Hugh Klein was an American Astronaut on Apollo XXV, the last manned Moon mission. While on the Moon, Hugh discovered an ancient structure, thereafter referred to as the 'Lunar Villa'. Inside, Hugh finds an infant girl in a cradle, and is then confronted by a ghostly consortium identified as The Hundred. Caelius, speaker for the Hundred, explained how they were a group of scholars and philosophers devoted to peace who fled Rome during the time of the emperors. Using alchemical processes, they created the Lunar Villa and attempted to create a champion of their peaceful ideas on Earth. Unfortunately, they accidentally created the villain known as Valkus, the Centurion instead. To atone for this mistake, and to perpetuate their beliefs, they created a child they called the Praemonstra Supra, meaning "She Who Will Point the Way'. Hugh returned to Earth with the infant child, and he and his new wife, Jenny, were allowed to adopt and raise the infant, whom they named Laura. Although Laura exhibited no outward super powers, she was always a brilliant and athletic child. When Laura turned 16, her powers of gravity control manifested. Hugh and Jenny explained Laura's origins to her, and she and Hugh travelled to the Lunar Villa, where the ghostly remains of the Hundred explained her origin and their purpose to them. At this point Laura embarked on her career as Laurel, the Moon Maiden. She soon made many friends among the superhero community, was an early member of the Justice League, and shared at least one adventure with the Teen Titans. Throughout this time, her most frequent opponent was the Centurion.