Darth Vader is a character in the Star Wars franchise. He is the primary antagonist of the original film trilogy and, as Anakin Skywalker, is the protagonist of the prequel trilogy. Born a slave, he later becomes a powerful Jedi. He is lured to the dark side of the Force by Chancellor Palpatine, and becomes the Sith Lord Darth Vader. After being severely wounded in a lightsaber battle, he is transformed into a cyborg. He is the husband of Padmé Amidala and the biological father of Luke Skywalker and Leia Organa Solo.

Sheev Palpatine is a fictional character in the Star Wars franchise created by George Lucas. He first appears on screen in The Empire Strikes Back (1980), in which he is credited as The Emperor, and is the overarching antagonist of the three film trilogies in the Skywalker Saga, in which he is portrayed by Ian McDiarmid. The character is also known by his Sith name, Darth Sidious, which was first used in the novelization of The Phantom Menace (1999). In creating Palpatine, Lucas was inspired by real-world examples of democratic backsliding during the rise and rule of dictators such as Julius Caesar, Napoleon Bonaparte, and Adolf Hitler.