"Gotta See! Gotta Know! Kakashi-Sensei's True Face!" (見たい、知りたい、確かめたい カカシ先生の素顔, Mitai, Shiritai, Tashikametai Kakashi-Sensei no Sugao) is episode 101 of the original Naruto anime.
Naruto had started the idea of finding out what was under Kakashi's mask, which the two others, Sakura and later Sasuke, agreed on after being persuaded by the former. However, they were no match against Kakashi as he threw them off his trail again and again. They soon had a low-rank mission to tend the farm. They didn't notice that Moya Triad was following them, who wanted revenge on Kakashi. The trio were eventually uncovered and Kakashi left them tied up like he did three years ago. As the team left for Konoha after the mission, Naruto asked Kakashi outright what was under his mask. Kakashi agreed to show them, and each of them imagined what face their mentor has. After their intense anticipation, Kakashi finally took off his mask, only to reveal another mask underneath, making Naruto, Sasuke, and Sakura fall to the ground in horror while Kakashi laughed.