The fate of the universe seems sealed. Skeletor, the ruler of evil, has conquered the planet Eternia and taken control of the powerful sorceress of Greyskull. To enforce his unrestricted rule, he only needs one thing: the cosmic key that can transport its owner to any point in the galaxy. But there is still hope: He-Man, the strongest warrior in Eternia, and his friends Teela and Gwildor, the resourceful dwarf, have declared war on Skeletor. On Earth, they fight the battle that will decide the fate of the universe.