Orochimaru reveals the true purpose of his research: Immortality . He peels away his face to show the stolen body of a girl, explaining his Living Corpse Reincarnation technique. He openly admits his goal is to take Sasuke’s body next.
Since there are multiple series in the Naruto franchise, this report covers both and Naruto Shippūden Episode 72 , as they mark critical turning points in their respective arcs. Naruto Episode 72
Regretting his past failure to stop Orochimaru, Hiruzen prepares the Dead Demon Consuming Seal , a forbidden technique developed by the Fourth Hokage that requires the user’s life as a sacrifice. Orochimaru reveals the true purpose of his research:
Watch the intense moment Hiruzen Sarutobi prepares his final stand against Orochimaru's forbidden techniques: Since there are multiple series in the Naruto
This episode features a significant flashback of Team Minato (Minato, Kakashi, Rin, and Obito).