He-Man and the Masters of the Universe a "life lesson" or "moral of the story" at the end of each episode. This moral was usually directly tied to the action or central theme of that episode. The show was so successful that it spawned a spin-off series, "", following the adventures of He-Man's sister, Princess Adora. Mattel's subsequent attempts to relaunch the He-Man toy line also led to the short-lived sequel series "The New Adventures of He-Man" in the early 1990s, and an update of the series for a contemporary audience in 2002. It is also noted for featuring early script-writing work from J. Michael Straczynski, later
The New Adventures of He-Man Masters of the Universe continuity, as the whole franchise would be rebooted twelve years later. He-Man, legendary defender of the planet Eternia, has been summoned to the futuristic planet of Primus to defend the planet from the evil Mutants of the neighboring planet of Denebria. But his old adversary Skeletor has followed him and allied himself 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 from the continuous attacks by Skeletor and the Mutants. The majority of the cartoon episodes were