Byrne eventually intended to reveal that the team's arch-enemy, Umbra, was actually Caroline Carson, the wife of Robert Carson (Doc Danger) who had mysteriously perished and been somehow resurrected and transformed before the team was formed.
Four promotional pages published as the series premiered showed a battle between the original team (presumably circa 1970, as Doc Danger was still recognizably human but his cranium had visibly expanded in both height and girth) and Xlerii aboard one of their spaceships.