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/ThunderCats shield it from attack when Jaga's spirit form arrives. Jaga tells the Sorceress that he believes there is a way to stop the Spirits but the answer lies on the Thundercat's destroyed home world of Thundara. The Sorceress opens a portal in space and time for Jaga and her to slip through and get the item they need. Outside, despite the hero's best efforts, the Spirits close in on Castle Grayskull. When Man-At-Arms, Tygra, and Panthro fire the cannon at one of the Spirit's head it simply laughs off the attempt and turns to attack the castle. Tygra then uses