season 7

In season 7 , the winchesters will find themselves in an increasingly sinister, changing lanscape , up against a new foe unlike anything they've  ever fought before. The Leviathans, the very first beasts created by God himself, but where then locked away in Purgatory for being too destructive. They'll find their old tricks, weapons and hiding places are all rendered useless. All they have is each other. And certaintly that , like the last of the cowboys outlaw, whatever they face, they're not going down without a fight.

Castiel being controled by Leviathan

As Castiel reveals himself as he new God on the last episode on season6 . He warns them not to interfere in his business. Dean decides they should bind Death and order Death to stop Castiel ,but the former angel is one step ahead of them , leaving Dean to face a very angry Death. Meanwhile Sam struggles to deal with the broken wall in his head.

Leviathan

Death is bind with a spell

Sam and Dean are once again on FBI's most wanted list when two Leviathans clone the brothers and go on killing spree. The subject of a nationwide manhunt , Sam and Dean need a drop off the grid so bobby sends to frank , a surveilance expert ,for help. Meanwhile ,Bobby continues to search for a way to kill the Leviathans or atleast slow them down.



In order to defeat the Leviathans ,Sam and Dean must locate three key items. Castiel helps with one but for the last objectc the Winchesters must face of their strongest opponents, an alpha Vampire and Crowley theking of hell. Meanwhile Bobby tries out a new ghost trick that ends up being really bad (After he have been killed by the Leviathan ).

Dean and Sam finally prepare for a battle with the Leviathans . The Winchesters must team up with Castiel , Meg and Kevin Tran the prophet of the lord to defeat the Leviathan. However the Leviathan leader(Dick) is one of the smartest enemies they've ever faced so it's a mind game to see who can keep the upper hand .Finally Dean killes the Leviathan ,and get blown away with the leviathans to purgatory.

Crowley(king of hell)

alpha Vamphire

season 6

The sixth season begins a year after the Sam jumped into a cage with Lucifer and Micheal.Dean lives a happy life with Lisa and Ben. Sam mysteriously returns to the world of the living and teams up with Dean. Before Sam joins Dean ,he has been working under Samuel Campbell in order to hunt and capture alpha monsters(first of its kind) alive. Castiel is barely helpful anymore because the civil war against the archangel in heaven .They discover that Samuel is following Crowley's orders in exchange for the return of his daughter. Crowley wants to use the alphas to locate Purgatory, in which there are a vast collection of monster souls that are dead and can be used for power.

Samuel Campbell

they also fond that Castiel brought back Sam without his soul and Dean implores the help of the horseman DEATH in order to retrieve it. dDeath puts a wall in Sam's mind so that he will not remember hell. The old Sam returns with no memory of the past years. it turns out Castiel made a deal with Crowley for each of them to receive half of the souls in Purgatory.

Sam in Hell (memories)

Dean doesn't like the idea and tries to stop the duo. To get the winchesters and Bobby to slow down , Castiel knocks down the mind barrier in Sam. Castiel berays Crowley, Crowley becomes alias with Raphael and perfoems the ritual to open the doors of purgatory. It fails because they had the ake dog's blood and Castiel appears full of power from having done the ritual himself.

Castiel with full power 

He obliterates Raphael and Crowley escapes. When the Winchesters try to talk to Castiel , he reveals that he is not an angel anymore, he has become the new God.
 

season 5

The fifth season revolves around the fight to stop Lucifer and save the world from the Apocalypse. Throughout the season, after Sam and Dean learn that Dean is the true vessel of the archangel Micheal. And Sam was Lucifer vessel. The brothers battle both angels and demons as they fight their destiny to become the vessel of both Micheal and Lucifer.

Lucifer

While Castiel helps them out and also searches earth for God. They were unable to defeat Lucifer, even with the Colt. After learning that god won't help, they collect the rings of the four horseman of the Apocalypse, which acts as the keys to Lucifer's cage. It is to put him back in the cell thanks to the info from the trickster who turn out to be youngest brother of Lucifer and Micheal the archangel Gabriel and hel from the Demon Crowley.

Four Horsemens rings

 They continue forward until the end. Castiel rebels against Heaven for Dean in this season. Even after Lucifer was able to possess his true vessel, Sam's love for his brother Dean allowed Sam to regain control of his body and seal himself ,Lucifer ,Micheal and Adam Miligan(John's other son after an affair)brother of Sam and Dean , into the Lucifer's Cage.

Archangel Gabriel (trickster)

Four Horsemens

Bobby Singer

Lucifers Cage

LUCIFER

Lucifer also kwon as The devil or satan, is a fallen archangel. He is the former ruler of Hell and the creater of demons seen by them as a father figure. As the second born archangel , he is the younger brother of Micheal and the older brother of Raphael and Gabriel. According to Gabriel ,he was God's favorite celestial, but when God asked for all angel to bow down to humanity, Lucifer refused. He waged a war against God but was banished to hell by Michael. All of the yellow eye demon's action were motivated with the goal of eventually releasing Lucifer. 

season 4

Dean Winchester is rescued from hell and brought back by a mysterious angle of lord named Castiel , one of severel angles who appears throughtout 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 will allow the fallen archangle Lucifer to walk the earth 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 demonic side by drinking demon blood.

