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The Sherlock Holmes director was asked to step in to give 300 helmer Zack Snyder time to work on writing another Superman film by 2013, Vulture has reported.
Xerxes, the follow-up to the warrior film, is also based on a Frank Miller graphic novel about the Zoroastrian king of the Achaemenid Empire.
Ritchie's own comic series, titled Gamekeeper, was put into development last year by Warner Brothers and Matrix producer Joel Silver.
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