The Coming of the Sub-Mariner!
Out on his own, Johnny encounters and helps restore the memory of a fallen hero, the Namor the Sub-Mariner! When Namor returns to his undersea kingdom and finds it decimated, he assumes the surface world is the cause and unleashes a powerful monster onto New York City and the Fantastic Four.
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Solid issue, the first appearance of the Sub-Mariner in the Silver Age. Namor comes back with his vengeance. He starts a full-scale invasion of the New-York, but was stopped by the FF.
(Cover date: May, 1962)