Although he hopes to eventually overthrow Sidious, Dooku is ultimately betrayed by his master, who arranges his death at the hands of Anakin Skywalker.

Dooku recruits the bounty hunter Jango Fett to assassinate Senator Padmé Amidala on Coruscant, but the attempt is foiled by her Jedi protectors.

[4] Dooku captures the Jedi Knight Obi-Wan Kenobi on Geonosis, and tells him that thousands of senators are under the influence of a Sith Lord named Darth Sidious.

Unable to match Yoda's prowess, Dooku distracts him by using the Force to dislodge a large pillar and send it falling toward Anakin and Obi-Wan.

He brings the designs for the Death Star to his master Darth Sidious, informing him that the war has begun and that their plan is working.

[5] Dooku and the Separatist commander General Grievous have kidnapped Supreme Chancellor Palpatine—Sidious's alter ego—as part of a plan orchestrated by Palpatine to lure Anakin to the dark side of the Force.

In a deleted scene, Dooku claims that he arranged for Tusken Raiders to kidnap and kill Anakin's mother, as seen in Attack of the Clones.

In the fourth season, Dooku defeats Anakin in three separate lightsaber duels, and gets his revenge on Ventress by having General Grievous order the systematic genocide of the Nightsisters.

In the fifth season, Dooku plays minor roles via hologram in guiding King Rash of Onderon and Grievous taking over Florrum.

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.

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.

However, as the events of Revenge of the Sith are concurrent with the season's final arc, Ahsoka Tano is informed of his demise at Anakin's hands by Obi-Wan, who tells her that it is important to capture Maul, being the only way the Jedi can discover the true identity of Darth Sidious after Dooku's death.

The miniseries also focuses on Dooku's friendship with his padawan Qui-Gon Jinn, with original actor Liam Neeson returning to voice the character in the episode set concurrently to The Phantom Menace.

An unfinished sixth season arc of The Clone Wars was adapted into the 2015 novel Dark Disciple by Christie Golden.

However, upon deducing that he has turned to the dark side, the Council sends him to face Dooku again as a test of loyalty, with Obi-Wan Kenobi and Anakin Skywalker tailing him.

Solha establishes that the Count had dispatched him and his siblings to Mokivj to produce cortosis B2 super battle droids for the Clone Wars.

In Part 1, he is first tempted by the dark side of the Force as a child when his best friend and fellow Padawan Lorian Nod steals an ancient Sith Holocron from the Jedi Archives.

Finally in Part 4, set in the midst of the Clone Wars, Dooku, now a Sith, kills Nod after his former friend refuses to join the Separatists.

Matthew Stover's novelization of Revenge of the Sith expands upon Dooku's character; it portrays him as an evil man who sees others as mere objects to be used and discarded, and who despises the galaxy's non-human species and plans to exterminate and enslave them once in power.

It also explains that Dooku believes that Palpatine's staged kidnapping is part of a plan to kill Obi-Wan and turn Anakin to the dark side.

In this scenario, once the Republic becomes the Galactic Empire, Dooku and Palpatine will rule the galaxy together, while Anakin will command a "Sith Army" formed from the remains of the Jedi.

In the final episode, he plays a part in Grievous's attack on Coruscant and kidnapping Palpatine, setting the stage for Revenge of the Sith.