TheForce.net points to an article in The Salt Lake Tribune concerning the growing use of celebrity voices in video games. The article mentions many titles, including LucasArts' Star Wars: Bounty Hunter. Here's a quote:
[John Knoles' Bounty Hunter] was a chance for actor Temuera Morrison to expand on his character, a favorite among "Star Wars" fans.Fascinating, eh? Read the article for more examples.
"In the movie, he had four lines," Knoles said. "In the game, he's the star."
Source: TheForce.net