MASTERS OF THE UNIVERSE - ViewMaster 3 Reel Set 1980s fantasy action-adventure about the war-torn planet Eternia and the Castle of Greyskull which is coming under threat from the evil Skeletor 3 Reels with 21 - 3D Images from the TV Show Reels fit all View-Master viewers View-Master 3D products open up an exciting world of fun and adventure. You'll feel like you're there!