Seven demons, based on the Seven Deadly Sins, are released into the world and the brothers must combat them with the aid of a married Hunter couple.

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A strange death reported in the newspaper prompts Dean and Sam to find Lisa Braeden, a woman Dean had a weekend fling with about 8.75 years ago, only to find she has a son turning 8. While investigating the death in the paper along with several other mysterious recent deaths, Sam and Dean find they are chasing a Changeling, who is replacing children with it's offspring. The mysterious blond woman is back, giving Sam a cryptic message.

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The Winchesters are called regarding a robbery of their father's storage unit, and track down the robbers to find the item stolen is a cursed rabbit's foot, which provides great luck until lost, and once lost the previous owner dies within a week. To complicate the whole situation, Gordon, from his prison home, has convinced two other hunters that Sam is pure evil and must be killed.

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A young girl trapped in a coma by her wicked stepmother sets off a series of murders based on the fairy tales her father reads her. Meanwhile, Sam tries to get Dean out of his deal.

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The seemingly harmless practices of a group of neighborhood witches goes bad when one of them kills a woman. Ruby offers her assistance... but she has a few secrets of her own.

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Sam relives the same day over and over, continually having to deal with Dean's death.

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Sam and Dean are arrested by Agent Henriksen and thrown into a jail cell in Colorado just as an army of demons makes their first move under a new leader who wants Sam dead.

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Sam and Dean discover a doctor who, back in 1816, became obsessed with finding the secret of eternal life by taking people's vital organs. Meanwhile, Bobby finds Bela and Dean leaves Sam to confront her.

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Dean's time is up and he has to pay the Devil his due. When Lilith resurfaces in New Harmony, Indiana terrorizing a family to no end Sam, Dean, and Bobby steal Ruby's knife and confront the mother of all demons in a battle to the death.

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These are my thoughts on season 3 of Supernatural.