On February 22, 2007, Warner Bros. hired Kieran Mulroney and Michelle Mulroney to write a treatment for a potential Justice League movie. No announcement was made on the characters, actors, or crew involved. They handed in their script by June that year. In September, word broke that Warner Brothers, happy with Mulroney's script, is moving ahead on the project and George Miller was announced as the director.[7] The film features Batman, Superman, Wonder Woman, Flash, Green Lantern, Aquaman and the Martian Manhunter. Warner Bros. has put their Justice League plans at a higher priority than a proposed sequel to Superman Returns.
In October, 2007, Miller announced auditions for the leading roles in the film, indicating that he had no interest in established actors for the parts, as he was "looking for actors who can grow into their super-roles".The film is currently slated for a 2009 release date.
In November, 2007, Australian supermodel Megan Gale has won the role to play Wonder Woman. In December, 2007 it was reported that Adam Brody had signed to play The Flash and relatively unknown actor Armie Hammer is to play Batman.