She first appeared in Tales of Suspense #43 (July 1963) and was created by Stan Lee, Robert Bernstein, and Jack Kirby.

Netheria was once a city on the continent of Atlantis, which was enclosed in an airtight dome to protect itself from the Deviant empire located in Lemuria.

Netheria sank to the bottom of the sea and further through it every year, in a huge cavern beneath the floor of the Atlantic Ocean, in part of what is now known as Subterranea.

Tony Stark became encased in a crystalline substance that sank into the Earth, transporting him to the Netherworld, after a guard and a scientist were teleported before him.

Realizing that her people could not live on the surface world, she renounced her plans of conquest, and was returned to the Netherworld which restored her youth.

[5] Kala is actually centuries old, but remained a beautiful, robust young woman, until recent times due to the unexplained atmospheric effect in subterranean "Netherworld".