"The Star's Radiance" (星は輝きを増して, Hoshi wa Kagayaki o Mashite) is episode 183 of the original Naruto anime.
After Akahoshi tries to execute Sumaru, Hokuto and the rest of the children stand up to protect their village, revealing the poisoning caused by the star. After learning the truth, the adults turn on Akahoshi as well. After Akahoshi nearly kills Mizura, he is given no second chances. Not being one to lose, Akahoshi fuses his body with the Star, causing his chakra to go out of control. Naruto, guided by Natsuhi's spirit, destroys the star and defeats Akahoshi. Although Tsunade initially seems upset over Naruto failing the mission, she concedes that the mission was "trash" due to being ordered by Akahoshi himself, and heals the children of their poisoning.