DC Comics in 1938, with Action Comics #1, launched the original comic book super hero universe. They introduced Superman, the Man of Steel, the Last Son of Krypton, the Man of Tomorrow. Very soon afterwards they introduced Batman, Wonder Woman, Green Lantern, Hawkman, the Flash and more. Then, in All Star Comics #3, they took the boldest step yet and introduced the Justice Society of America and with that created a shared universe. Over the course of the next fifty years, the DCU expanded exponentially and one world was no…
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