Lucas retreated to his 4, 700-acre Skywalker Ranch, north of San Francisco, and cloistered himself.

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Before the event, every feature-film director is invited to George Lucas's Skywalker Ranch in Marin County, north of San Francisco, for a two-day networking retreat.

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That's probably because "Clone Wars" supervising director Dave Filoni made sure Mayhew came to the Skywalker Ranch so the show's artists could learn how the original Chewbacca walked, moved his head and made facial expressions.

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Clayton worked with all of them but most notably Lucas and his Skywalker Ranch studios inMarin County, California, where he engineered sound recordings, which included the first recordings at Skywalker Sound with the San Francisco Ballet Orchestra.

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Extensive art work including character designs, costume designs, and set designs were all developed by a top team of concept artists and designers who worked for more than a year on the third floor design studio at George Lucas's Skywalker Ranch's main house on the project.

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