Itachi's Story: Light and Darkness - The Darkness of the Akatsuki
Itachi becomes a rogue ninja and joins the Akatsuki. He is welcomed and introduced by Pain and Orochimaru as the ex-Leaf ANBU and the man who massacred his entire clan. Itachi is paired up with a man named Juzo, and their first job together is to fulfill an assassination request in the Land of Water.
Aired 14/04/2016EP 456 - Itachi's Story: Light and Darkness - The Darkness of the 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)