Ep 20. The Rapture

In Supernatural season 4 episode 20, titled "The Rapture", Sam and Dean Winchester find themselves investigating a series of mysterious deaths in a small town. As they delve deeper into the case, they discover that the victims were all members of a religious group known as the "Disciples of Lucifer" and that the murders may have been the work of a rogue member of the group.

Meanwhile, Castiel, the angel who has been working with the Winchesters, is having an existential crisis. As an angel, Castiel has always believed that he has a clear purpose and that his actions are guided by a higher power. However, after witnessing the human experience through his interactions with Sam and Dean, Castiel begins to question his beliefs and his place in the world.

The episode also delves into the history of Castiel's character, exploring his experiences during the Great Fall, a moment in angelic history when many angels rebelled against God. Through a series of flashbacks, viewers are given a glimpse into the emotional and physical toll that the Great Fall took on Castiel and other angels.

Ultimately, "The Rapture" is a thought-provoking episode that challenges both the characters and the viewers to question their beliefs and to consider the implications of their actions. With its mix of action, drama, and theological pondering, it's a standout episode in the fourth season of Supernatural.