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Season 4 summary
Premiered September 18, 2008, and concluded on May 14, 2009.
Dean Winchester is rescued from Hell and brought back by a mysterious angel of the lord 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 the fallen archangel 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 his demonic side by drinking demon blood to become strong enough to defeat Lilith. After tracking down and killing Lilith, Sam learns her death is actually the last seal and Ruby was deceiving him all along. Dean arrives too late to stop him, but kills Ruby as Lucifer's prison opens up beneath them.
Premiered September 18, 2008, and concluded on May 14, 2009.
Dean Winchester is rescued from Hell and brought back by a mysterious angel of the lord 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 the fallen archangel 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 his demonic side by drinking demon blood to become strong enough to defeat Lilith. After tracking down and killing Lilith, Sam learns her death is actually the last seal and Ruby was deceiving him all along. Dean arrives too late to stop him, but kills Ruby as Lucifer's prison opens up beneath them.