View-Master Experience Pack Masters of the Universe, designed to work with the View-Master VR viewer, will launch you into Eternia - the world of He-Man. Skeletor has seized Castle Grayskull and He-Man is being held captive at Snake Mountain. Work side-by-side with He-Man as he battles Skeletor and his minions in a series of skirmishes. Collect crystals, gain power, level-up heroes to improve their powers, and win battles. You are the only one who can help The Most Powerful Man in the Universe escape and reclaim Castle Grayskull.