"Pure Betrayal and a Fleeting Plea" (清き裏切り はかなき願い, Kiyoki Uragiri Hakanaki Negai) is episode 138 of the original Naruto anime.
The three servants of Orochimaru from the same clan as Sasame attack Naruto and Sakura with the spider webs. Naruto tries using shadow clones but the enemy brings down the whole arena and Naruto and his clones fall beneath the sand. Jiraiya arrives, summons a big toad and takes Naruto away to safety along with Sakura and Sasame. Later, when Jiraiya decides to halt for a lunch rest, Sasame drugs Naruto, Sakura and Jiraiya, by giving them a sleeping potion mixed in the tea. She prepares to let them be given to Orochimaru in order for her to be led to Arashi. When she discovers that they were to be killed, she begs the ones about to do so to stop. Naruto reveals that he and the others faked being put to sleep, and attack. Kagerō attacks Naruto and Jiraiya with a powerful technique that shortens her life, then escapes with Jigumo and Kamikiri. Later, Sasame tries to kill herself with a Shuriken but is stopped by Naruto. She confesses that she was a fool and she is guilty that she tried to give them away to Orochimaru. When Jigumo and Kamikiri discover that they were being used by Orochimaru, they attack him, but are apparently killed by the latter.
When Naruto uses the Rasengan at the beginning of the episode, he calls it by both the rōmaji and the literal English. This is likely a dubbing error as this is the only episode where this occurs.