with the original He-Man action figure. Skeletor's goal in the book is to acquire the other half of the sword hidden inside Castle Grayskull in order to obtain the sword's total power, adding that "the magic fires, created by ancient scientists and sorcerers, will blaze again" once the two halves are joined. The specific purpose of the quest is also made clear: the Power Sword can be used to open a hole in the dimensional wall in order to bring reinforcements from Skeletor's dimension of origin, which would allow Skeletor to conquer Eternia's dimension. Once the two halves of the Power Sword are joined, Skeletor is able to use the sword to command various objects to attack He-Man. However, the spell is broken once the Sorceress splits the Power Sword into two halves again, hiding them and making the Power Sword the only key that can open the castle's Jaw-Bridge when inserted into an enchanted lock. The next illustrated book, King of Castle Grayskull, reveals where the two halves have been hidden: one at Eternia's "highest point", the other beneath its "hardest rock." Whoever finds them can claim the throne of Castle Grayskull and the "secrets of the universe". The "highest point" turns out to be the top of Stratos's mountain, while the "hardest rock" is the rock where He-Man built his home in the previous book. As expected, the Jawbridge opens once the two halves have been inserted into the lock, but then Skeletor loses the sword again in battle. The book ends with the Spirit of the Castle sending the two halves into another dimension, where Skeletor is not expected to find them easily. The Power Sword is not featured in the last two books of the first series, Battle in the Clouds and The Vengeance of Skeletor. In How He-Man Mastered the Universe: Toy to Television to the Big Screen, Brian C. Baer writes: Filmation cartoon When Filmation produced the cartoon He-Man and the Masters of the Universe in 1983, the producers worried that children wouldn't identify with a wild, axe-wielding barbarian character. Based on their experience with The Kid Super Power Hour with Shazam! in 1981, Filmation knew that kids would relate to a vulnerable, child-like figure who could turn super-powerful with a prop and a magic word. For He-Man, the protagonist became Prince Adam, who could use a newly-restored Power Sword to turn into the