The Mystery of Tobi
As Sasuke has finally fulfilled his goal in killing Itachi and avenging his clan, he collapses from exhaustion. The news of his victory reaches the Leaf ninja and Tobi, who both race towards Sasuke's location. What does Tobi plan to do with him and who will reach Sasuke first?
Aired 10/12/2009EP 139 - The Mystery of Tobi

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)