Book excerpt: Can science fiction--especially sci-fi cinema--save the world? It already has, many times. Retired officers testify that films like Doctor Strangelove, Fail-Safe, On the Beach and War Games provoked changes and helped prevent accidental war. Soylent Green and Silent Running recruited millions of environmental activists. The China Syndrome and countless movies about plagues helped bring attention to those failure modes. And the grand-daddy of "self-preventing prophecy"--Nineteen Eighty-Four--girded countless citizens to stay wary of Big Brother. It's not been all dire warnings. While optimism is much harder to dramatize than apocalypse, both large and small screens have also encouraged millions to lift their gaze, contemplating how we might get better, incrementally, or else raise grandchildren worthy of the stars. Come along on a quirky quest for unusual insights into the power of forward-looking media. How the romantic allure of feudalism tugs at men and women who benefited vastly from modernity. Or explore why almost every Hollywood film preaches Suspicion of Authority, along with tolerance, diversity and personal eccentricity, and how those messages helped keep us free. No one is spared scrutiny! Not Spielberg or Tolkien or Cameron or Costner... nor Dune or demigods or zombie flicks. Certainly not George Lucas or Ayn Rand! Though some critiques are offered from a lifetime of respect and love... and gratitude.