Peter Berg said he did this movie for his young son. While editing The Kingdom (2007), his son's frequent visits to the editing room prompted him to make a comic-book style movie. When this script emerged in 2006, with no director attached, he jumped at the chance. In the DVDs extras Michael Mann was actually going to direct the movie. He felt he wasn't the right person, due to all of the CGI sets, and suggested Peter Berg.

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