***1/2  (139m | PG-13) This may well be the best of all six "Star Wars" movies -- with the caveat that you need to have seen the other five films to truly grasp its significance.

Thirty-five years after Pink Floyd released "The Dark Side of the Moon," Roger Waters finally has come to grips with his own dark side. "Things do change," says Waters, 64. "We all have to own up to the fact that we carry a dark side.

After landing the role of Anakin Skywalker as a lovesick, discontented teen in episode two, "Attack of the Clones," Christensen finally got to the moment he - and every other "Star Wars" fan - has been waiting for with "Revenge of the Sith."

All six chapters of George Lucas' science-fiction saga - including the final one, "Star Wars: Episode III - Revenge of the Sith" - will screen in a daylong marathon May 16 at London's Leicester Square.

Two decades ago, George Lucas pulled off the mask to reveal the face of one of cinema's greatest bad guys. Now, he's about to slip the mask back on. Lucas offered a preview Thursday of his final "Star Wars" chapter, which spells out the last dark steps the once goodhearted young Anakin Skywalker takes to become the villain Darth Vader.