"Lockdown of Darkness" (暗黒の施錠, Ankoku no Sejō) is episode 65 of the Naruto: Shippūden anime.
Konohagakure struggles to defend against the four attackers who have sealed the entire village behind a barrier. Asuma, commanded by Tsunade to follow Sora and Naruto, finally catches up to them. Asuma realises that the four invaders plan to annihilate the entire village using the lightning powers of the corpses that they stole, shocking Sora. Leaving to help hold off the attackers, Asuma instructs Naruto to continue pursuing Sora.