Titan, the Amphibian from Atlantis!

One month before Sub-Mariner regained his memory as the Prince of Atlantis in Fantastic Four #4 (May 1962), a very different Atlantean appeared in Tales of Suspense #28 (April 1962). In that tale, a water-breathing giant named Titan communicated telepathically to the residents of Manhattan. When Titan offered untold wealth to anyone willing to describe humanity's weapons and defenses, an automobile industrialist named John Cartwright jumped at the offer. Upon arriving in Atlantis, however, Cartwright told the giant amphibians that humans possessed weapons powerful enough to destroy the underwater civilization, deterring them from attacking the surface world.

Fantasy Masterpieces #7 (Feb. 1967) and Uncanny Tales from the Grave (Oct. 1975) reprinted this creative tale, titled "Titan, the Amphibian from Atlantis!" Throughout this time period, the science fiction and fantasy titles published by Marvel Comics did not inherently occupy the shared universe of superheroes … making room for these Atlanteans to be vastly different from Sub-Mariner's people. In contrast, a prior take on Atlantis from Amazing Adventures #2 (June 1961) became Aquatica when reprinted in Weird Wonder Tales #22 (May 1977), as the updated version helped establish Dr. Druid as a costumed hero.

As an aside, as compelling as Sub-Mariner could be as a character, his homeworld generally lacked the imagination of Titan's version of Atlantis or the lost city renamed Aquatica.