Formation! The Sasuke Retrieval Squad (結成!鉄壁のフォーメーション, Kessei! Teppeki Fōmēshon) is the episode 110 of the original Naruto anime.
When Sakura wakes up, Izumo and Kotetsu find her lying on the bench, who she tells of Sasuke's defection, and later, the two would inform to Tsunade. Unable to send higher ranking ninja after Sasuke, Tsunade orders Shikamaru to assemble a team of genin under his lead to go after Sasuke. He selects Naruto, Neji, Chōji, and Kiba, and quickly devises the optimal formation for the group. Before they leave, Sakura comes and pleads Naruto to make sure to bring Sasuke back. Naruto promises to do so, and the group sets out. Meanwhile, when they already pass the Hidden Leaf Village, Sakon along with the rest of the Sound Four tells Sasuke of an important task Orochimaru had given them: Sasuke must die just this once.