Supernatural: 10 Best Characters Who Only Appeared In One Episode

10. Jesse Turner - Season 5, Episode 6

Jesse Turner is a Cambion, a human-demon hybrid, introduced in the season five episode I Believe Children Are Our Future. He is the literal Antichrist, born of a virgin after being conceived by a demon. His mother contemplates killing him out of fear that he's evil but chooses to give him up for adoption instead.

Jesse comes to the attention of the Winchesters after he causes untold chaos all over his hometown. Turner is the most powerful being the Winchesters ever encountered. He is as strong as Lucifer. In fact, Michael is the only angel more powerful than the child. When Castiel tries to kill the boy, Turner transforms him into an action figure.

The Winchesters tell Jesse that he is a superhero and promise to train him. Turner undoes the damage he has caused and just vanishes. He is never seen again despite his immense potential as an antagonist. It is disturbing to think that in the Supernatural universe, there is an Antichrist just walking around somewhere.