Skeletor is a fictional character and the primary antagonist of the Masters of the Universe franchise created by Mattel. He is the archenemy of He-Man. Depicted as a muscular blue humanoid with a purple hood over his yellow bare-bone skull, Skeletor seeks to conquer Castle Grayskull so he can obtain its ancient secrets, which would make him unstoppable and enable him to conquer and rule the fictional world of Eternia. However, the incompetence of his henchmen is always an impediment to achieving his ambitions.