According to Deadline, Sean Penn is in talks to star in the remake The Secret Life of Walter Mitty, which Ben Stiller will direct and star in as the title character. The story centers on Walter Mitty, a timid magazine photo manager who goes off on an escapade to find a missing negative. Sean Penn will play a photographer, in what has been described as a small but crucial role. Kristen Wiig, Patton Oswalt, Adam Scott, and Shirley MacLaine are also attached to star. Ben Stiller will direct from a screenplay by Steve Conrad. Filming is set to start later this month, although it isn’t clear when 20th Century Fox plans to release the movie.