Though not a Sith himself, the Inquisitor was tasked with hunting down and eliminating any Jedi who had survived Order 66, the order given to the Grand Army of the Republic by Darth Sidious to destroy the Jedi Order. After Darth Sidious, publicly known as Supreme Chancellor Palpatine, transformed the Galactic Republic into the Galactic Empire and declared himself Emperor, the Grand Inquisitor came into the service of the Empire and the Sith. The Pau'an male known as the Grand Inquisitor hailed from the planet Utapau, where he born over fifteen years prior to the Invasion of Naboo. During the series, he became bent on killing Kanan Janus (a Jedi Padawan) and his turning his apprentice Ezra Bridger (the protagonist of the series) to the dark side. The Grand Inquisitor is also tasked on finding younglings around the galaxy who are strong with the Force so that they will not become Jedi. He was tasked by Vader to execute any surviving Jedi he discovered with an endless army of Stormtroopers under his command on the orders of Vader's master Emperor Palpatine. Despite not being a Sith in general, the Grand Inquisitor knows a lot about the Force and has practiced on the dark side. The nameless Grand Inquisitor, as aforementioned, serves for the Galactic Empire, specifically its second most powerful entity, Darth Vader. He is voiced by Jason Isaacs, who also portrayed Lucius Malfoy and Captain Hook. The one who gave him such a task is none other than the Supreme Imperial Commander Darth Vader, who takes his role of the primary antagonist after he died in battle. Five years before the first Star Wars movie, A New Hope, The Inquisitor was tasked with the job to seek out and assassinate any remaining Jedi in the galaxy. The Grand Inquisitor is the main antagonist of the first season of the television series Star Wars: Rebels.

There are some things far more frightening than death! You have no idea what you have unleashed here today.

The grand inquisitor quotes