While our heroes are visiting their friend Sanpei's home in Ninja Village, Chief Hanzo is captured by a group of mysterious ninjas! Their leader is Kagetomo, a gifted ninja who has decided that he should be chief in Hanzo's place. Sanpei and his brothers are determined to free their chief, and they confront Kagetomo and his forces head on, with the help of Ash, Serena, and Clemont. During the battle, Ash's Frogadier evolves into an immensely powerful Greninja! The ninja force is defeated, and Kagetomo sees the error of his ways and decides to refocus on his training. Ash and friends stay to enjoy the village festival, where Hanzo names Sanpei's oldest brother, Ippei, as the next chief. After our heroes depart, the middle brother, Nihei, tells the others that he saw something in Ash's Greninja that reminded him of the village's ancient hero...