Naruto Shippūden: Season 20, Episode 421

20 - 421: The Sage of the Six Paths

Naruto wakes up and encounters the legendary shinobi, the Sage of Six Paths. He reveals to Naruto that he is the reincarnation of his son, Ashura, and that Sasuke is the reincarnation of Indra, Ashura's older brother.