Prince Adam is sent through a magic portal to deliver a strange jeweled sword to it's rightful owner on the planet Etheria. There he finds the inhabitants are enslaved by Hordak's evil Horde and gives his help to the Great Rebellion as He-Man. During combat he meets Force Captain Adora, an officer of the Horde, and the jeweled sword begins to glow. Adora soon learns her true identity -- she is Princess Adora, the long lost twin sister of Prince Adam and she possesses secret powers! Holding the sword aloft, she exclaims: "For the honor of Grayskull!" and in a spectacular explosion of mystic power, Adora becomes She-Ra, Princess of Power.The powerful siblings, now reunited, join forces to protect both of their worlds from the evil schemes of Hordak, Skeletor and the Horde.