Obi-Wan "Ben" Kenobi (/ˈoʊbiːˌwɑːn kəˈnoʊbiː/) is a fictional character in the Star Wars franchise. Within the original trilogy, Obi-Wan is a Jedi Master as a supporting character and is portrayed by English actor Alec Guinness. In the later-released prequel trilogy, a younger version of the character serves as one of the two main protagonists, alongside Anakin Skywalker, and is portrayed by Scottish actor Ewan McGregor. In the original trilogy, he is a mentor to Luke Skywalker, to whom he introduces the ways of the Jedi. After sacrificing himself in a duel against Darth Vader, Obi-Wan guides Luke through the Force in his fight against the Galactic Empire. In the prequel trilogy, set decades earlier, he is initially a Padawan (apprentice) to Jedi Master Qui-Gon Jinn and later the mentor and friend to Luke's father Anakin, who falls to the dark side of the Force and becomes Vader.