With the recent release of "Batman v. Superman: The Dawn of Justice," many are going to watch the movie for the battles with and between two superheroes — with Wonder Woman also joining the fray.
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For brief moments during the film you see some friction between their true identities, Bruce Wayne, Diana Prince, and Clark Kent. The fact that superheroes have a "true" alternative identity adds much drama to their stories. It also allows for a separate storyline, a more personal side, to each super character.