The Jedi are first introduced in the 1977 motion picture "Star Wars" as an order of warrior monks who serve as "the guardians of peace and justice in the galaxy" and embrace the mystical Force. Obi-Wan Kenobi (Alec Guinness) explains that the Galactic Empire has all but exterminated the Jedi, and seeks to train Luke Skywalker (Mark Hamill) to be the Jedi Order's last hope. Darth Vader (David Prowse/James Earl Jones) is also established as the Jedi's main enemy. By the end of the film, which depicts the Battle of Yavin, Luke is on the path to becoming a Jedi. In the sequel, "The Empire Strikes Back", Luke receives extensive Jedi training from the elderly (and only surviving) Jedi Master Yoda (Frank Oz), even as he learns that Vader is, in fact, his father, former Jedi Knight Anakin Skywalker. The third film in the original trilogy, "Return of the Jedi", ends with Luke redeeming Vader and helping to destroy the Empire, thus fulfilling his destiny as a Jedi.