Watchmen showrunner Damon Lindelof says Dave Gibbons' approval was essential.
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Lindelof says Gibbons lack of approval would have "given me serious pause."
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Gibbons, however, seems fully on board with the new show, even appearing at the premiere.
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He also recently drew new character Sister Night from the series.
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Alan Moore, however, did not offer his approval, which is hardly a surprise.
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Set 30 years after the comic, HBO's Watchmen will feature some familiar faces.
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Watchmen premieres Sunday at 9 p.m. on HBO.
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