Skeletor (/ˈskɛlətɔːr/) is a supervillain and the main antagonist of the Masters of the Universe franchise created by Mattel, serving as the archenemy of He-Man and usually depicted as a skull-faced, blue-skinned sorcerer. In the franchise's storyline, Skeletor seeks to discover the secrets of Castle Grayskull, which he believes will allow him to conquer the planet of Eternia and the universe, and become the titular Master of the Universe.