If you have only passing familiarity with The Twilight Zone — maybe only really knowing its iconic opening sequence — you might be forgiven for thinking that the classic television show centered on scary themes. In reality, however, while the show certainly had a dark atmosphere and included plenty of suspense, creepiness, and dread, it fell more into the genres of science fiction and fantasy than horror. It was layered more with incisive insights into the dynamics of the individual mind and the group collective than outright frights. The monsters of the show lived in people’s heads; its chills were...