The Secret Weapon is Called…

is episode 15 of the Naruto: Shippūden anime.

Synopsis
After the visions that Itachi makes him suffer, Naruto releases himself from the genjutsu with the help of Chiyo and Sakura. Distracted and immobilised by Kakashi's shadow clone, Itachi takes a direct hit from Naruto's Big Ball Rasengan. Meanwhile, Neji frees himself, Rock Lee, and Tenten after Guy defeats Kisame. Later, the two Konoha teams find out that the two foes that they just defeated are neither Itachi nor Kisame, but two entirely different people, who the Akatsuki leader used to stall the Konoha teams.