Who was the main villain in He-Man?

The main villain in He-Man is Skeletor. He is depicted as a powerful sorcerer with a skull-like face, constantly plotting to conquer the magical world of Eternia and defeat He-Man, the Champion of Eternia. Skeletor is known for his cunning, ambition, and a host of minions, making him a formidable adversary in the series. His iconic rivalry with He-Man is central to the show's storyline.