The End Naruto: Shippûden : Season 6 Episode 138

Sasuke thinks that he's finally killed Itachi with the help of his most powerful technique, Kirin, but Itachi still has one final trick up his sleeve. Having used both Tsukiyomi and Amaterasu, Itachi calls upon the power of his third and final Mangekyo ability, Susano'o. Itachi has turned the tide of the battle against Sasuke, but the latter receives aid from an unexpected source. The battle between the Uchiha brothers is nearing its shocking conclusion!