"An Unrivaled Match: Hokage Battle Royale!" (古今無双!『火影』というレベルの戦い, Kokon Musō! "Hokage" Toiu Reberu no Tatakai) is episode 71 of the original Naruto anime.
The Hokage battle begins, and all three Hokage exchange varying elemental attacks. To help him in the uneven fight, the Third Hokage summons Monkey King: Enma and has him transform into a staff. In response, Orochimaru brings out his Kusanagi sword. The Third is repelled by the First Hokage and Second Hokage, and he discovers that they cannot be damaged in their present state. Orochimaru then peels his face off and reveals the face of a girl, shocking the Third Hokage, who expresses surprise that Orochimaru had mastered another forbidden technique. Meanwhile Sasuke finally manages to catch up to the Three Sand Siblings.