"The series follows the brothers Sam and Dean Winchester, played by Jared Padalecki and Jensen Ackles, who travel across the country in a black 1967 Chevy Impala investigating and combating paranormal events and other unexplained occurrences, many of them based on folklore, myths, and American urban legends, as well as classic supernatural creatures such as vampires, werewolves, and ghosts. Eric Kripke, the series' creator, cites Neil Gaiman's The Sandman and American Gods as influences on Supernatural, along with American Werewolf in London and Joseph Campbell's The Hero's Journey. The plot of the series has evolved over time, beginning initially with the Winchester brothers, 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 23 years ago. When Azazel killed Mary Winchester, he also infected the infant Sam with demon blood, which allow Sam to manifest powerful psychic gifts as an adult. Azazel is killed in the season finale, but not until after his 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 the third season, 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 is killed and sent to Hell. Season Four begins with Dean awakening dazed and confused in a grave, having been rescued by an angel named Castiel on orders from God. Sam on the other hand, has further developed his abilities with the help of Ruby during the months that Dean has been dead. It is soon revealed that Dean was revived to help stop Lilith's plan of breaking the 66 seals, which would let Lucifer walk free once again." Link: Supernatural (TV series) - Wikipedia, the free encyclopedia I have watched this show from the start when it began airing on ITV and then managed to watch the episodes that came out earlier on ITV2. I love how the show has evolved from it's simple monster of the week formula to it's all encompassing story arcs. Sure they sometimes go back to the monster of the week format but that's to it's credit as these episodes usally build on the characters themselves and/or include the main plot for the season. There is also alot of humour to be found in the series and they give alot of fan service too. Right now the series is mainly dealing with heaven vs hell and humans seemingly caught in the middle and it toys with the idea in interesting ways (angels who begin defecting, demons helping Sam and Dean etc).