While technically classified as a filler arc because it is not adapted from the original manga chapters, many fans consider the Itachi Shinden arc (Episodes 451–458) essential viewing. It provides critical psychological depth to Itachi, explaining the motivations behind his future actions that shaped the entire Naruto universe.
Envisions a life free from the "troublesome" responsibilities of marriage. Naruto Shippuden Episode 451
A young Itachi, only four years old, witnesses the aftermath of the Third Great Shinobi War. After showing mercy to a dying enemy who then tries to kill him, Itachi is forced to take his first life, leading him to question the value and meaning of existence. While technically classified as a filler arc because
The episode poignantly juxtaposes Itachi’s exposure to death with the birth of his younger brother, Sasuke, which gives him a new sense of purpose and "life". Critical Reception and "Filler" Status A young Itachi, only four years old, witnesses
Amidst this global trance, Team 7 remains protected within Sasuke’s Susano'o, the only barrier against the moonlight that triggers the jutsu. A Shift to the Past: Itachi's Light and Darkness
Sees himself finally achieving the title of Hokage.
The episode opens with the devastating realization of the Infinite Tsukuyomi . As Madara Uchiha’s ultimate genjutsu takes hold, the world is plunged into an eternal dream. We witness various shinobi trapped in their own idealized realities: Dreams of a peaceful life with Naruto.