: Unable to defeat the demon with Ruby’s knife, Sam falls back on his controversial psychic powers to exorcise Samhain, a decision that visibly strains him and angers both Dean and the angels.
: The angels reveal that the summoning of Samhain is one of the 66 Seals that will free Lucifer. To prevent it, they offer a cold solution: smiting the entire town, killing everyone in it. The brothers must race to stop the witch, Tracy Davis, before the angels "purify" the area. A Test of Faith [S4E7] It's the Great Pumpkin, Sam Winchester
Set just days before October 31st, the story begins with a series of gruesome, ritualistic deaths—starting with a man swallowing razor blades hidden in Halloween candy and a student drowning in boiling water while bobbing for apples. These aren't just random acts of violence; Sam and Dean discover they are blood sacrifices intended to summon , an ancient demon and the Celtic origin of Halloween. The Arrival of the Angels : Unable to defeat the demon with Ruby’s
This episode marks a significant turning point in the series' mythology: The brothers must race to stop the witch,
: This is the first time Sam Winchester comes face-to-face with the angel Castiel.