The Power of the Uchiha

is episode 52 of the Naruto: Shippūden anime.

Synopsis
With his skills immensely improved over the years, Sasuke begins to attack Naruto with his sword, but Sai intercepts the attack. Sasuke keeps the two at bay with his Chidori Current. Sakura decides to charge at Sasuke, but Yamato jumps in front of her, only to wind up being stabbed by Sasuke's Sword of Kusanagi: Chidori Katana. As the Nine-Tailed Fox attempts to goad Naruto to use its power in his consciousness, Sasuke, using his Sharingan, appears in front of them. The Nine-Tailed Fox states that Sasuke's chakra reminds him of Madara Uchiha, before its chakra is totally suppressed by Sasuke.