Village in Distress: A New A-Ranked Mission!

is episode 69 of the original Naruto anime.

Synopsis
After Sakura awakened Naruto and discovered that Shikamaru had dispelled the genjutsu as well but was just faking sleep to avoid any conflict, Kakashi instructs them to track down Sasuke and stop him. Then after they have done that, they should wait and hide in a safe place and wait for further orders. Meanwhile, Orochimaru begins his battle with his former sensei, The Third Hokage. They both display powerful techniques in what the observing ANBU describes as a "Kage-level battle". Early in the battle, Orochimaru summons the First Hokage and Second Hokage from the dead to fight the Third. The risen Hokage apologise to their former student as Orochimaru prepares them for combat. The Second Hokage says that it is the forbidden technique Summoning: Impure World Reincarnation.