He-Man is a fictional character and the main protagonist of the animated television series "He-Man and the Masters of the Universe," which first aired in 1983. He is known for his superhuman strength and bravery, often fighting to protect the realm of Eternia from the evil sorcerer Skeletor and his minions. He-Man transforms from Prince Adam into his heroic form by raising his sword and proclaiming, "By the power of Grayskull!" The character is part of a larger franchise that includes toys, comics, and movies. He-Man is often accompanied by allies such as Teela, Man-At-Arms, and Orko, who assist him in his battles. The series emphasizes themes of good versus evil and the importance of friendship and courage.