the others rendezvous with the Rebel Alliance, Luke returns to Dagobah, where he finds that Yoda is on his deathbed. Before he dies, Yoda confirms that Darth Vader, once known as Anakin Skywalker, is Luke's father, and that "there is another". The ghost of Obi-Wan Kenobi confirms that this "other" is Luke's twin sister: Leia. Obi-Wan tells Luke that he must fight Vader again to defeat the Empire. Obi-Wan also warns Luke to keep his emotions in check, as his anger could lead him to the Dark Side.