General Grievous

General Grievous is a Cy-Brog Cis Leader, and one of the secondary antagonists in Star Wars: The Clone Wars. He later reappears as the primary antagonist in Star Wars: Episode III - Revenge of the Sith.

Star Wars: The Clone Wars
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Star Wars: Episode III - Revenge of The Sith
He plots to overthrow Palpatine and turn the the Republic to a state controlled by the Galactic Empire's military. Alongside his partner Count Dooku, he kidnaps Palpatine and keeps him as a hostage. He then leads The Empire through a battle on Coruscant, as he gets sucked into a hole, but escapes with a pod. He then takes over the Republic, unexpectedly with his master Sidious serving as the ruler above him (ever since Palpatine was released). Under Palpatine's commands, he tries to conquer Mustafar, however, he was unwilling to loose this time. He then gets defeated and killed by Obi Wan during a battle with him.

Trivia

 * In both the popular T.V. show and the 3rd film in the Star Wars saga, General Grevious seems to have an alliance with Count Dooku.