<P> In the third season, Dooku is forced to eliminate Ventress to prove his loyalty to Sidious . Ventress survives, however, and works with Mother Talzin to kill Dooku by giving him Savage Opress as a replacement apprentice . During a confrontation between Dooku and Ventress, Savage turns on both . In the fourth season, after defeating Anakin in three separate lightsaber duels, Dooku gets his revenge on Ventress by having Grievous order the systematic genocide of the Nightsisters . Believing both Ventress and Talzin have been killed, Dooku knows the only threat left to him is Savage while sensing his eventual meeting with Darth Maul . In the fifth season, Dooku plays minor roles via hologram in guiding King Rash of Onderon and Grievous taking over Florrum . </P> <P> In the sixth season, Dooku finds out the clone trooper Tup executed Order 66 prematurely and works behind the scenes to stop the Republic's investigation . He then manipulates the Banking Clan and its representative Rush Clovis into putting all their resources in the hands of the Sith, bringing war to the planet Scipio . The Jedi find a lightsaber belonging to deceased Jedi Master Sifo - Dyas--whom Dooku murdered years earlier--and start an investigation . Sidious forces Dooku to clean up their trail . Dooku confronts Anakin and Obi - Wan on Oba Diah, revealing his alter - ego Darth Tyranus to the Jedi, and they realize that it was he who created the clone army . Some further investigation by Yoda prompts Dooku and his master to perform a Sith ritual in an unsuccessful attempt to break the Jedi Master; Dooku appears to fight Anakin in the illusion, but is executed in a manner very similar to his eventual demise . </P> <P> Dooku appears extensively in the Star Wars series' "Expanded Universe" of novels, comic books and the 2003 micro-series Star Wars: Clone Wars . In 2015, Lucasfilm labeled such material non-canon, and rebranded them "Star Wars Legends". </P> <P> In the Star Wars: Republic series, set during the Clone Wars, Dooku trains multiple Dark Jedi apprentices, most of whom he uses as minions . His apprentices include Ventress, Tol Skorr and renegade Jedi Quinlan Vos . Vos initially intended to infiltrate the Separatists as a spy for the Jedi Council but instead nearly falls to the dark side . </P>

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