Throughout the years, the character has been featured in several moderate-to-short-lived eponymous series, and has been a member of several different versions of DC's flagship superhero team, the Justice League. In all incarnations, the character initially served for the military. In the Charlton Comics continuity, he was a scientist named Allen Adam and gained his abilities by accident when he was seemingly "atomized" and then his body reformed, now existing as an atomic-powered being. In both DC Comics incarnations, he is an Air Force pilot named Nathaniel Adam, who was a test subject in a scientific experiment who seemingly disintegrated in the process, only to reappear later as the super-powered Captain Atom. Over the years, DC has attempted to reinvent the character several times. For a period, the character assumed the mantle of the supervillain Monarch, and in 2005 DC attempted to retell the Captain Atom story with an entirely new character, Breach, who was subsequently discarded. In the new continuity following DC's 2011 relaunch, Captain Atom has never been a member of the Justice League and the team views him with distrust; his character origin and abilities were also revised.