The Medical Ninja's Student

is episode 11 of the Naruto: Shippūden anime.

Synopsis
Chiyo's assault on Kakashi is stopped due to Naruto's quick use of shadow clones. After her brother tells her to look closer, Chiyo realizes that Kakashi only bares resemblance to the White Fang of the Konohagakure, who is actually his father, but is not actually him. She plays it off by saying that she pretended to be senile. Meanwhile, Sakura has everyone leave the room as she begins her examination of Kankurō. She discovered that the poison in his body was one that destroyed the cells after infiltrating the muscles. Sakura then has Sekka and Ryōkan gather some materials for her.

Meanwhile, Akatsuki continues their extraction of Shukaku from Gaara's body.

As Sakura begins the procedure, she has the others hold Kankurō down while she begins. She sends chakra into his body, draws the poison from the cells, absorbs it into a liquid and pulls it out. After a while, she removes most of the poison from his body to the point where his life is no longer in danger, but she's far from done.

A bird arrives with a message from Tsunade informing them that Guy's team has been sent as reinforcements and will be arriving soon. As Kankurō regains consciousness, he informs that that he had taken a piece of the enemy's clothing with which they could use to track them. Marvelling at the resilience of Suna ninja, Kakashi summons his pack of ninken and they begin tracking the enemy after getting a whiff of Sasori's mask.

Sakura administers an antidote that should clear up any residual poison in his body and tells him to rest. Before Team Kakashi sets out, Kankurō pleads to Naruto to help his brother who accepts.