Karthon was the leader of the Questers, a group formed at the orders of Naga, to find the lost Serpent Crown and restore Naga's immortality. Karthon was stopped from returning the crown by Namor the Submariner, but before they could finish their fight over the crown, they were captured by Captain Barracuda. When Namor broke free from their imprisonment, Karthon took the crown and tried to return to Lemuria, but Namor caught up with him again. Karthon won the ensuing fight and returned to Lemuria with Namor under his control.[citation needed]

He returned the crown to Naga and realized that his king was mad when Naga claimed to be restored to his youth and killed the other Questers. Naga then had a young woman killed, who had looked like Lady Dorma, but was in fact Karthon's sister, Llyna. When Karthon realised this, he killed Naga, after which he was made King of Lemuria.[citation needed]

He was overthrown by the half-Lemurian mutant Llyra, but restored to power when he and Namor defeated Llyra.[1]


Karthon possesses the conventional attributes of Homo mermanus: gills that extract oxygen from water, superhuman physiology to withstand extreme pressures and temperatures, and acute vision. He can swim at approximately 30 miles per hour. He can remain out of water for approximately nine minutes before beginning to suffocate. However, he can operate on the surface by wearing a water-filled helmet or using a chemical that enables him to draw oxygen from the air.

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