The long-standing belief that Batman v Superman: Dawn of Justice's title contains a mistake is actually false — the "v" is a subtle reference to the film's story and deeper theme, and actually reframes its ending. The second entry into the DCEU saw the introduction of Ben Affleck's Batman, and pit him against the world's most powerful hero, Superman. The conflict between the two heroes was central to Batman v Superman's story, and it ended with the two putting their differences aside to face a far greater threat.
Though there are a number of things that made Batman v Superman controversial, there is a commonly held belief that its title contains an inaccuracy. That is, that the "v" in Batman v Superman should actually read "vs", because it seemingly refers to the physical confrontation between the two, and the «v» is primarily used for legal battles between two parties. When taken at face value, the wording of Batman v Superman's title is clearly a mistake, because though the film does see Superman briefly appear before congress, the two heroes don't engage in any discernible legal proceedings against one another.
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However, the film's subtitle, Dawn of Justice, as well as the subtext of its story, subtly lend credence to the notion that the title isn't a mistake after all. In BvS, Ben Affleck's Batman and Henry Cavill's Superman find themselves at odds with one another over their respective definitions of justice, and though this does lead to the two fighting, it still represents a legal battle of sorts. Though it's not being done through proper legal channels, the idea that the central conflict is one of morals and legality makes Batman v Superman's title accurate on
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