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Karthon the Questor battles Namor for the crown and is defeated. He reveals to Namor the history of the Serpent Crown and of the mad tyrant Naga. Unfortunately, Captain Barracuda captures them both on his way to steal an atomic weapon. Sub-Mariner frees himself but must decide to pursue Karthon who has fled with the Serpent Crown or stop Captain Barracuda's atomic torpedo!