Often these crimes involved elements of the occult or science fiction, including 'fantastical' creatures.
The 'Kolchak' character originated in the novel, "The Kolchak Papers" by author Jeff Rice. In the novel, Las Vegas newspaper reporter Carl Kolchak tracks down and defeats a killer who turns out to be a vampire named 'Janos Skorzeny'.
During the series' run, "The Night Stalker" managed to tackle most of the major monster myths, including vampires, werewolves, mummies and zombies. It also included stories about a doppelganger, witches and succubus.
Also featured was a headless motorcycle rider and knight's suit of armor possessed by a supernatural spirit.
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The series also dealt with a killer android, invisible extra-terrestrial and a prehistoric man thawed back to life.