Hot expects Hey fans and action figure collectors, ensures "Mastering the Universe" for some surprises - both in positive and negative ways. In fact Roger Sweet describes in detail how he created He-Man and the toy series have cared for several years. In addition, it provides very interesting details to the emergence of special toys, insightful sales, patents and an extensive career on the rise and fall of Mattel's still successful action figure series. At the same time, however, turn out to be quite a few of Sweet's statements to be untrue or at least extremely doubtful. Some may well be due to the many years that lie between the book and the events it describes. Other, however, is contradicted by well-known details, especially Sweet can not provide evidence at the most important points and was not involved in some phases of the creative process. Moreover Roger Sweet provides numerous Ankedoten about his former working life, which is often but more like the settlement of a bitter ex-employee sounds when Sweet nothing good can at all which was not created under his leadership team. Thus, "Mastering the Universe" is primarily a written very subjective point of view work that interesting insights and information given, but by far can not solve any questions.