While Lion-O and Panthro are building a defensive wall, a landslide injuries the Rockmen prince, Pek. Goaded into believing it was an intentional attack, the Rockmen king, Tork, sends his people out to attack the ThunderCats. When Snarf is seriously injured, Lion-O leads the ThunderCats in a counterattack. A wobbly Snarf follows and must make peace with the prince when the two sides are in an all out battle.