Masters of the Universe (DVD)(1987)

Planet Eternia and the Castle of Greyskull are under threat from the evil Skeleton who wants to take over the planet. A group of freedom fighters, led by the heroic He-Man are accidentally transported to Earth by a mysterious Cosmic Key which holds the power to make Skeleton all-powerful. Once on Earth, He-Man joins alliances with two teenagers as they attempt to find the key and return home.