Lucifer is revered as the creator of demons, though no demons had been able to contact him in his isolation, other than Azazel. Lucifer would direct Azazel in the plans involving the [[Special Children]], and the plot to release him from [[Lucifer's Cage|his prison]]. Following Azazel's death, Ruby and Lilith took over his plan covertly. When Lucifer is freed, the demons serve him, with the exception of [[Crowley]]. After Lucifer's re-imprisonment,<ref name="five22">[[5.22 Swan Song]]</ref> Crowley declared himself King of Hell with the blessing of [[Ramiel]], a [[Prince of Hell]] and sibling of Azazel. [[Abaddon]], a [[Knight of Hell]] and one of the most powerful demons in existence eventually started a civil war with Crowley in order to take control for herself, but was killed by Dean Winchester with [[the First Blade]] before she could win the war.
After Crowley is betrayed by his demons and deposed as ruler by Lucifer, he agreed to help the Winchesters trap Lucifer in [[Apocalypse World]], in addition to agreeing to close the Gates of Hell forever, having grown tired being ruler and dealing with demons. Crowley was unable to make good on his promise, due to sacrificing himself to close the rift between universes to trap Lucifer. In Crowley's absence, at least one demon, [[Kipling]], attempted to fill the power vacuum left in Crowley's wake. His attempt to take over Hell, saw Kipling try and strike a deal with Sam Winchester, along the same lines as they had with Crowley. After Sam rejected Kipling's offer, and killed him, Sam would declare that, "There will be no new King of Hell. Not today. Not ever. And if anybody wants the job, you can come through me." A threat demons seemed to take to heart, as according to Nick the demons have kept track of where the Winchester family is at all times out of fear.
===Creatures and denizens===