'World War Z' Trailer: Brad Pitt Vs. Zombies (VIDEO)

Brad Pitt fights a horde of zombies in the new trailer for "World War Z," a film that had its fair share of conflict off-screen as well.

Paramout was originally set to release "World War Z," an adaptation of Max Brooks' novel about the aftermath of a zombie apocalypse on Earth, in December. The film was shifted to June of 2013 after "significant reshoots" were requested by the studio. In June, Damon Lindelof ("Lost," "Prometheus") was reportedly hired to work on the script -- with specific focus on the ending -- despite the fact that "World War Z" finished production in 2011. (In the end, it was never confirmed that Lindelof did work on the script.) Meanwhile, as Vulture reported, the messy post-production process was exacerbated further by the fact that Pitt and director Marc Forster ("Quantum of Solace") weren't on speaking terms.

Yet the first trailer looks strong, with Pitt trying to save his family from the zombie epidemic that's plaguing the world.

Watch the trailer above.

Brad Pitt & Angelina Jolie Around Town