Chibaku Tensei (episode)

is episode 167 of the Naruto: Shippuden anime.

Synopsis
After Hinata is taken down by Pain, Naruto becomes enraged, which causes the release of the Nine Tails' chakra. He morphs into his Four Tailed form and attacks Pain. He progresses in his transformation and bombards Pain in a flurry of enhanced attacks. Pain retreats in order to perform Chibaku Tensei. The technique rips apart the ground creating a small moon and traps Naruto inside of it. On a mission elsewhere, Yamato senses Naruto has broken the seal and aborts his mission to track Kabuto, to help Naruto in anyway he can. At this time, Naruto is within his sub-conscience reflecting on conflicting feelings of pain and anguish, he succumbs to the Nine Tails' will but as he was about to break the sealing on the Nine Tails containment, the Fourth Hokage, appears to stop him.