The son of an Asgardian god and a mortal woman, Vali traded the pick of his future offspring to the Troyjan race in exchange for knowledge of immortality. Agamemnon neither claims nor denies being the Agamemnon who was king of Argos and commander-in-chief of the Greek army against Troy in ancient times. Since that time, he claims to have assumed dozens of identities and have fathered hundreds of children. At a relatively recent point in time, Agamemnon was instrumental is establishing the Pantheon, an interventionist think-tank dedicated to improving the human condition by ending war, famine, and disease. He has often recruited several of his own family, who exhibit superhuman abilities such as near-immortality due to their hybrid nature. No one recently has seen Agamemnon personally, as Agamemnon prefers to use a holographic projection to communicate with others while residing within the Pantheon's headquarters. (It is not yet revealed whether Agamemnon's holographic projection is technological, magical, or psychic by nature, and the true limits to the range and size of projection is unknown.)
Ultimately, he betrayed the Pantheon, and when his children became aware of the betrayal he attempted to slay them all. While trying to escape, his rocket was shot down, and he seems to have died.
Fighting skills: Excellent hand-to-hand combatant, but has been out of practice for several decades
Superhuman physical powers: Agamemnon has either an extremely long life span or virtual immortality; in his true form, he still appears to be an adolescent.
Agamemnon told The Hulk that one of the times he went out into the world was during the Second World War where he had many adventures. This coupled with his youth and appearance led many readers to believe he was Bucky Barnes, Captain America's deceased teen partner from the 1940's.