Skullpocalypse

Skullpocalypse was a major villain in the Grognak the Barbarian comic-book series.

Appearances
Skullpocalypse is mentioned only in Fallout 3 and by Robert MacCready in Fallout 4.

Behind the scenes
Skullpocalypse could be a reference to the cartoon Masters of the Universe, where the main villain is called Skeletor.