The 49-year-old actor is hopeful additional versions of the apocalyptic action film, based on the novel of the same name by Max Brooks, will be made if the debut movie is a success, because there is still plenty of material to use from the book, reported Contactmusic.
"It's set up for many sequels because the book is so dense with information and historical references, and it's an international story. There are so many things we could do with this - if it works. But we need this one to work - which we think it does," Pitt said.
"I'm so fond of this film, because there are many interpretations that start arising. And I love that it starts that kind of dialogue, but more than anything, it's just the most intense thing you're going to see all summer," he added.