Clone vs. Clone: Mine are Better Than Yours!

is episode 36 of the original Naruto anime.

Synopsis
The team realises soon enough that the clones are not physical; they are in fact another genjutsu. In order to draw out the assailants, Naruto disguises several of his shadow clones as his team-mates and fights the enemy clones all night. When Team Oboro believe that the entire team was exhausted from combat, Kabuto, Sakura, and Sasuke corner them. After a brief struggle, Naruto knocks out the enemies and takes their scroll, at which point they head to the tower and meet with Kabuto's team. Unknown to Naruto and his friends, Kabuto submits all of the data he gathered on them to Orochimaru.