"Raging Tailed Beast" (荒れ狂う尾獣, Arekurū Bijū) is episode 99 of the Naruto: Shippūden anime.
Following Sasori's demise, Tobi is partnered with Deidara as the duo begin their hunt for the Three-Tailed Turtle. By the lake, Yūkimaru releases his chakra and summons the Three-Tails while Kabuto exclaims that their plan has succeeded.
In the woods, Rinji's bats report to him that there are more shinobi pursuing them. In order to thin the herd, he asks Kihō to use his Wrist Launcher to deploy a smokescreen. Before the group can dive into the smokescreen, Shino, Kiba and Akamaru detect a strong chakra coming from the lake. Kakashi notifies them that their goal is to head to the lake and thus sends Naruto on his own, relying on Naruto's adept survival capabilities and his unpredictable manoeuvers, while the others deal with Team Guren inside the smoke.
Yūkimaru passes out from overexertion while Kabuto orders Guren to restrain the Three-Tails. With Gozu providing reinforcement, Guren uses her Crystal Release: The Gods' Crossings Technique to repress the tailed beast, although to no avail. Eventually, Guren manages to trap the beast with her Crystal Release: Jade Crystal Wall Eighth Formation. Meanwhile, Naruto traipses through the fog and ends up falling off a cliff and plummeting into the water, leaving him to summon Gamatatsu and Gamakichi in order to save him. Riding on Gamatatsu, the trio wade through the water until they reach the encased beast, and Gamakichi fearfully notifies Naruto that it is none other than the Three-Tailed Turtle. Naruto also spots Yūkimaru and realises that Yūkimaru's "home" was Guren and Kabuto. As the Three-Tails makes contact with Naruto, it breaks out of its confines and begins its rampage.
Back on land, Guren's team prepares to ambush the search team from above when Hinata, using her Byakugan to spot them, warns them of the attack. She, along with Sakura and Sai, counter the ambush and force Team Guren to retreat. Kakashi senses something amiss as the Three-Tails begins its rampage and the smokescreen clears away, only to reveal a large body of water headed their way. In the lake, Guren attempts to strike the tailed beast but fails, and in an attempt to protect her, Yūkimaru unleashes his chakra once more in order to control and subdue the turtle. As both he and Guren fall into the water, Guren saves both of them. Yūkimaru then takes Guren's body to shore and promises her that this time it would be he who holds her hands.