The Wheel of Infinity is an artifact that Skeletor once used in one of his plots. Once set in motion, the wheel would spin faster and faster and grow larger and larger until it exploded. Skeletor saw this as a perfect way to destroy Castle Grayskull, so he traveled thousands of years into Eternia's past and erected a fortress on the site where the castle would eventually be built. He-Man cornered Skeletor and fought him in the fortress, but deflected one of his shots into the Wheel of Infinity and set it in motion. He couldn't stop the wheel from spinning, so he decided to speed it up, spinning it rapidly and hurling it into outer space before it exploded.