Supernatural

The plot of the show has evolved over time, beginning initially with Sam and Dean looking for their father throughout most of Season One. Once they find him, the show becomes about killing Azazel, the yellow-eyed demon responsible for the death of their mother. This is accomplished, but not until after Azazel's plans are completed and a door to Hell is opened, although only momentarily, releasing a horde of demons into the world. This event also sees the death of Sam, who is subsequently resurrected by Dean selling his soul at the end of Season Two. In Season Three, the plot of the show focuses on trying to save Dean from his deal. Along the way, they meet a demon named Ruby, who has an interest in Sam and claims to be able to help save Dean, as well as Bela Talbot, an "acquirer" and seller of occult objects who is constantly a thorn in their side. The brothers eventually manage to track down the demon who holds Dean's contract, a powerhouse named Lilith who also wants Sam dead. However, Sam and Ruby ultimately fail to save Dean, who, as of the end of Season Three, is in Hell.