Fictional characters introduced in 1981

He-Man is a superhero and the protagonist of the sword and planet franchise Masters of the Universe, which includes a toy line, several animated television series, comic books, and two feature films. He-Man is characterized by his superhuman strength and in most variations, is the alter ego of Prince Adam. He-Man and his friends attempt to defend the secrets of Castle Grayskull, the planet Eternia, and the rest of the universe from the evil forces of his uncle and archenemy Skeletor. He-Man is also the twin brother of She-Ra.

Keldor, also known as Skeletor, () is a supervillain and the main antagonist of the Masters of the Universe franchise created by Mattel, serving as the archenemy of his nephew 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.