Fist of the North Star S03 E10 Clash of the Polar Stars, Ken vs. Souther! My Star is the Only Protector of Heaven!!

Before accepting Kenshiro's challenge, Souther recites his tragic childhood and his motive for building the Holy Cross Mausoleum. Ken fights Souther again and struggles, until he finally fathoms the secret behind Souther's invulnerability.