He-Man, legendary defender of the planet Eternia, has been summoned 10,000 years into the future to the world of Primus to defend the planet from the evil Mutants of Denebria. But Skeletor, has followed him, and allied with the Mutants in his fight to conquer the whole universe. Together with a team of Galactic Guardians, He-Man fights to defend Primus and all its power resources.