Naruto: Shippuuden

Synopsis

During the Third Great Ninja War seventeen years ago, a 13-year-old Kakashi Hatake is just promoted to Jonin with his mentor, the future Fourth Hokage Minato Namikaze, and Rin Nohara giving him gifts. Only Kakashi's other teammate and rival, Obito Uchiha, forgot to bring a present. Soon after, Minato tells his students of their mission to destroy Kannabi Bridge so they can cripple the ninja from the Hidden Stone Village. Along the way, Team Minato is ambushed by Hidden Stone ninja named Mahiru with Kakashi seeing it as an opportunity to try his newly developed jutsu: the Chidori. However, with Kakashi's attack unable to land a hit on his target and Obito is too frightened to fight, Minato personally eliminates Mahiru. Minato then tells Kakashi not to use the Chidori due to its vertigo effect while criticizing Obito for not being able to act on his words. That night, unable to sleep, Obito learns from Minato that Kakashi's mindset is the result of his father Sakumo Hatake bring ostracized for putting his teammates ahead of the mission. The next day, left in charge as Minato heads off, Kakashi leads Rin and Obito into enemy territory before they are attacked by the Hidden Stone ninja Kakko and Taiseki who abduct Rin. Having accepted Kakashi as leader prior, Obito punches him for putting the mission before Rin as he runs off to save her. When Kakashi tries to stop him telling him what happens to ninja who break the rules, Obito says he does, and that's why he believes that Kakashi's father was a true hero, and commenting that those who break the rules maybe scum, but those who abandoned their comrades are worse than scum, before he leaves.

(Source: Wikipedia)

Note: Originally aired together with episode 120 as a double episode special under the title "Kakashi Gaiden: Senjou no Boy's Life (カカシ外伝～戦場のボーイズライフ～ ; Kakashi Chronicles - A Boy's Life on the Battlefield)"