He-Man & Skeletor battle for control of Castle Grayskull in this fan film based on the popular 80's cartoon/toy... Masters of the Universe! He-Man & Skeletor battle for control of Castle Grayskull in this fan film based on the popular 80's cartoon/toy... Masters of the Universe! He-Man & Skeletor battle for control of Castle Grayskull in this fan film based on the popular 80's cartoon/toy... Masters of the Universe! He-Man & Skeletor battle for control of Castle Grayskull in this fan film based on the popular 80's cartoon/toy... Masters of the Universe!