Sam got druged with demon blood

Castiel

Sam drink demon blood

It is because he want to be strong enough to defeat Lilith. After tracking down and killing Lilith , Sam learns that her death is actually was the last seal and Ruby was deceving him all along. Dean arrives but it was too late to stop Sam , but kills Ruby as Lucifer's prison opens up beneath them.

 

season 3

Early on season 3 they have faced the magnificent seven (7 dangerous demon) who escaped from hell 

thruogh the gates of hell. on season 2 finale.They also introduced to a new character, a young women named  Ruby who uses a demon killing knife.

Ruby holding demon killing knife

Ruby is a demon that shows particular interest in Sam. At her urgings ,Sam discovers that all the killing that the yellow eye demon has some connection with him.Ruby won't discuss what it is she wants, but says that not all demons are the same or have the same motivations. She also says if Sam helps her she can save Dean. She also assisted Bobby in successfully rebuilding and restoring power of the colt. At the end Ruby tells Dean that most demons were once human, but they forget what it's like to be a human . For same reason she remembers, which is one of the reason that she helps the brothers. Dean and Sam came to know that Ruby was once human too, she sold her soul to a demon.  

Ruby kill one of the magnificient seven

 In the episode"bad day at black rock", they found that John(father) had a secret starage room at black rock.Dean and Sam find that an object from the room is missing and set out to find it. The boys track down the burglars and get to know that the missing object was a rabbit foot. The rabbit's foot brings the boys to a series of lucky events until it is stolen by Bela , a thief and merchant out to use the supernatural world as a paycheck, and Sam's luck turns really bad.

Sam and Dean got really lucky (Rabbit's foot)

 Described by Bobby Singer as pretty damn far from hunter , Bela is an attractive Englishwoman who acquires magical objects for wealthy clients. Bela claims that she will steal anything to anyone for the right price.Dean threatens to kill Bela numerous times, but she stll continuously tricks and pranks the winchesters brothers.

The rabbit's foot

Bela

Sam and Dean argue over whether using the newly rebuilt Colt will help give them the upper hand in breaking Dean's deal with the crossroads demon who revived Sam. At the end the episode sam takes the Colt and while Dean is asleep, visits the demon and threatens her . She tells Sam , however that killng her will not break the deal since her boss holds the contract. Sam shoots and kills the demon anyway, along with the women it was possessing.
Then Bela was able to steal the Colt from the brothers . The following episode the trickster came and made fun out of Sam and Dean . the trickster sent off with a massage told Sam stop trying to save Dean from dying.
Sam's replacement chosen to appa rently lead the army of demons was revealed to be named Lilith, a white eyed demon who has possessed a little girl.The brothers eventually learn that Lilith is the demon holding Dean's deal. The brothers along with Ruby track Lilith down and attempt to kill her . Lilith was unable to stop Sam due to his mysterious abilities , however Dean's contract expires and his soul is taken.

Lilith(white eye demon)

Dean died attacked by hellhound(demon dog)

season 2

At the beginning of season 2, the brothers and the father are rescued and taken to the hospital but due to his extended injuries caused by both the demon's torture and the car accident, dean was eventually dying. John(father) summons the yellow eye demon to make a deal and trades the colt(gun) and his own life to save dean's.

season 2 

Both Dean and Sam struggle to get over john's death while trying to continue their job. As they continue to hunt they came across many people that share the same story as Sam , a mother who mysteriously died in their nurseries when the children were 6 months old. And they discover recently that they have some sort of psychic power.

people with psychic power's

After severel months of hunting . Sam dissappears while ordering food at a dinner. He awakens in a ghost town with four other psychics who are still alive.In a dream the yellow eye demon revels to Sam he has brought all of them to the town to compete against one another and the winner (the only one left alive) would become the leader of the demon's army. Jake an army soldier who claims he was abducted from Afghanistan ,kills Ava by snapping her neck after taking her by surprise . Dean has been trying to locate his brother .Upon their arrival , Dean and Bobby watch in horror as Sam is stabbed inthe back by the other surviver ,Jake. Sam dies in Dean's arms.Eventually dean made his mind to deal with the demon at the crossroads, his soul for Sam's life.The demon agrees and brings sam back from the dead. However she tells Dean that she will only give him one more year to live and if he tries in any wat to prevent his death, Sam will drop dead on spot . When Dean returns, he finds his brother alive, well and unaware af all that has happened. Dean decides to not to tell his brother that Jake had kill him.

jake kill ava

sam died in dean arms

sam and the other psychics

Jake 

Then they discover that an elaborate gate was constructed by Samual colt to bar an entrance from hell. The tells Jake that he must open the gate and the colt is the key.The whole group arrives to stop jake . Jake was surprised to see Sam amd insists that he have already killed Sam. Jake gets the gate open but is shot to death by Sam.
 The demon returns and taunts Dean with the possibillity that the Sam that Daen has had resurrected , may not be one hundred percent pure Sam. he then attemptss to kill Dean . However john manages to find his way out from hell and save his son . Dean shoots and kills the yellow eye demon with the last remaining bullet in the colt.And john's soul departs ,no longer condemned to hell . Bonny and Ellen are able to close the gate . Then Sam asks dean why did jake insisted that he had killed him. Dean is forced to reveal the deal  he had made at  the crossroads and Sam ,who is upset over the sacrifice dean has made                                                                              

dean kill yellow eye demon

,promises to save him.