The magician Cryslin requests Arthur's help in freeing her father, King Arthur's sorcerer friend Rigis, from a sea serpent. He accepts and goes with Lance, Tone, Breeze, Trunk, Gallup, and Everett, but Everett's falling off the wagon she turned invisible reveals them soon after. The Warlords attack the knights near a village where a group of boys assist them in the victory. But the men in the village fear the Warlords, who vow vengeance on them. The knights stay behind to defend it against their promised attack while Arthur, despite learning from Crislin that she was leading him into a trap in exchange for her father's life, goes with her anyway to defeat the serpent and rescue Rigis.