Hidden Jutsu! The Price of Ninja Art: Kujaku

is episode 180 of the original Naruto anime.

Synopsis
It is revealed that the masked ninja who stole the star is Sumaru's mother, and that Akahoshi is the one who kidnapped Sumaru. The group learns that the star training is potentially fatal to the ninja who take part in it, but resolve to find the star. Tenten and Lee infiltrate Akahoshi's residence and rescue Sumaru. Meanwhile, Akahoshi approaches Natsuhi and demands the star in exchange for Sumaru, and the two fight. While Natsuhi gains the upper hand, Naruto and Lee intervene for Akahoshi, and Naruto manages to get close enough to punch Natsuhi. After he does, Akahoshi launches an attack at the two of them, dropping them into the Valley of Death.