Yahoo Movies are launching a series of posters for ‘The Secret Life of Walter Mitty’. Ben Stiller stars in and directs this modern day update of the classic James Thurber story, with the film hotly anticipated since the stunning first trailer was released back in July. So far the eye-catching one-sheets has seen Walter scale a skyscraper, on top of a mountain, perched on a shark and walk the surface of the moon. But is he really there? ‘The Secret Life of Walter Mitty’ is released in the UK on 26 December.