With $533 million in worldwide box office receipts, it's no surprise that Brad Pitt thinks a sequel to "World War Z" could become a reality. Bing: More on 'World War Z' | More on Brad Pitt Based on the novel by Max Brooks about a worldwide plague of zombies and its impact, "World War Z" became one of this summer's biggest success stories. With bad buzz surrounding the film following extensive rewrites and reshoots of its third act and an exploding budget that hovered near $200 million, industry observers were predicting a disaster. But thanks in part to tireless campaigning by Pitt, who produced and starred in it, "World War Z" opened with $66 million in its first weekend in U.S. theaters on its way to over half a billion dollars worldwide. Audiences embraced the movie and even many critics gave it decent marks. So when asked by Variety about the possibility of a follow-up, Pitt said, "We're certainly talking about it, yes...We have so many ideas on the table from the time we spent developing this thing and figuring out how the zombie worlds work." But, he added, "We gotta get the script right first to determine if we go further." "World War Z" was initially proposed as the first of a trilogy, and there is plenty of material from Brooks' novel, which is told as an oral history, that was left out of the first film but could be used in follow-ups (The Battle of Yonkers, anyone?). Pitt seemed to feel the same, saying, "We have so many ideas and so much information -- we think we have a lot of stuff to mine from." One thing that is not clear is whether director Marc Forster would return, as he and Pitt reportedly clashed during the movie's production. Watch the actor's comments in Variety's video interview. .