"Clone vs. Clone: Mine are Better Than Yours!" (分身対決!オレが主役だってばよ!, Bunshin Taiketsu! Ore ga Shuyakudattebayo!) is episode 36 of the original Naruto anime.
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 teammates and fights the enemy clones all night. When Team Oboro believe that the entire team is exhausted from combat, Kabuto, Sakura, and Sasuke corner them. Sasuke orders Naruto to take a break, as he had used a lot of chakra and should be unable to move; however, Naruto rushes forward and punches all three of the Ame genin, surprising Sasuke, Kabuto and Sakura, with Kabuto realising that Naruto's chakra levels must be exceedingly high to still be able to fight after pulling off a Multiple Shadow Clone Technique along with a Transformation Technique. 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 is revealed to be a spy from Otogakure, and submits all of the data he gathered on them to his master, Orochimaru.