Orochimaru, the strongest among the Three Legendary Sannins and shinobi teachers in Naruto, is one of the most incredible villains that Naruto fans ever experienced. Even in the beginning episodes of the series, Orochimaru was able to deliver thrilling entrances. To accomplish his ambition of becoming immortal and mastering every jutsu, Orochimaru tried to acquire Sharingan from Sasuke.
To add to that, Orochimaru conducted countless unethical experiments on human subjects. He believed that pushing the boundaries of the human body, no matter the cost, was the key to achieving his twisted ambitions. Edo Tensei or The Reanimation Justu is the technique that makes Orochimaru the most fearsome shinobi. By using Edo Tensei, Orochimaru summoned the first two Hokages; Hashirama and Tobirama, which were approved to be a fatal attack against The Third Hokage - Hiruzen Sarutobi.