Invasion of Akatsuki
Naruto proceeds to the next step of his training, the cutting of a waterfall. Hidan and Kakuzu reach the Fire Temple and fight Chiriku, so as to obtain the bounty on his head. After defeating him, they move out to claim the bounty and thereafter target the Nine Tails Jinchūriki Naruto.
Aired 28/08/2008EP 73 - Invasion of Akatsuki
Naruto: Shippuden
Naruto: Shippuuden is the continuation of the original animated TV series Naruto. The story revolves around an older and slightly more matured Uzumaki Naruto and his quest to save his friend Uchiha Sasuke from the grips of the snake-like Shinobi, Orochimaru. After 2 and a half years Naruto finally returns to his village of Konoha, and sets about putting his ambitions to work, though it will not be easy, as he has amassed a few (more dangerous) enemies, in the likes of the shinobi organization; Akatsuki.
(Source: Anime News Network)