Eye of a Hawk

is episode 114 of the Naruto: Shippūden anime.

Synopsis
Orochimaru reminisces about the memories of his past, how he became interested in reanimation and the Sharingan. Orochimaru begins the ritual to take over Sasuke's body. Later on, Kabuto arrives to see Sasuke standing over Orochimaru's snake corpse, and from the Sharingan, he finds out what happened: Orochimaru had failed in possessing Sasuke's body, as Sasuke manages to reverse Orochimaru's Jutsu and absorbs Orochimaru into his body.