洛奇、科特和唐唐是三個學功夫的小子,他們回日本參加典禮,在典禮中轉贈一柄在五十年前贏得刀給贏家。師父向他們證實這刀關係著黃金洞穴的秘密,所以他希望這三個小鬼可以贏得這次的比賽During a championship baseball match, the three brothers hear that their grandfather in Japan is in trouble, and head out to help him, conceding the match. When they arrive in Japan, they must use all their powers to defend him against his ancient enemy, who has returned to exact revenge.