Stop reading if you're spoiler paranoid. ChazeFroy writes "The actor who played Chewbacca in the original Star Wars trilogy, Peter Mayhew, will be in Episode III. Of course, this has been previously reported and comes as no surprise. However, TheForce is reporting that Mayhew's contract contains a stipulation that he must also appear in Episodes 7, 8, and 9. This was first reported in the British movie magazine Hot Dog, whose December issue with this news just hit US newstands."