Atlantis

Atlantis is a legendary lost continent which sank beneath the waves, and was written about in Plato's Lost Dialogue. It was a highly advanced civilization, making use of the metal Orichalcum as a power source. The metal seems to have a much greater output than modern technology.

Atlantis had many known outposts, such as the Labyrynth on Crete.

During World War II, the Nazis-- particularly Dr. Hans Ubermann-- became obsessed with finding it. Meanwhile, Sophia Hapgood, a psychic in New York City, became popular giving lectures about the lost continent. Indiana Jones teamed up with her to beat the Nazis to the lost city.

Inhabitants

 * Nur-Ab-Sal - One of the Atlanteans who survived in godlike, or possibly spirit form. Sophia Hapgood was in contact with him, and he eventually posessed her.

Appearances
Indiana Jones and the Fate of Atlantis Indiana Jones and the Fate of Atlantis (comic)