10 Terrible Supernatural Monsters That Never Returned

As a “Monster of the Week” series, Supernatural has pitted Sam and Dean Winchester up against a staggering variety of monsters, ghouls, and evil spirits, some of them being simply terrible at being paranormal threats. Much of the series focuses on the brothers getting tangled in the mythological battles of angels and demons, heavily serializing long-running arcs that have the brothers take on biblical threats. But the series will always have its roots as an episodic mystery thriller, Sam and Dean arriving at a new location and taking on a new threat every week.