As the demon and his minion Jackson are about to kill the hunters, Becky retrieves Ruby's Knife and kills Jackson with it, allowing the Winchesters to overpower the Crossroads Demon whose deals are revoked by Crowley who is bemused when she excitedly recognizes him. In an attempt to solve his family's murders and get revenge, Nick visits his old neighbor Arty who was a witness to a man running out of his house the night of the murders, but subsequently changed his story. When Charlie, Sam and Dean return to the bunker, they are greeted by Castiel, and Charlie is excited to meet him for the first time. "Two Minutes to Midnight" also introduces Death's taste for the typical, renowned, and often unhealthy local restaurant foods of the places he visits, which becomes something of a running gag. Shapeshifters are one of the most commonly appearing monsters in Unlike many monsters, shapeshifters are not hunger-based and instead retain human impulses and desires which they use their powers to act upon.

After the death of Asmodeus, the Princes of Hell were extinguished. Arthur sees Dean as the same as him and the two decide to take down a vampire nest together. The new Death, Billie, expresses sympathy towards her but refuses to bring back her son. Demonology, Fallen Angels, and the Philosophy of Good and EvilVirtually all religions & cultures have various supernatural entities that are considered malevolent or even evil.

During the celebrations, Sam thanks Rowena for keeping the rift open long enough for everyone to escape, and she admits that she could not have kept it open any longer. Overwhelmed, he later attacks the approaching hunters, forcing Sam to subdue him and lock Garth in the Impala's trunk. In "Back and to the Future," possessing the corpse of Lucifer's Nephilim son Jack, Belphegor presents himself as an ally to the Winchesters, explaining that in Hell he tortures souls and loves his job and as such, he wants to restore Hell back to normal. She is revealed to secretly be working for Lucifer who has promised Dagon a place at his side if she succeeds and is often in telepathic communication with the Fallen archangel. Michael is eventually defeated when Jack banishes him, but Jack begins to damage his soul as he taps into his powers after a confrontation with Lucifer, which results in him killing Mary by accident. In "The British Invasion", Kelly, uncomfortable with the situation, demands to see a doctor. Learning that they believe May to have been a Nephilim, Lily tells them the truth about what happened. People suffering from stress, fear or panic can be vulnerable to demonic possession. In the struggle, Dean tries to kill Crowley even though he is possessing Kevin's mother and in doing so, loses Kevin's trust. After Sam is locked in Lucifer's cage he keeps his promise to Sam arriving at Lisa's house. Dagon disappears with Kelly and reveals to the woman that the pregnancy will ultimately be fatal to her. The writers often try to base the demons off of actual aspects of history, as is done in "Malleus Maleficarum" by having the demon Tammi The writers originally intended for demons to not rely on human hosts, but rather exist "halfway between spirits and corporeal creatures".The appearance of demons' true forms have become more complex as the series has progressed. Though still a fan of Ben Braeden is the son of Lisa Braeden, a woman Dean once spent a weekend with in August 1999, portrayed by Nicholas Elia. He calls Ellen, Jo, and Bobby for help.

After Sam and Dean find him, he introduces them to the pack and tries to convince them that everything is fine, however, members of the pack worship Needing help to discover Michael's plans, Garth returns in "The Spear," offering to go undercover and infiltrate the rogue Archangel's ranks as a werewolf seeking an enhancement. Eileen took part in the mission to capture Kelly Kline and attempted to kill Dagon with the Colt. Jael is a sadistic Crossroads Demon appearing in Supernatural portrayed by Kara Royster, … He also shows sympathy for Lucifer, stating that Lucifer is not a villain.

"Executive producer and series writer Adam Glass revealed on Abraxas, portrayed by Nelson Leis, is a powerful and sadistic black-eyed demon appearing in Abraxas is briefly mentioned, though not by name, in In "Damaged Goods," Nick captures and tortures demons to death in search of Abraxas. However, Kaia and In "The Spear," Garth, having infiltrated Michael's organization, overhears Dark Kaia's location and passes it onto the Winchesters. However, they fail to reconcile their differences. As Sam and Castiel try to treat the traumatized Gabriel, Asmodeus uses his powers to seek him out, eventually locating Gabriel in the Winchester's bunker. Dagon shows up at the meeting and resists all attempts to kill her, including with the Colt.