In 1970, the gap between shows featuring magic and shows featuring more science-based themes is fairly wide, which may be related to the relative cost of producing the different types of shows; Captain Kirk required pricey sets and a makeup crew while Samantha Stevens just needed a film editor and the ability to wiggle her nose. But as audience expectations for shows involving magic become analogous to their expectations for science fiction shows, magic’s peaks and valleys start to correspond to those of other themes, though supernatural shows may be a bit more resilient to overall drops in television spending. —i09.com