Sam tries to move on without his brother and becomes hardened and more reckless in the way he hunts. Bobby and his psychic friend Pamela try to contact the other side to find out more about Dean's ultimate fate.

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The Winchesters and Bobby Singer encounter the angry spirits of people they couldn't save.

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Castiel sends Dean back in time to 1973 where he encounters younger versions of his parents and for the first time meets his grandfather Samuel Campbell who holds a secret that sheds a light on the Winchester Family's connection to the hunter community.

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A hunter named Travis points Sam and Dean towards a meat eating creature called a Rugaru. Complicating matters is the fact that Travis's target is a normal suburban dad in the earlier process of changing and he hasn't killed anyone yet.

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It's Halloween time and the Winchesters face-off against a shapeshifter with a penchant for impersonating classic movie monsters like Dracula, the Wolfman, and the Mummy.

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Hell beckons again when Dean is stricken with a mysterious illness that frightens its sufferers to death. Sam and Dean scramble to find the cause of the disease in time to save Dean from sure death.

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Investigating two mysterious deaths in a small town, Sam and Dean discover a witch is sacrificing people to summon an ancient powerful and extremely dangerous demon.

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Sam and Dean investigate when a small town's wishing well actually starts to grant the people's wishes.

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Sam, Dean, and Ruby discover the existence of a female prophet named Anna Milton, who can hear the voices of angels and thus figures into the plans of a demon named Alastair who wants to use her as a tool against the angels.

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"I'll Kill her gentle." The angels want Anna dead, so Sam and Dean go on the run with the frightened girl, determined to discover the secret that has set the furies of Heaven on her.

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The Winchesters try to stop a family from moving into a haunted house.

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Sam and Dean investigate the activities of a trio of magicians who are using a grimoire to execute real feats of magic.

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Sam and Dean investigate a haunting at one of their old high schools where we will see what school was like for the brothers back in 1997.

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The Winchester's investigation into a series of deaths takes a deadly turn when a siren tries to tear them apart for good.

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Sam and Dean try to find out why people in a small town are having near death experiences with alarming frequency by going into the spirit world.

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Castiel and Uriel ask Dean to torture Alastair for information. But when Alastair breaks free, Castiel starts to believe that there is a traitor among the angels.

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At Sandover Bridge & Iron Inc., Dean is Dean Smith, the buttoned-down director of Sales & Marketing. Sam is Sam Wesson, a cubicle-dwelling tech support guy. What the heck is going on? Or is it what the Hell?

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An author has been writing books about Sam and Dean since 2005. Sam and Dean try to figure out how he knows so much about them.

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Meet the Winchester boys: Dean, Sam and... Adam. The Winchesters discover they have a younger half-brother, whose mother vanishes just as a long-dormant grave robber renews his ghoulish career.

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Castiel has been sent back to Heaven. His human host, Jimmy, tries to regain his life. But the demons won't leave him alone and now his family is at risk. Sam and Dean can help a little, but they're going to need a "miracle" to win.

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Dean and Bobby have something frightening locked in Bobby's panic room: Sam, contaminated by demon blood. But as the apocalypse draws nearer, Bobby wants to free Sam to battle on their side.

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The brothers prepare to fight the forces of the apocalypse in different camps. While Sam and Ruby hunt down Lilith, Dean joins Castiel and Zachariah to take on Lucifer.

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These are my thoughts on season 4 of Supernatural.