He-Man sharing it only with Orko, Man-At-Arms, Cringer/Battle Cat and the Sorceress. The spin-off cartoon series "" later revealed that Adam had a twin sister: Princess Adora, a leader of the Great Rebellion against Hordak on the planet Etheria. Adora, like Adam, was given the gift of the power of Grayskull and had her own sword which she used to transform into She-Ra, Princess of Power. He-Man made a number of appearances in the "She-Ra: Princess of Power" television series. He-Man's archenemy was Skeletor, a blue-skinned sorcerer with a yellow skull for a head (concealed with a cowl). He was skilled
He-Man be a descendant of King Grayskull (a powerful barbarian and a hero from Eternia's ancient past), who sacrificed his life in order to save Eternia from the Evil Horde and originally wielded the Sword of Power. He was the original owner of Castle Grayskull; his sword was concealed in the castle for centuries before being given to Prince Adam, who inherited his ancestor's own power channeled through the sword (thus giving added meaning to the phrase "By the power of Grayskull..."). This action-figure line combined elements from the He-Man universe into a cohesive storyline with biographies on the figures' packaging.