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 and an omake episode 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. They soon had a low-rank mission to tend the farm. They didn't notice that Moya Triad is following them, who will have their revenge on Kakashi. As the team left for Konoha after the mission, Naruto asked Kakashi outright what was under his mask. Ironically, Kakashi agreed to show them, and prepared to take it off. After their intense anticipation, Kakashi finally took off his mask, only to reveal another mask underneath that was lighter in colour. While taking off his mask, he says, it's another mask, making Naruto, Sasuke, and Sakura fall to the ground in horror while Kakashi laughed.