 During the Vietnam war, the two had a sexual encounter, and Thena discovered she was pregnant.Using her powers, she secretly implanted the embryos into an infertile human woman, and the two grew up unaware of their ancestry.When Dr. Daniel Damian, a human who was aware of the existence of Deviants and Eternals, sent a monster (formerly Ajak) to slay the two children, killing numerous other sets of twins in the process, Thena took the two to Olympia, the city of Eternals, but did not inform them of their heritage.