Target: Locked On

is episode 83 of the Naruto: Shippūden anime.

Synopsis
Tsunade tells Sakura that Team 7 will be Team 10's backup, but only if Naruto finishes his training within 24 hours. Elsewhere, Shikamaru quickly adjusts the team's strategy to include Kakashi. After Hidan and Kakuzu were found by Ino, Shikamaru pins their shadows with Asuma's chakra knives imbued with his chakra. Using his Shadow Imitation Technique, he forces Hidan to attack Kakuzu, but Kakuzu dodges the attempt, after revealing that he had secretly detached his arm during Shikamaru's previous attack to remove the chakra knife pinning his shadow. With Kakuzu cornered, Chōji then attacks Kakuzu from above.

Trivia

 * This episode has two animation errors:
 * When Shikamaru snares Hidan and Kakuzu in the trap, when it shows Kakuzu looking down, the crossed-out Takigakure symbol on his head band isn't there.
 * In the English dub, while Shikamaru is discussing the plan to Team Asuma, he states Hidan and Kakuzu are going after "the jinchūriki within Naruto", instead of "the tailed beast within Naruto".