Reunion (episode)

is episode 51 of the Naruto: Shippūden anime.

Synopsis
Yamato suggests that Sai's true objective in coming with them is to kill Sasuke, who, according to Danzō, is a threat to Konoha. Sai finds Sasuke, and instead of following his orders and killing Sasuke, Sai revealed that he wants to preserve Naruto and Sasuke's bonds. Sasuke expresses his anger at being woken up to be lectured on bonds by causing a giant explosion in his room, which attracts the attention of Sakura, Naruto and Yamato. As Naruto and Sakura meet with their former friend, Sai declares that he discarded his mission orders, and now wishes to aid Naruto in bringing Sasuke back to Konoha.

Credits
Reunión