He-Man's main rival. Skeletor had glowing yellow skull covered by a purple hood and blue muscled skin. He made his home on Snake Mountain. He always carried around his staff with a ram's head on top. Skeletor's agenda was to unlock the secrets of Catle Greyskull, and he did this through a series of more and more ridiculous plans. One involved stealing all of Eternia's books. He always followed up the explanation of his plans with a cackle.

Skeletor's main henchman (whom he always yelled at) were BeastMan, MerMan, and Evil Lyn.