High Quality Content by WIKIPEDIA articles! General Grievous is a fictional character in the Star Wars universe, an antagonist in Star Wars Episode III: Revenge of the Sith. He was voiced by Matthew Wood. According to the Revenge of the Sith DVD, series creator George Lucas instructed his creative team to create a villain that foreshadowed Anakin Skywalker`s transformation into Darth Vader: the heavy breathing, the cyborg body, and his seduction into a malevolent faction.