The lines between real life and fantasy are blurred for the daydreaming title character in an international trailer for The Secret Life of Walter Mitty. Ben Stiller stars as Walter Mitty, a timid photo manager who often succumbs to his own delusional fantasies to escape his boring life. When an important negative goes missing, he springs into action, in hopes of winning over his co-worker (Kristen Wiig). Sean Penn, Adam Scott, Shirley MacLaine, Kathryn Hahn and Patton Oswalt co-star in this adaptation of James Thurber's novel, in theaters Christmas Day.