A Shadow in Darkness: Danger Approaches Sasuke

is episode 51 of the original Naruto anime.

Synopsis
Despite having formulated a strategy beforehand, Chōji quickly loses to Dosu, concluding the preliminaries. The nine qualifying Genin are assigned opponents, and they are all allowed to leave for a month of training before the finals. Elsewhere, Kabuto prepares to kidnap Sasuke under Orochimaru's orders, but he is stopped by Kakashi and is forced to retreat. Naruto later meets with Kakashi in hopes of training with him for the finals. Kakashi, planning on training Sasuke instead, offers Ebisu as a trainer for Naruto.