one rule, which stipulates that the hero cannot kill, no matter how far he might find himself pushed. However, the film potentially sets up the circumstance which sees the hero pushed too far, to the extreme that he snaps and breaks his core rule as Gotham's vigilante.
The Batman takes its audience into Bruce Wayne's second year as the Dark Knight, where Pattinson's iteration of the character encounters a myriad of deadly foes, from the Riddler to notorious crime lord, Carmine Falcone. Furthermore, the film introduces an important character to the hero's future narrative at the very end of the movie: The Joker, in the cell next to Riddler in Arkham Asylum. The Batman also brings fellow vigilante and love interest Selina Kyle into the fold, and sparks a relationship between the two characters that has the potential to endure into upcoming sequels.
Related: Why The Riddler Doesn't Say «Riddle Me This» (But Joker Does)
While Batman does not kill a single person in the course of the film, he comes remarkably close to murder, after one of the Riddler's operatives attempts to kill Catwoman in front of him. It sets up the potential for him to finally cross the line in one of The Batman's sequels. Batman is a character driven by vengeance, fueled by a consuming rage to unleash his trauma on the underworld of Gotham City. Currently, Joker is a minor figure in The Batman, to say the least. However, his appearance lays the groundwork for what the character's fans know will reveal
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