Supernatural, the long-running CW series, started as a horror show but evolved into a serialized sci-fi/fantasy drama with recurring plot threads in nearly every episode towards its final season. However, there are still plenty of spooky and scary episodes to choose from in the early years of the show, with Season 4 being one of the best. The episode "Family Remains," written by showrunner Jeremy Carver, is considered one of the scariest in the series.
It features an inbred family of killers in a haunted house story that turns out to be anything but paranormal. The twist is unexpected and terrifying, making it a standout episode for fans of horror.