Prior to Routh's casting as Superman in the film "Superman Returns", Warner Bros. had spent over a decade developing a plan to relaunch the franchise, entitled Superman Flyby, with possible stars including actors such as Nicolas Cage, Josh Hartnett, Brendan Fraser, Tom Welling, Paul Walker, Henry Cavill (who eventually became Superman in "Man of Steel" (2013)), James Marsden, Ashton Kutcher, Keanu Reeves, Will Smith, and James Caviezel, and planned directors including Tim Burton, Wolfgang Petersen, McG, Brett Ratner, and Shekhar Kapur. When director Bryan Singer came aboard the project, however, he insisted an unknown actor be cast in the part, in the tradition of the casting of the best-known film Superman, Christopher Reeve.