He-Man ("The Most Powerful Man in the Universe") is a heroic fictional character in a toy series called Masters of the Universe ("MOTU") and the various spin-off products and media related to it. The most prominent is the animated series He-Man and the Masters of the Universe, produced by Filmation Studios. The syndicated series premiered in 1983 and ran until 1985, for a run of 130 episodes. In the series, He-Man and his friends defend Eternia and the secrets of Castle Grayskull from the evil forces of Skeletor.