A young man on Earth discovers a fabulous secret legacy as the prince of an alien planet, and must recover a magic sword and return home to protect his kingdom.

In furthest regions of space the kingdom of Eternia is threatened by the villainous Skeletor and his mischievous armies of darkness. To save his fathers kingdom and protect the lives of those he holds dear young Prince Adam has to retrieve a mythical sword and become the fabled warrior only known as "He-Man".