Kakashi and Orochimaru: Face-to-Face!

is episode 40 episode of the original Naruto anime.

Synopsis
Kakashi threatens to kill Orochimaru, a threat that Orochimaru takes lightly. Despite this, Orochimaru decides to walk away. As he leaves, Kakashi admits to himself that he could not have killed Orochimaru on his own. Meanwhile, Shino and Zaku Abumi continue their match; though Zaku reveals he is in fact able to use both of his arms again, Shino ultimately wins his match through the deceptive use of his destruction bugs, leaving Kankuro and Misumi Tsurugi to fight next.