Don't be surprised if Brad Pitt pops up at a movie theater near you.

Just days after the superstar surprised filmgoers in New Jersey by showing up to introduce a screening of his new action thriller World War Z, he did the same last night in London.

"This has been a long time coming, this film," he said to the crowd, which included fans and media covering tonight's WWZ premiere. "And I think we've got something original. I think we've got something genre-bending. I think we've got something terribly realistic for summer fare. I'll let you guys decide."

WATCH: Check out this scene from World War Z!

In the movie adaption of Max Brooks' novel, World War Z: An Oral History of the Zombie War, Pitt plays a former United Nations investigator who is enlisted to help save the world from zombies. He has to leave his family (The Killing's Mireille Enos plays his wife and the mother of his two daughters) as he travels to South Korea and Israel to find a cure to the zombie virus.

Pitt is reportedly hoping the movie will be the first installment of a World War Z franchise.

He and his costars will walk tonight's red carpet in London's Leicester Square.

As E! News first told you, Angelina Jolie is expected to attend, making it her first red carpet appearance since announcing she had a double-mastectomy as a preventive measure against cancer. The premiere will also include an outdoor performance by Muse.

Now we want to hear from you. Excited to see World War Z? Leave your comments below.

PHOTOS: Check out Brad Pitt on the World War Z set!

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