Reunion / The Power of Uchiha.Episode 51 Reunion: Yamato suggests that Sai's true objective is to kill Sasuke, who, according to his master Danzo, is a threat to Konoha. Sai enters Sasuke's room and wakes him up. But instead of following his orders and killing Sasuke, Sai reveals that he wants to preserve Naruto and Sasuke's bonds. Sasuke retaliates by causing a giant explosion in his room, which attracts Sakura, Naruto and Yamato's attention. As Naruto and Sakura meet with their former friend, Sai declares that he is discarding his mission orders and now wishes to aid Naruto in bringing Sasuke back to Konoha.
Episode 52 The Power of Uchiha: With his skills immensely improved over the years, Sasuke begins to attack Naruto, but Sai intervenes. Sasuke keeps the two at bay with his Chidori Current. Sakura decides to charge at Sasuke, but Yamato jumps in front of her, only to wind up being stabbed by Sasuke's Chidori-infused katana. Deep within his conscious, remembering what Yamato told him, Naruto attempts to resist the Nine-Tails's goading before the fox attempts to goad Naruto to using its power. However, Sasuke uses his Sharingan to enter Naruto's mind and stop him from reaching the Nine Tails. With Sasuke meeting him for the first time, the Nine Tails compares Sasuke's chakra to that of Madara Uchiha before being totally suppressed by the young Uchiha. As his chakra dissipates, the Nine-Tails warns Sasuke not to kill Naruto.