Ep 4. The End

In Supernatural season 5 episode 4, titled "The End," Dean is transported to a future in 2014 that has been ravaged by the Croatoan virus. In this future world, Dean discovers that Lucifer has taken Sam as his vessel and that the rest of humanity has been wiped out, leaving behind only vicious, infected humans known as Croats.

As he navigates this apocalyptic world, Dean reunites with a group of survivors led by Chuck, the prophet who has been publishing books about the Winchester brothers' adventures. However, Dean soon learns that his future self, known as "End!Dean," has been leading a ruthless resistance movement that is willing to sacrifice anyone and anything to defeat the Croats and the demonic forces behind the apocalypse.

As End!Dean and his army battle the Croats and Lucifer, Dean becomes increasingly conflicted about his role in this bleak future and the choices that led him down this path. He is forced to confront his own flaws and fears as he tries to find a way to prevent this nightmare from becoming a reality.

Meanwhile, back in the present day, Sam and Castiel work to find a way to rescue Dean from this dark future. They enlist the help of a time-traveling ally and try to locate a key that will allow them to breach the barrier between worlds and retrieve Dean. But as the deadline approaches, they begin to realize that their mission may be more perilous than they ever imagined.

"The End" is a tense, thrilling episode that explores the consequences of the choices we make and the power of free will in the face of impossible odds. It features strong performances from Jensen Ackles as both Dean and End!Dean, as well as Jared Padalecki and Misha Collins as Sam and Castiel, respectively. The episode is also notable for its impressive visual effects and visceral action scenes, as well as its poignant exploration of the bond between the Winchester brothers.

Overall, "The End" is a standout episode of Supernatural that offers a haunting glimpse into a possible future for the Winchesters and raises important questions about fate, destiny, and the nature of heroism.