The episode focuses almost entirely on Kabuto's backstory through a series of intense flashbacks while he is trapped in Itachi Uchiha's loop.
It transforms Kabuto from a generic "right-hand man" into a complex, sympathetic figure whose search for identity mirrors the series' central themes. (Dub) 336 : Kabuto Yakushi
During a mission in the Village Hidden in the Stones, Kabuto accidentally mortally wounds a fellow spy—who turns out to be Nono. In a heartbreaking moment, she does not recognize him due to Danzo's psychological manipulation, leading to Kabuto's identity crisis. The episode focuses almost entirely on Kabuto's backstory
In the aftermath of his despair, Kabuto is approached by Orochimaru , who reveals the full extent of Danzo’s betrayal. Orochimaru offers Kabuto a new "purpose," leading to their long-term partnership. Why This Episode is "Useful" In a heartbreaking moment, she does not recognize
It sets the stage for Itachi’s use of the Izanami, explaining why Kabuto is the perfect target for a jutsu designed to force one to accept their true self.
Provides crucial insight into the inner workings of the Foundation (Root) and the moral grey areas of the Shinobi world.
For further details on the characters involved, you can explore the Kabuto Yakushi character analysis or check the episode breakdown on Narutopedia .