Yoda makes a brief appearance in "Return of the Jedi", set a year after "The Empire Strikes Back". Now sick and frail, Yoda informs Luke that he has completed his training but will not be a Jedi until he confronts Darth Vader; he also confirms that Vader is Luke's father, something Vader had told Luke in the previous film. Yoda then peacefully dies at the age of 900, his body disappearing as he becomes "one with the Force". He leaves Luke with the knowledge that "there is another Skywalker." Moments later, Obi-Wan's ghost helps Luke come to the realization that the "other" of whom Yoda spoke is his twin sister, Princess Leia.