(The first three seasons are copied online, and the fourth season is a little more detailed, but they are all very probable, you can take a look at it)

Season 1

Sam and Dean are two brothers. Pen "Fun" Pavilion www.biquge.info 22 years ago, in their childhood, their mother was killed by a supernatural force, and their father started his wife's family business, embarking on a hunting journey, that is, a journey to hunt supernatural creatures that endanger humans. The father tracks down the whereabouts of the demon who killed his wife. While teaching the two brothers about hunting demons and supernatural creatures. However, Sam wanted to live a normal life, so the rift between him and his father grew, and he eventually ran away from home because of a heated argument and went to college alone. In college, Sam was a high-achieving student with excellent grades and had a beautiful girlfriend. The older brother, Dean, remained firmly with his father and continued to pursue him.

However, when his father goes missing during a tracking trip, Sam reluctantly joins his brother and dedicates a weekend to find his missing father. Sam, who had been perfunctory but had a terrible tragic event that completely changed his mind, gave up all thoughts of a happy life and threw himself wholeheartedly into this action.

Season 2

In the last season, the Winchester family, after a lot of hard work, finally found their father and the demon who killed their loved ones, and got a colt gun that could destroy it. But in the end, the devil's trick escaped, leaving only the badly injured Winchester family.

In the hospital, John did not hesitate to save Dean's life in exchange for his soul and a colt gun. Dean survived, but John was gone forever. In order to avenge their father, the two brothers set out on a demon hunt in a chevyimpala and continued to track down the demon's whereabouts......

Season 3

In the last season, although the yellow-eyed devil was destroyed, the gates of hell were opened, hundreds of demons poured into the world, darkness will envelop the world, and Sam and Dean of the Winchester family will face an unprecedented difficult mission. Destroy all the demons that escaped. At the same time, they have their own problems: Sam finally understands why he was chosen by the Yellow-Eyed Devil and what it did to him, he is the chosen child of the Devil, who has drunk the blood of the devil and is said to lead all the demon armies. And in order to save Sam, who was unfortunately killed during the battle between many children chosen by the devil. Dean and the Crossroads Devil make a pact to save Sam, but for a year Dean will be dragged to hell. When Sam learns about it, he tries to find a way to break the contract. On their way, they meet another demon, Ruby, who claims to be willing to help them, repairs Colt, and finds a dagger that can kill the demon. The Winchester brothers will face the problem of being surrounded by demons led by Lilith, Dean's own life contract, and even other witchers.

Season 4

Dean doesn't find a way to break his contract and ends up being dragged into hell. He was then rescued by the angel Casidio. All the truths are starting to emerge, everything is a conspiracy, and Dean is not dragged into hell by chance, but because he will be the first to open the seals - the good people begin to fall (I forget what it is), and open the path of the apocalypse, the way to resurrect Lucifer. There are hundreds of these seals scattered all over the world, and after the first seal is opened, the demons only need to open sixty-six of them to be able to open the cage where Lucifer is imprisoned in the deepest part of hell, and release the fallen archangel Lucifer to open the apocalypse. And Dean came out of hell for a reason, because the prophecy says that only the first person to open the seal has the power to end this. At the same time, when Dean falls into Hell, Sam finally realizes that he is the reason for his calling, because as long as he has drunk the blood of demons, he has a superpower that can expel demons from human bodies back to Hell, and even later develop to be able to kill demons directly. But he didn't find that the demon's blood was like a drug to him, and while he was with the demon's blood, he gradually became addicted to this blood, and finally couldn't extricate himself, and was discovered by Dean and the angel Casidio, at this time Cassidian was questioned by heaven because of too much contact with Sam and Dean, and was dragged back to heaven for brainwashing, and when he came, it was as if he had changed as a person. Dean locked Sam in a room prepared to prevent the demon from sneaking up, trying to get him off his addiction to the demon's blood, but at this time, the angel Cassidio appeared by surprise and secretly released Sam, it turned out that I don't know when it started, the upper echelons of the angel have decided to release Lucifer, and then kill him completely, to solve this grudge that has arisen thousands of years ago. And the key to unleashing Lucifer is on Sam, because the first demon will be the last seal, and the only thing that can kill Lilith is Sam's superpowers. In order to prevent Dean from obstructing the angels, he did not hesitate to imprison him, during which Dean continued to persuade Casidio, and finally reformed the angel, expelled his boss with a witchcraft enchantment, and took Dean to the human prophet Chuck to learn where Sam is now, at this time the archangel came, and the angel Casidio sent Dean to Sam alone, and he stayed to deal with the archangel, but when Dean arrived, it was too late, the seal had been broken, and Lucifer was resurrected.