"Pure Terror! The House of Orochimaru!" (恐怖!大蛇丸の館, Kyōfu! Orochimaru no Yakata) is episode 139 of the original Naruto anime.
Sasame leads Naruto, Jiraiya, and Sakura to Orochimaru's hideout. They send Sasame back to the village because of the danger level. Jiraiya summons Gamakichi to go in first and investigate. The four come to three tunnels. Jiraiya goes off to the right where he is seduced by a young lady with a musical instrument and gets trapped there. Naruto and Sakura go down the middle, Naruto encounters a trap and falls under the water with a big rock block above him due to which he is unable to escape. Sakura, determined to find Sasuke moves on and finds herself in a large hallway. Meanwhile, Gamakichi goes down the left and later meets Naruto. As Sakura enters a large vacant room, she encounters Kabuto and Orochimaru, who already have the upper hand. Sakura tries to get past Kabuto but is unsuccessful.