General Grievous

General Grievous commands the droid armies of the Separatists during the Clone Wars. Once a Kaleesh warrior with a flesh-and-blood body, he became envious of the powers of the Jedi and chose to become a cyborg in order to enhance his fighting strength and speed. His ability to wield four lightsabers at once makes him a fearsome adversary to even the most well-trained Jedi Knights.