"The Empire Strikes Back" was released on DVD in September 2004, bundled in a box set with "A New Hope", "Return of the Jedi", and a bonus disc of extra features. The films were digitally restored and remastered, with additional changes made by George Lucas. The bonus features include a commentary by George Lucas, Irvin Kershner, Ben Burtt, Dennis Muren, and Carrie Fisher, as well as an extensive documentary called "". Also included are featurettes, teasers, trailers, TV spots, still galleries, video game demos, and a preview of "Revenge of the Sith". For the DVD release, Lucas and his team made changes that they stated would ensure continuity between "The Empire Strikes Back" and the then-recently released prequel trilogy films. The most noticeable of these changes was replacing the stand-in used in the holographic image of the Emperor (with Clive Revill providing the voice) with actor Ian McDiarmid providing some slightly altered dialogue. With this release, Lucas also supervised the creation of a high-definition digital print of "The Empire Strikes Back" and the original trilogy's other films. It was reissued in December 2005 as part of a three-disc "limited edition" boxed set that did not feature the bonus disc.