Darth Vader (born Anakin Skywalker) is a central character in the Star Wars saga, appearing as the chief antagonist in the original trilogy and one of the main protagonists in the prequel films. He is first depicted as Darth Vader, a Dark Lord of the Sith in the first of the three original films. He is then revealed in Star Wars Episode V: The Empire Strikes Back and in the subsequent prequel films to be originally a Jedi Knight called Anakin Skywalker who falls to the dark side of the Force; he is also revealed to be the father of both Luke Skywalker and Princess Leia Organa, the two main protagonists of the original trilogy. Luke ultimately redeems his father in Star Wars Episode VI: Return of the Jedi, and Anakin sacrifices himself to save his son.
The character was created by George Lucas and numerous actors have portrayed him. His appearances span all six Star Wars films, and in the expanded universe of television series, video games, novels, literature and comic books. He has also had an impact on popular culture such as politics and television, being commonly regarded as a synonym of evil. Psychiatrists have even considered him as a useful example to explain borderline personality disorder to medical students.