Skeletor, Lord of Destruction, was (and remains) He-Man's arch enemy.
Once known as Keldor (but always evil), Skeletor's face was disfigured after a battle with his half-brother Randor. Skeletor's mission has always been to rule Eternia and unlock the secrets of the universe inside Castle Grayskull. To this end, Skeletor gathers a small band of evil renegades from Eternia and beyond to aid in his conquest of the planet. Thankfully, He-Man always seems to thwart his every move.
The original Skeletor featured the same "power-punch" action as He-Man, triggered when twisting and releasing the figure's waist. Skeletor's accessories included the Havoc (or Ram) staff, a removable harness and belt, and the other half of the fabled Power Sword.(Skeletor's half of the Power Sword is purple, while He-Man's is gray.)
The figure also came packaged with a mini-comic featuring Skeletor.
*Collector's Note A: Skeletor's first appearance in mainstream comic books is DC COMICS PRESENTS #47 published in July 1982.