Neptune first appeared in Tales to Astonish #70 and was adapted by Stan Lee and Gene Colan.

Neptune is responsible for the evolution of Homo mermanus, and is still honored by the Atlanteans, unlike many Olympians who have little or no worshippers on Earth.

[1] In modern times, Neptune sent Namor the Sub-Mariner on a quest for his trident in order to regain the Atlantean throne, appearing before him at various points.

[4] Later, Neptune healed a wounded Namor, and transformed a drowning stallion into a giant seahorse.

In a weakened state, he was abducted by Hippolyta and her Amazon warriors, at the behest of Hera and Pluto, who forced him to cede his shares of the Olympus Group to them, facilitating their takeover.

[10] Neptune possesses the typical powers of an Olympian, including immense strength, stamina, durability, speed, and healing, as well as virtual immortality.