Masters of the Universe (or MOTU) is a sword and sorcery-themed media franchise created by Mattel in 1981. The main premise revolves around the conflict between He-Man (the alter ego of Prince Adam) against Skeletor on the planet Eternia, with a vast lineup of supporting characters in a hybrid setting of medieval sword and sorcery and sci-fi technology.
However, the Masters of the Universe franchise would become best known through Filmation’s groundbreaking He-Man and the Masters of the Universe animated series. Debuting in the fall of 1983, the Filmation series ran 130 episodes over two seasons until November 1985.
Since its initial launch, the franchise has spawned a variety of products, including multiple lines of action figures, six animated television series, several comic series, video games, books and magazines, a daily newspaper comic strip, and two feature films.