Count Dooku is a major antagonist in the Star Wars franchise. Once the Jedi Knight and former apprentice of Jedi Master Yoda and Master of Qui-Gon Jinn, Dooku fell to the Dark Side, becoming the second apprentice of Darth Sidious and head of State of the Convederacy of Independant Systems after Qui-Gon's death at the hands of Maul.
He is the main antagonist of Attack of the Clones, a minor antagonist in Revenge of the Sith, and the main antaognist of the Star Wars: The Clone Wars film and television series.
In the films, he was portrayed by Christopher Lee and voiced by Corey Burton in The Clone Wars series.