Tales to Astonish #97

Namor is on Skull Island in the Savage Land as a prisoner of the Plunderer. The villain tries to entice the Sub-Mariner into becoming his partner in world conquest by trying to impress him with his powerful vibra-gun constructed from Plunderstone (the Savage Land's version of vibranium). When the local Swamp Men attack, Namor is freed and the Plunderer's base begins to burn to the ground. Namor escapes from the inferno but not in time to stop the Plunderer from escaping in his powerful submarine. The villain decides to attack Atlantis in retribution for all of the trouble Namor has caused him.