Mastering the Universe illuminates the creation, rise, and fall of one of the top-selling product lines in what is arguably the world s most competitive industry, toys and it does so from the perspective of Roger Sweet, the man who originated He-Man for Mattel. He-Man and the product line that grew out of it, Masters of the Universe (MOTU), created a fantasy world for boys that, at its height in 1986, reached $400 million in U.S. sales, only to plummet to $7 million the following year. During its six-year run, the MOTU line sold $1.2 billion worldwide and spawned a syndicated cartoon series and a major motion picture a feat not even the venerable Barbie can claim. Mastering the Universe explores the phenomenon of He-Man s popularity, as well as the shocking reasons behind the toy s rapid decline.