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Season four of Supernatural, an American television series, began airing on September 18, 2008. This is the third season to air on the CW television network. Season four regular cast members include Jared Padalecki and Jensen Ackles.

This season focuses on Sam and Dean continuing to hunt demons, the introduction of a mysterious angel, Castiel (Misha Collins), as well as Sam Winchester's new powers, and Dean's return from Hell and his memory of his time spent there. This season also touches on the brothers' continuing hunt for Lilith, who is trying to release Lucifer on the world.