Ah, He-Man... larger than life hero of my infant years.
Yeah it all feels real campy now, but it's hard to dislike this old show, one of the most fondly remembered of the 80s era.
Prince Adam and He-Man looked exactly the same, just like Clark Kent/Superman, and no one ever caught on. Prince Adam's wardrobe could have used some work, but hey, it was aimed at little kids. In today's increasingly cynical era in which finding kid friendly shows is getting ever harder to do, parents should rest assured that this one is user friendly and shouldn't leave their children too badly scarred. Too bad they don't try to work in more morality into shows anymore.
Remade twice so far and one live action feature film. The new He-Man actually looks kind of like Dolph Lundgren of the live action film, but with a much more wildly drawn physique. Also had a spin off known as "She-Ra: Princess of Power". Whether or not that will be remade I don't know.
I always thought "Thundercats" borrowed a lot from He-Man: big burly hero, magical sword, demonic villain, lots of hideous henchmen, and lots of science fictional elements blended with fantasy elements. The biggest difference, of course, was that He-Man was smarter than Lion-O, the lead character of "Thundercats" (not that that was completely his fault).