This Masters of the Universe t-shirt features an image of the most powerful man in the universe, He-Man. From the powers of Castle Grayskull, Prince Adam is transformed into the mighty He-Man when he lifts his magic sword and says "by the power of Grayskull, I have the power". As He-Man, he battles the evil Skeletor to protect Eternia and the secrets of Castle Grayskull.