In 1940, the U.S. had yet to enter WW II when controversial comic artists Joe Simon and Jack Kirby created a new Marvel hero to take on Hitler. On his first cover, Captain America punches Hitler, making a patriotic statement and enraging the Nazis.

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In a time when the DC-Marvel rivalry made crossovers all but impossible, three friends go rogue. Inspired by a Halloween parade, Marvel and DC artists intertwine heroes and story lines for the first real crossover, and execs are none the wiser.

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In 1970, after DC successfully poaches longtime Marvel comic artist, Jack Kirby, Stan Lee learns his old pal has been harboring resentment when Kirby’s comic villain “The Funky Flashman” looks remarkably familiar, forever altering their relationship.

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When two Marvel creators publish a Dr. Strange story with religious overtones, Stan Lee fears it'll upset readers and pushes them to write a retraction. Instead, they hatch a scheme to keep the storyline and avoid any future creative scrutiny.

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The first official Marvel-DC crossover was far from a simple collaboration for the famous rivals. Before the Man of Steel and Spidey could share that bone-crushing handshake, Stan Lee and Carmine Infantino had to battle it out behind-the-scenes.

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DC implements a bold initiative in the mid 70s to combat plummeting sales by launching the “DC Explosion” to bring more titles to newsstands. But a miserably cold winter Affects sales and DC is forced to cancel 40% of their line.

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In the late 80s Batman’s new sidekick, Jason Todd, was less than a hit with fans. DC decided to let its audience choose his fate. Comic readers could call in and vote for the life or death of young Robin -- and their choice shook the comic world.

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When frustrated comic book writers at DC are forced to shelve a storyline a year in-the-making, they do the unthinkable, and kill Superman. What started as an off-handed remark turned into a worldwide phenomenon and jump-started a lagging DC Comics.

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Trying to compete with Marvel, DC attempts to create a worldwide sensation. It should have been a blockbuster series over a few issues, but instead turned into a legendary three-year boondoggle known as "The Clone Saga" that fans lament to this day.

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Stan Lee, the pioneer of Marvel, shocks the comic book industry when he announces he’s going to work for DC. Teaming up with various DC in-house creators, Stan re-imagines some of the company's most well-known, iconic characters.

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