A behind-the-scenes featurette for World War Z sheds new light on the story, which is adapted from Max Brooks' celebrated novel. Director Marc Forster explains that Brad Pitt's Gerry Lane, a U.N. worker, is torn between trying to save his family and helping to stop the spread of this worldwide zombie epidemic. Mireille Enos, who plays Gerry's wife, also discusses the unique world these characters inhabit, where there is just 87 days left before humanity is wiped out completely. Check out the latest footage from this summer action thriller, in theaters June 21.