Darth Vader U.S. Patent and Trademark Office under Trademark #77419252 and is officially described in the documentation as ""The sound of rhythmic mechanical human breathing created by breathing through a scuba tank regulator."" Commentators have often pointed to the influence of Akira Kurosawa's films such as "The Hidden Fortress" (1958) on George Lucas, and Vader's Samurai-inspired costume design is held up as a significant example of the Japanese influences on "Star Wars". Darth Vader was portrayed by bodybuilder David Prowse in the original film trilogy, and by stunt performer Bob Anderson during the character's intense lightsaber fight scenes. Lucas originally intended for
Star Wars: Episode III – Revenge of the Sith state to fight a Sith Lord. These are a few examples of many descriptions of characters' feelings and inner narrative. There are even some humorous lines added in, including extra dialogue in the battle between Grievous and Obi Wan - Grievous says, "I was trained by Count Dooku," and Obi-Wan replies, "What a coincidence; I trained the man who killed him." An official prequel novel, "Labyrinth of Evil" () by James Luceno, was published in 2005. It is set near the end of the Clone Wars and directly before the events of "Star Wars: Episode III Revenge of the Sith".