Naruto Season 5 - Episode 131: The Secrets of the Mangekyo Sharingan!

As Sasuke's remembrance of his childhood draws to a close, Sasuke returned home from the Ninja Academy one day to find all the members of the Uchiha clan murdered. Upon finding his parents' bodies, Sasuke discovered Itachi to be responsible for the massacre. Using his Mangekyō Sharingan, Itachi showed Sasuke their parents' deaths, causing Sasuke to run with fright. Itachi stopped him, telling him that he wasn't worth killing. As Itachi left, he informed Sasuke that if he wanted to take revenge for the clan, he would need to get stronger. To help Sasuke gain the strongest ability of the Uchiha, Itachi tells Sasuke the requirements to obtain his own Mangekyō Sharingan: He must kill his closest friend. With that, Itachi left, leaving Sasuke to build a hate for his brother. Resolving to get stronger, Sasuke decided he would do whatever was necessary to kill Itachi. Returning to the present day, Sasuke and Naruto resume their battle, with Sasuke stating that Naruto is his closest friend and that he must kill Naruto to achieve the power needed to kill Itachi. Copyright Disclaimer: Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.