The Quietly Approaching Threat

is episode 72 of the Naruto: Shippūden anime.

Synopsis
Asuma apologized at the grave of the Third Hokage for not understanding his advice concerning who the "king" of the Land of Fire was. At the hospital, Naruto and Sai recovered, and Naruto resumed his training. Tsunade received a report from Kakashi that Akatsuki was once again on the move. Elsewhere, Yugito Nii, the Two-Tailed Monster Cat Jinchūriki, struggled against Hidan and Kakuzu, unleashing her beast form, but was defeated and captured. Hidan and Kakuzu then turned their attention to the Land of Fire for their next target.