The Ten-Tails' Jinchūriki (episode)

is episode 378 of the Naruto: Shippūden anime.

Summary
As the Shinobi Alliance wonders about the Ten-Tails disappearing from the battlefield, Sakura asks Hinata to explain what happened, and it is explained that the beast's body and chakra were completely absorbed by the enemy. Naruto explains to Sasuke and Minato that Obito never tried to revive Madara from the beginning, but was actually making himself the Ten-Tails' jinchūriki. Hashirama and Tobirama soon realise how big of a threat just appeared, and the First Hokage pins Obito, only for the new jinchūriki to destroy both the restraints and the barrier with chakra arms. As Minato tries to call out to his former student, who barely recognizes his own name, the other reincarnated Hokage start attacking the enemy, using their immortality to study the enemy's power. His predecessors being easily knocked out, with Hashirama forced to take on Madara, Minato goes on the front trying to exploit Obito's inability to suppress the Ten-Tails. In his mind, Obito gets his consciousness ripped by the Ten-Tails but ultimately manages to take control the monster, gaining a new form and trying to kill the enemies in one single blow.

Trivia

 * When his memory of Rin was about to be torn away, Obito's hair was black again.