The Secret of Jinchūriki

is episode 16 of Naruto: Shippūden anime.

Synopsis
Kakashi and Guy's teams both figure out that their battles were only set-ups to delay them from rescuing Gaara. Chiyo goes on to explain that the tailed beasts' hosts were individuals burdened with the task of carrying the beasts within them, such as Gaara and Naruto, and that if their beast is removed, then they will die. As the two teams rest from their battles, the Akatsuki leader sends out Zetsu to dispose of Itachi and Kisame's clone's bodies.