J. Michael Straczynski's original script was jettisoned in
favor of an unfinished one
by political thriller specialist Matthew Michael Carnahan (State of Play, Lions for Lambs), with «LOST» - alum script doctors Drew Goddard (The Cabin in the Woods, Cloverfield) and Damon Lindelof (Star Trek Into
Darkness, Prometheus) brought in later to write a host of reshoots, including a new climax and ending to the film (the repeated use and imbibing of Pepsi products during these scenes would indicate the source for much of the additional reshoot budget), that pushed the release date from a winter of 2012 release to the summer of 2013.