An incredibly popular children's show during the 1980s, He-Man and the Masters of the Universe is an American animated television series produced by Filmation and based on Mattel's toy line. The show, often referred to as He-Man, has retained a heavy cult following to this day. It takes place on the fictional planet of Eternia where the lead character, Prince Adam, uses the Power Sword. Using the famous line, "By the Power of Grayskull, I have the Power!" Prince Adam is transformed into He-Man, the most powerful man in the universe.