Julia Roberts has confirmed she's developing an adaptation of a documentary about a six-year-old Batman fan who took over San Francisco, California for a day.

Cancer survivor Miles Scott earned the name 'Batkid' in 2013 after organisers from the Make-A-Wish Foundation recruited 11,000 volunteers to turn the streets of San Francisco into the Caped Crusader's fictional Gotham City, so the child could live out his superhero fantasies.

Opening up about the project, Batkid Begins: The Wish Heard Around the World, at the Screen Actors Guild Awards on Sunday (25Jan15), Oscar winner Roberts told U.S. news show Extra, "We're just super excited, my sister and I have a production company, Red Om Productions, we were lucky enough to see this documentary and we loved it and I think it will be a really beautiful movie."

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