Palpatine was born on the planet Naboo and was secretly trained as a Sith Lord by Darth Plagueis before he killed him as part of the Rule of Two. After many years of training he went undercover as the senator of Naboo, and at some point took a young Dathomirian Zabrak as an apprentice, naming him Darth Maul. He eventually was elected for role of Chancellor of the Galactic Republic and the leader of the Galactic Senate. After Maul was defeated by Obi-Wan Kenobi, he took Count Dooku, a former Jedi Master, as his second apprentice. Dooku became the political leader of the Confederacy of Independent Systems in the Clone Wars against the Galactic Republic.
Still secretly a Sith Lord, Palpatine was plotting the Republic and the Jedi's downfall. He ended up turning Jedi Knight Anakin Skywalker to the Dark Side and becoming his master, giving him the title Darth Vader. Palpatine initiated Order 66 on the clone armies, ordering the clones to kill all of the Jedi, destroying the Jedi Order and forming the Galactic Empire. Palpatine then became the Emperor of the galaxy and ruler of the Empire along with his new apprentice.
During Empire Day an image of Palpatine was displayed on the HoloNet News on Lothal at Old Jho's Pit Stop presiding in the Imperial Senate on Coruscant the end of the Clone Wars and rise of the Empire with his Royal Guards. Governor Arihnda Pryce of Lothal was also invited to celebrate with Palpatine on Coruscant.
The Siege of Lothal
Palpatine contacted Vader to ask if he had taken care of rebels. Vader informed him that they had been broken and that Anakin Skywalker's former apprentice, Ahsoka Tano was with them. Seeing this as an opportunity to locate more surviving Jedi, such as Obi Wan, he ordered Vader to dispatch another Inquisitor to hunt the rebels down.
- He is voiced by Sam Witwer in "The Siege of Lothal". In Season 4, he is voiced by Ian McDiarmid, who portrayed him in the films.
- When Palpatine appears on the viewscreen in "Empire Day", the HoloNet News depicts him as young and handsome instead of his current deformed state, a practice employed by many real-life tyrants using state-run media.