"Collision…!!" (衝突…!!, Shōtotsu…!!) is chapter 356 of the original Naruto manga.
Naruto and Sasuke notice that they are being followed. Sasuke is confronted by Tobi, who distracts Sasuke while Deidara attacks him. Naruto is greeted by Kabuto, who gives him a black book with information regarding the Akatsuki. When asked why, Kabuto says it is to thank Naruto for being an "inspiration". When asked why, Kabuto describes how Naruto has always struggled to distinguish himself from the Nine-Tails sealed within him, just as Kabuto always struggled to find autonomy from service to others. Following Naruto's example, Kabuto has opted to become strong enough to never need to serve someone again by integrating Orochimaru's remains into his body, thus making half of him Orochimaru.