Although it went on to be a worldwide hit raking in over half-a-billion dollars, World War Z saw a heavy dose of skepticism and internal creative strife during its production. While the successful box office helped pave the way for a sequel, director Marc Forster will not be involved with the film. Star Brad Pitt, who produced the film through his Plan B Entertainment company, is moving forward with production on the sequel, although it’s still in early planning stages. There was no explicit reason given for Forster’s departure, but perhaps the director did not want a repeat of the behind-the-scenes tribulations he experienced during the first film. Hit the jump for more.