“If you’re not happy, you’re nothing at all.” In this new television adaptation of Aldous Huxley’s 1932 dystopian novel, Brave New World, a seemingly perfect society is challenged and begins to unravel. Starring Alden Ehrenreich, Jessica Brown Findlay, Hannah John-Kamen, Harry Lloyd, and Demi Moore, the series premiered on the new Peacock streaming service on July 15.