Naruto vs. Mecha-Naruto

is episode 377 of the Naruto: Shippūden anime.

Summary
Shikamaru is overwhelmed by Mecha-Naruto and continues to follow the group while firing missiles in the process. Chōji uses his Human Bullet Tank in an attempt to distract Mecha-Naruto but ultimately fails. Kiba and Akamaru transform into a double-headed wolf and attack using the Fang Passing Fang but is easily countered by the mecha. The palanquin carrying Naruto falls over since there was no one holding it. Neji is next to join the fray, using his Eight Trigrams Palms Revolving Heaven. Mecha-Naruto tries blasting the rotating shield with lasers, but to no effect. After dominating Neji's technique with high speed, Mecha-Naruto breaks through and eliminates him and Yamato. Kakashi uses his Sharingan in a failed attempt to defeat the mecha. Just as Naruto is cornered by his mechanised replica, Gaara arrives in time to save him. As he is about to crush Mecha-Naruto's arm, Deidara appears and taunts the latter, forcing the Kazekage to chase after him. Naruto and Mecha-Naruto are summoned into a snake's stomach by Orochimaru who reprogrammed Mecha-Naruto to obey him. Jiraiya appears and summons Gamabunta thus freeing them from the snake's stomach. Mecha-Naruto easily overwhelms Naruto who was nearly drained of the Nine-Tails' chakra. Mecha-Naruto changes its programmings – courtesy of Itachi – and returns the Nine-Tails' chakra back to Naruto. As Mecha-Naruto bisects Orochimaru in half to protect Naruto, he activates a switch, causing Mecha-Kurama to appear and causes mayhem at Konohagakure. Mecha-Naruto encases itself onto Naruto and battle Mecha-Kurama but their attacks have no effect whatsoever. Mecha-Naruto ultimately sacrifices itself to destroy Mecha Nine-Tails. While the villagers celebrate Naruto's victory, they are comically drowned by Gaara's Quicksand Waterfall Flow.

Trivia

 * Mecha-Naruto encasing Naruto into itself and how it functions as a suit is reminiscent to Iron Man.
 * Mecha-Kurama's attack on Konoha mirrors that of Pain's assault on the village.