Deep Cover?! A Super S-Ranked Mission!

is episode 136 of the original Naruto anime.

Synopsis
Jiraiya begins to worry about Naruto and Sakura's well-being. He then requests that Tsunade send the two on a mission with him. He finds Naruto telling Sakura he is not going to stop her from going after Sasuke, but he is going with her, and tells them about the mission. They head off to the Land of Rice Fields to find the Hidden Sound Village, and hopefully Sasuke as well.