The Appearance of Strange Visitors

is episode 161 of the original Naruto anime.

Synopsis
Desperate to get as strong as he could before Jiraiya returned, Naruto sought out Might Guy and Rock Lee in hopes they would train him in taijutsu. Guy and Lee have left the village on a mission; meanwhile, Mondai and Potcha infiltrate the village to gather its secrets by disguising themselves as Guy and Lee. Despite their terrible disguises, Naruto fell for it and began following them all day. The rest of the village, however, easily saw through the impostors and decided to make them miserable by having "Guy" and "Lee" do all kind of horrific chores. While the two were miserable from doing so, Naruto cheerfully viewed this as another training session. After the impostors finally gave up and left the village, Naruto found the real Guy and Lee to thank them for the assistance in training, to which Guy and Lee had no idea what he was talking about.

Trivia

 * Suzumebachi, Sanshō, Sasame, Inari, Tsunami, and a well hidden younger Sasuke Uchiha all made a cameo in this episode.