He-Man is a superhero and the protagonist of the sword and planet Masters of the Universe franchise, which includes a toy line, several animated television series, comic books, and a feature film. 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 archenemy Skeletor. He-Man is also the twin brother of She-Ra.