Why is horror in film and literature so popular? Why do viewers and readers enjoy feeling fearful? Experts in the fields of sociobiology and evolutionary psychology posit that behaviors from our ancestors that favored survival and adaptation still influence our actions, decisions and thoughts today. The author, with input from a new generation of Darwinists, explores six primal narratives that recur in the horror genre. They are territoriality, tribalism, fear of genetic assimilation, mating rituals, fear of the predator, and distrust or fear of the Other.