Gilgamesh has typical Eternal powers such as levitation/flight (around 600 mph), extreme longevity, virtual indestructibility, emission of heat/light/force blasts from his eyes and hands, matter transmutation (minor skill only), illusion casting, near-limitless stamina, and superhuman strength (class 100). He hand-crafts his own battle armor, and Sprite created space armor enabling him to function in a vacuum.
The Eternal most often known as “the Forgotten One” held many names over the centuries, but his true name remains a mystery. Around 3,000 BC, he became Gilgamesh, the king of Uruk in the Middle East. He quested for eternal life unaware that he was actually a member of the race of Eternals, able to live forever. He was thought to be the heroes Samson and Hercules, and befriended men such as Achilles, Aeneas, and King David.
Eventually learning his true nature, the Forgotten One was confined to a corner of the Eternal city Olympia by decree of the Eternals’ ruler Zuras, who said the Forgotten One had interfered with humanity too often. The Forgotten One obeyed this command until he was informed by Sprite that all the other Eternals were absent while their enemies, the Deviants, attempted to launch an assault upon the Celestials, the creators of both Deviants and Eternals. The Forgotten One set into space, stopped the Deviants, and was then taken aboard the Celestials' Mothership by the One Above All, leader of the Celestials.
The Forgotten One was christened “Hero” by the One Above All, and was returned to Earth to warn the Eternals not to interfere with the Celestials. He was welcomed back to Olympia by Zuras, and soon walked again in man’s world. The Forgotten One was one of the Eternals who elected to remain on Earth when most of the population departed to explore space. He aided his fellow Eternals against the Deviants’ attempt to revive the Dreaming Celestial, a rogue Celestial. When demons commanded by N’Astirh assaulted New York, the Forgotten One journeyed there to slay them, and wound up joining the Avengers at the end of the crisis, resuming his alias as Gilgamesh.Gilgamesh did not last long as an Avenger, eventually succumbing to battle fury while combating the Lava Men, an error that nearly led to his death at their hands. Learning that his departure from Olympia had weakened him, he spent most of his time within Olympia from that point on. The Forgotten One was later targeted for death by Immortus, but was eventually restored to life along with many other slain Eternals who were rendered amnesiac by the machinations of Sprite. Druig arranged for his memories to be restored, hoping to recruit him as an ally.