The Unfinished Page

is episode 46 of the Naruto: Shippūden anime.

Synopsis
Yamato tells Naruto not to rely on the Nine-Tailed Fox's chakra, as Naruto is strong on his own. The Konoha team decides to browse Sai's book to give them some clue about him, and they notice that it's filled with the story of two boys' paths and battles. However, the pages where the two boys would meet are unfinished. Meanwhile, Orochimaru's group reach their hideout, not realising that Yamato's wood clone had spotted them. There, Sai confronts a shadowed Sasuke, realising that this is the man whom Naruto and Sakura have been searching for.