172. Count Dooku

Count Dooku is a fictional character from the Star Wars universe. Dooku is the main antagonist of Star Wars Episode II: Attack of the Clones and throughout the fictional events of the Clone Wars and is a supporting villain in Star Wars Episode III: Revenge of the Sith. Count Dooku plays a substantial role in the "Expanded Universe" of novels, comic books, and video games. In his television and video game appearances, Count Dooku is portrayed by voice actor Corey Burton. In all of his film appearances, which consists of the prequel films and Star Wars: The Clone Wars, he is played by Christopher Lee.
Although he was a respected Jedi Master, Dooku became disillusioned with the Jedi Council and became one of the "Lost Twenty" Jedi to leave the Order. In between Episodes I and II, Dooku falls to the dark side of the Force, at which time he is initiated into the ways of the Sith by Darth Sidious, who bestows upon his new pupil the title of Darth Tyranus.
Tyranus leads the Separatists in the Clone Wars, which in turn lead to the destruction of many worlds throughout the galaxy. During the Clone Wars he trains General Grievous, leader of the Droid Armies, and Asajj Ventress, his personal assassin. In Episode III: Revenge of the Sith, Darth Tyranus is betrayed by Sidious, who replaces him with his third apprentice, Darth Vader.