U.S. actor Brad Pitt (centre, L) walks on the film set of World War Z in Marsa in Valletta's Grand Harbour June 29, 2011. The Paramount Pictures film, directed by Swiss director Marc Forster, is based on the Max Brooks novel "World War Z: An Oral History of the Zombie War" and is set to be released in 2012. Filming continues in Malta until July 9 before the production moves to Scotland, according to local media.[Photo/Agencies]