Supernatural is an American drama-horror television series starring Jared Padalecki as Sam Winchester and Jensen Ackles as Dean Winchester, brothers who hunt demons and other figures of the paranormal. The series, which is filmed in Vancouver, BC, Canada, debuted on September 13, 2005 on The WB, and is now part of The CW's lineup. The second season premiered on September 28, 2006, and the third on October 4, 2007, though its run was interrupted by the writers' strike. Supernatural returned for a fourth season on September 18, 2008. The series was renewed for a fifth season on February 24, 2009.

PLOT SUMMARY
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 and the killer of their beloved mother(Mary Winchester) and Sam's girlfriend's killer 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 allows Sam to manifest powerful psychic gifts as an adult. He also gave these gifts to other children on the night of their 6 month birthday (the same as Sam). Azazel is killed in the season finale, but not until after his plans are completed and a door to Hell (the 'Devil's Gate') 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.