Hollywood has always been interested in science--and has employed consultants to get it right throughout most of its history. It's a relationship, though, that has been controversial at times, and in this article we look at how technical advisors resolve the tension between accurate science and dramatic storytelling. As an investigator and science planning engineer at NASA's Jet Propulsion Laboratory in Pasadena, Calif., Kevin Grazier, Ph.D., spends a lot of time with his head in the stars. Most days, he's concerned with the Cassini/Huygens mission to Saturn and Titan. But every now and then he wrestles with the challenges of a more far-out world: "Battlestar Galactica"--a contemporary remake of the classic 1979 television show.