Darth Plagueis was a Dark Lord of the Sith and the master of Darth Sidious. He gained considerable knowledge in the field of midi-chlorian manipulation, but was eventually betrayed and killed by his own apprentice, in accordance with the "Rule of Two". Sidious then told the story of his teacher's death to lure Anakin Skywalker to the dark side.

Darth Plagueis was a Dark Lord of the Sith who, at some point, chose Sheev Palpatine, a human from Naboo, as his apprentice. As master and disciple, Plagueis and Palpatine—who took on the Sith's nickname Darth Sidious—worked together, trying to unlock the secrets of immortality and execute their order's plan to supplant the Galactic Republic with a new Sith Empire.

According to Sidious, Plagueis was powerful enough that he could use the Force to influence midi-chlorians to create life and prevent the death of loved ones, a knowledge that earned him the epithet "The Wise". Plagueis, however, also developed a belief that the Force could "punch back" at him because of his power. In truth, he became so powerful that the only thing he still feared was losing his power. Ultimately, Plagueis' only fear would come true. At some point, Sidious had learned everything he needed from his teacher. Furthermore, he had acquired his own pupil in the son of the Nightsister Mother Talzin, Darth Maul, a young Zabrak from Dathomir whom Sidious had kidnapped from Talzin when he was just a child. As the Rule of Two mandated that only two Sith—a master and an apprentice—could exist at any given time, one of them had to die. Now that he had no more use for a teacher, Sidious disposed of Plagueis and killed him while he slept. With Plagueis's death, Sidious not only gained Master status, but also acquired 11-4D, the Sith Lord's multi-limbed assistant protocol droid. Later, after taking Darth Vader as his apprentice, he reformed the Republic into the Galactic Empire and declared himself Emperor. In the years following his rise as Emperor, Sidious came to genuinely, if posthumously, appreciate Plagueis for the planner and prophet that he had been. Sometimes he pondered how his late master would have reacted when confronted with the trivial everyday business of Imperial politics.

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