Aaron was the son of Owen Reece, known as the Molecule Man. Aaron had a difficult childhood growing up, with father being a villain and his parents would always fight and argue, eventually his father was arrested and his mother had went away, leaving him all alone. Aaron was able to recover his fathers wand as the last thing he has from him and kept it away from those who would take it from him.
Hawkeye and Black Widow were looking for Molecule Man only to encounter his son Aaron who was being targeted by A.I.M. when he was in the possession of his father's wand. After ditching A.I.M., Aaron went the run with Hawkeye and Black Widow in pursuit. Aaron considered the Avengers and A.I.M. the same as they both wanted his father's wand.
A mountaineer, Ab lived on Hollow Bluff with his wife Ella. The supernatural location drew the Legion of the Doomed, who forced the Waltins to take in one of their agents -- mystically disguised as a newborn human -- as their child as a cover for its serial murders. Fearful for their lives, Ab did his best to dissuade the curious, but was nevertheless murdered by the Legionnaires when the Fiery Mask uncovered the truth. His murder was reported in the newspaper following the Fiery Mask's showdown with the demons. Search this site for: Ab Waltin · Ab Waltin (Earth-616).