Skeletor || He-man

Skeletor is usually depicted as an evil skull-faced, blue-skinned sorcerer who serves as the archenemy of He-Man. In the storyline of the franchise, Skeletor is determined to discover the secrets of Castle Grayskull, which he believes will allow him to conquer the planet Eternia and become the titular Master of the Universe.

Skeletor is a former pupil of Hordak, a high-ranking commander of the Evil Horde. When Hordak invaded Eternia and kidnapped one of the King and Queen's twin babies from the palace, Man-At-Arms and the Royal Guard captured his apprentice, Skeletor, and forced him to divulge the whereabouts of his master, who had retreated to his base of operations, Snake Mountain. When cornered, Hordak opened a random dimensional portal (later revealed to have led to Etheria) and leaped through with the baby Princess Adora in his possession. Skeletor remained on Eternia, raised an army of powerful minions of his own and took over as ruler of Snake Mountain. Skeletor's main goal is to conquer the mysterious fortress of Castle Grayskull, from which He-Man draws his powers. If he succeeds, Skeletor would be able to conquer not only Eternia, but the whole universe. At the same time, his other goal is to take revenge on Hordak and overthrow Horde Prime in his bid to conquer the universe.

Skeletor is in fact Keldor, King Randor's long-lost brother. King Randor announces that Keldor disappeared years ago. "He thought to master magic; when his experiments went wrong and he was lost in a dimension beyond time!" One of the few elements of Skeletor's back story that remains consistent throughout the various continuities is that he had come to Eternia from another dimension. It is likely that Randor's statement about Keldor disappearing to another dimension is an attempt to reconcile Skeletor being He-Man's uncle with his Extra-Eternian origins. To find out what happened to Keldor, Randor and the Sorceress attempt to peer through a space-time rift that opens once every year. Randor announces "I think I see Keldor... Or is it..." Before he can see anything else, Skeletor appears, determined to stop them from finding out any more. Although Skeletor is defeated, he is able to prevent Randor from discovering Keldor's fate as the rift once again closes for another year. Skeletor's frantic effort to cover up what happened to Keldor, combined with the fact that Keldor vanished to another dimension when attempting to become a master sorcerer, is taken as a heavy implication that the two characters are indeed one and the same. Keldor's mother was a member of the Gar race and he was ousted from the royal castle due to his Gar heritage. He roamed Eternia for knowledge, eventually learning the Dark Arts from Hordak. He then sought to unite Eternia by ruling it himself and battle his own half-brother with his army of fellow misfits. After losing the battle and desperate to survive, he turned to his mentor Hordak who merged Keldor with an entity known as the Demo-Man. Together they formed Skeletor. Keldor agreed to pay whatever price Hordak wished for his own life, and Hordak transformed him, stripping the damaged tissues from his skull and dubbing him Skeletor; Keldor's head had been completely stripped of soft tissues, leaving only a floating skull.

As Kronis (who later became Trap Jaw) called for a retreat, Evil-Lyn took Keldor to Hordak's sanctuary, where Keldor summoned Hordak to save his life. Keldor agreed to pay whatever price Hordak wished for his own life, and Hordak transformed him, stripping the damaged tissues from his skull and dubbing him Skeletor; Keldor's head had been completely stripped of soft tissues, leaving only a floating skull. When Keldor saw his new appearance, he laughed maniacally about it; the incident possibly shattering whatever sanity he had left. Hordak can also apparently speak to Skeletor from Despondos through telepathy which also causes Skeletor great pain.