When have TV aliens been more popular than magic? Do shows featuring time travel fare better than those about space exploration? We chart the popularity of television's most common themes, and see how scifi television has changed since 1970.
We looked at over 300 science fiction and fantasy television shows from 1970, the year after the original Star Trek series ended, to the present. In this chart, we list a few of the most iconic shows, but those are just a sampling of the hundreds we surveyed.