: This is the first time Sam Winchester comes face-to-face with the angel Castiel.
: In the aftermath, Uriel threatens Sam with "obliteration" and cryptically suggests he ask Dean what really happened in Hell. Meanwhile, Castiel reveals to Dean that their orders were actually a test: they were commanded to do whatever Dean decided, testing his resolve under battlefield conditions. Did You Know? [S4E7] It's the Great Pumpkin, Sam Winchester
: 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 : This is the first time Sam Winchester