In Tales of Suspense #28 we meet Titan, the Amphibian from Atlantis who invades the surface world and threatens to destroy it all. But a single human seemingly agrees to betray mankind and goes with Titan to his fellow creatures deep beneath the sea. There the human describes man as possessing great weapons and all but unbeatable. Though it means his death and the hatred of his fellow man, this single human's deception convinces the Titans that invasion is a waste of time. This is a singular story in one respect as according to sources Russ Heath, the famous artist for many a war tale and others over the decades inked Jack Kirby on this story.
More monsters rise next time.