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
He-Man this series maintained the double identity of Prince Adam and He-Man. On the planet Primus, Prince Adam posed as a traveling merchant and the nephew of Master Sebrian to disguise his secret identity. His transformation oath was altered slightly, to become "By the power of Eternia...". To tie in with a new line of action figures based upon the original toy line, a new He-Man cartoon series was produced in 2002-03 by Mike Young Productions again entitled "He-Man and the Masters of the Universe". This series retold the Masters of the Universe story from the beginning. He-Man's origin was told