He-Man and the Masters of the Universe powers to defend Eternia from the evil forces of Skeletor. Skeletor's main goal is to conquer the mysterious fortress of Castle Grayskull, from which He-Man draws his powers. If successful, Skeletor would have enough power to rule all of Eternia and possibly the entire universe. The Mattel company released the original He-Man action figure in 1982; the franchise backstory was developed by the Filmation animation studio. On 1 December 1982, Michael Halperin wrote a "series bible". Some time after, both firms pitched the idea to the ABC network, who turned it down. The resulting series, "He-Man and the Masters of
He-Man in a 90-minute series premiere, in which the 16-year-old Prince Adam was summoned to Castle Grayskull by the Sorceress to assume the identity of He-Man and his role as Eternia's defender. The portrayal of his character in this series was consistent with Filmation's portrayal, although the character of Prince Adam was brasher and more youthfully energetic than his 1980s counterpart (conveying the image of a teenage boy saddled with the responsibility of defending a planet from evil). The Adam/He-Man character was redesigned, to make the character's secret identity more credible. The third-season episode "The Power of Grayskull" revealed Adam/He-Man to