The Infiltrator

is episode 217 of the Naruto: Shippūden anime.

Synopsis
As Sakura administers the antidote, the team heads back to the Land of Iron to retrieve the other members of Sakura's team. After they are retrieved they head back to Konohagakure with Karin in custody. They are stopped by members of Root who demand that Sai tell them everything that happened. Sai confirms that Danzō was indeed dead and that they should discuss the future of Root with the new Hokage — Kakashi. Meanwhile, in Kumogakure, A and a small team head to the Lightning Daimyō's residence to inform him of the shinobi alliance and the upcoming war. Elsewhere, Black and White Zetsu regroup and it revealed that Kisame did not actually die but it was a clone of Zetsu that was decapitated instead, while Kisame had successfully infiltrated Kumogakure by hiding inside of Samehada.

Trivia

 * In this episode, there are two errors:
 * Karui and Omoi are briefly shown with a Konohagakure forehead protectors.
 * The outline of Kakashi's mouth can also be seen clearly beneath the mask.