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So, I recently learned that Philip Wylie, author of the classic science fiction novel Gladiator, one of the inspirations for Superman considered suing the creators and publishers of the Man of Steel for plagiarism shortly after the character's debut, but decided not to, because A: the creators were a pair of penniless kids, and B: it's not like he wasn't drawing on a thousand years of mythology anyways.
But what if he did? Would he be able to win? What would the fallout be?