Baron Dark develops a nearly-indestructible war craft, the Gorgon. Lightstar and Talyn approach the neutral ape-like Simianites in hopes to gain their alliance against Dark. But Dagger and Shriek have been sent as the baron's emissaries for a trade agreement, and with the locals taking any attempt at fighting as a potential crime, they're forced to use calm persuasion alone as their method. The Skeleton Warriors do everything they can to sabotage it by making them appear to be committing hostile or rude acts. Finally all four are imprisoned, and Grimskull and Guardian are forced to try to destroy the Gorgon alone. Meanwhile, Talyn and Lightstar learn that Dark's plans for it, and the Simianites, are bigger than they thought.