Nine-Tails (episode)

is episode 327 of the Naruto: Shippūden anime.

Summary
Son Gokū tells Naruto that it won't become his ally even if he saves it, unless it can trust Naruto, who is OK with that. Kurama ponders that it knows Naruto, and that nothing he can say will reach a tailed beast. Kurama reflects throughout Naruto's life in its attempts to break the seal by lending its power to the boy, failing to succumb to the fox's will and his numerous victories in battle.