Supernatural is an American supernatural drama television series with humorous elements created by Eric Kripke, which debuted on September 13, 2005 on The WB, and is now part of The CW's lineup. Starring Jared Padalecki as Sam Winchester and Jensen Ackles as Dean Winchester, the series follows the brothers as they hunt demons and other figures of the supernatural. The series is produced by Warner Bros. Television, in association with Wonderland Sound and Vision. The current executive producers are Eric Kripke, McG, and Robert Singer; former executive producer Kim Manners died of lung cancer during production of the fourth season.

Season 1: 2006

After their mother's death in a suspicious fire that burns down their house, Dean and Sam Winchester live a life on the road with their father as they grow up. Years pass and the boys team up to find their father, John, who goes missing on a hunting trip. However, their father is not a typical hunter: he hunts supernatural creatures like ghosts, vampires, and spirits and he's trained his sons to do the same. Along the way, Sam and Dean save innocent people, fight creatures and ghosts, and collect clues to their father's whereabouts. Sam begins to mysteriously develop psychic abilities and visions as they travel. They eventually find and reunite with their father, who reveals that the creature that killed Sam and Dean's mother years earlier is Yellow-eyes and the only thing that can kill him is a legendary gun created by Samuel Colt. The season ends with the brothers and their father involved in a car crash when a truck hits the side of the Impala. They lay inside the car, covered in blood and unconscious.

Season 2: 2006-2007

this demon, who also caused the fire that led to the deaths of their mother and later, Sam's girlfriend, Jessica. They have assistance from new allies Ellen, Jo, and Ash. Part of Yellow-Eyes's master plan is eventually revealed as he gathers Sam and others like him to fight each other, leading to Sam dying. Dean makes a deal with the crossroads demon to bring back Sam in exchange for his soul, which will be collected in one year and taken to Hell. Yellow-Eyes opens a portal to Hell and as hundreds of demons and souls escape, has a final confrontation with the Winchesters. With the help of the spirit of John Winchester who escaped Hell through the portal, Dean finally kills Yellow-Eyes and the portal is closed, but the Winchesters and their allies are left to deal with the demon army that has been unleashed and the one year contract Dean has before he goes to Hell.

Season 3: 2007-2008

The season mainly focuses on trying to save Dean from his deal and tracking down the fury that was released from the gate. Along the way, the brothers meet Ruby, a 'good' demon, who has an interest in Sam and claims to be able to help save Dean. Also, they meet Bela Talbot, an "acquirer" and seller of occult objects, who is constantly a thorn in their side. The brothers eventually learn from Bela which demon holds Dean's contract: one being of great power named Lilith. Lilith takes Bela's soul after her contract expires but not before she has warned Sam and Dean. The brothers, along with Ruby, track her down and attempt to kill her. Lilith is unable to stop Sam due to his mysterious abilities; however, Dean's contract expires and his soul is taken to Hell.

Season 4: 2008-2009

Dean is rescued from Hell and brought back by an angel named Castiel, one of several angels who appears throughout the season. The rest of the season follows the brothers as they work with Castiel to stop Lilith's plan of breaking the 66 seals, which would allow Lucifer to walk free once again. Sam and Dean's relationship is also strained as Sam starts siding with Ruby over Dean. He also begins to give into his demonic side by drinking demon blood to become strong enough to defeat Lilith. He and Dean eventually have a falling out and Sam sides fully with Ruby in his obsessive quest to kill Lilith. Dean makes a deal with the angels to save Sam and learns that they want the Apocalypse to come in order to rebuild Earth as a Paradise. With aid from Castiel, Dean escapes and tries to stop Sam as he has learned that Lilith is in fact the last seal, but Sam kills her anyway, breaking open Lucifer's prison. Ruby reveals her true colors as a demon loyal to Lucifer and Dean kills her, but as the season ends, Lucifer's Cage opens and he starts to escape.

Season 5: 2010

The fifth season revolves around the fight to stop Lucifer and save the world from the Apocalypse. Throughout the season, Dean and Sam battle both angels and demons as they fight their destiny to become the vessels of Michael and Lucifer. Unable to defeat Lucifer, they collect the rings of the Four Horsemen of the Apocalypse, which act as the keys to Lucifer's prison. The idea of destiny versus freedom and choice plays a large role. Throughout the season, Dean, Sam, Castiel, and Bobby each have a crisis as they near giving up. However, through each other's support, they continue forward until the end. It is also notable that Dean and Castiel have an ongoing friendship during this season, while Dean and Sam initially grow further apart. In the end, after Sam allows Lucifer to posses him and he kills Bobby and Castiel, Sam manages to regain control thanks to his bond with Dean and throws himself, Lucifer, Michael and Adam Milligan into Hell to trap Lucifer once more. Castiel is resurrected more powerful than ever and returns to Heaven to restore order after resurrecting Bobby. Dean returns to his old girlfriend Lisa to live a normal life, but Sam is shown mysteriously free and watching his brother.

Season 6: 2010

The sixth season begins a year after the end happenings of the fifth with Dean living a somewhat happy life with Lisa and Ben. When a seemingly emotionless Sam returns to Dean, he is forced to leave his new life behind. Dean is forced to work with his grandfather Samuel to capture Alpha Monsters, they are unable to get help from Castiel due to a civil war in heaven, and cannot trust Samuel. Dean's suspicions are confirmed when he finds Samuel working with demons to activate the portal to Purgatory. Dean finds that Sam has no emotion due to having lost his soul after Crowley brought him back from Hell, so he implores the help of the Horseman Death in order to retrieve it. In order to ensure Sam does not remember Hell, Death wipes that part of Sam's memory using a wall. The brothers discover Castiel to be behind the events of Sam's return, the Alpha Monsters and the portal to Purgatory. When the brothers try to stop Castiel, he brings Sam's memory of Hell back and goes ahead with his plan, absorbs all the souls from Purgatory and pronounces himself God due to having had evolved beyond being an angel.

Season 7: 2011

After declaring himself God, Castiel goes forth to try and punish all the wrongdoers in the world, garnering attention. Very quickly though, however, he discovers that he had absorbed Leviathan as well who are breaking free. Sam and Dean manage to return the Purgatory souls but fail to return the Leviathans who seemingly kill Castiel before vanishing. The Leviathans inhabit the bodies of many different people around the world, with Sam and Dean learning their weakness Borax, though it has minimum effectiveness on the Leviathan leader, Dick Roman. After Roman kills Bobby, Dean becomes obsessed with taking the Leviathans down and learns of a facility they are making, only to learn it is a facility to cure cancer as one Leviathan puts it: "We're only here to help". The spirit of Bobby later confirms that while they are curing disease, they are doing it as part of their grand plan to turn humanity into the perfect food source.

Season ends with Dean killing Dick Roman after which Dick explodes and Dean with Castiel appear in Purgatory surrounded by 'monster souls'.