Additional Background
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. This may explain why Doc Danger says as he readied himself to battle Umbra alone, "And, in the end, perhaps this was how it was always meant to be..." Umbra was never actually shown in any of the issues.
A previously unpublished page on John Byrne's website -- finished, colored and lettered -- shows two unidentified characters sneaking through a top security Xlerii holding facility to find the corpse of Calvin Carson in a morgue-like drawer after finding out that Captain Brewster had previously inspected the drawer.
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.
Nazi supervillain Golgotha was a recurring adversary of the team, although he appeared only in one flashback. He appears to be a cyborg with a mechanical left arm and his head is a bare skull underneath a transparent dome, possibly a nod to Captain America nemesis, the Red Skull, with additional inspiration from Spider-Man foe Mysterio. He is mentioned in John Byrne's timeline of that universe as being fought and killed after World War II. He was resurrected in 1965, battled Danger Unlimited thereafter and later killed in battle by Calvin Carson after murdering Calvin's wife.
Ultroid is another villain mentioned in the timeline but not revealed within the series.
Read more about this topic: Danger Unlimited
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