"Kidnapped! Naruto's Hot Spring Adventure!" (ナルトの湯けむり珍道中, Naruto no Yukemuri Chin Dōchū) is episode 97 of the original Naruto anime.
On their way back to Konoha, Tsunade suggests the group to take a break at a hot spring town. During their stay, Naruto Uzumaki learns that Senta and Bunzō (two members of the Akagi gang) cannot return home unless they collect Tsunade's debts, and attempts to help the two. Shizune, fearing that Tsunade's debts, if exposed, would jeopardise her chances of becoming Hokage, disguises herself as Tsunade to stop Naruto, but neither of them realises that the debt had already been paid a time ago.