Ep 11. Mystery Spot

In this episode of Supernatural, season 3 episode 11, titled "Mystery Spot", Sam and Dean investigate a mysterious case centered around a seemingly endless loop of time. The episode follows the brothers as they arrive in a small town in which strange phenomena have been occurring - a young man has been experiencing the same day over and over again, with the same events and occurrences repeating themselves, without explanation.

As Sam and Dean try to help the young man break out of this time loop, they soon find themselves caught up in the same phenomenon, experiencing their own never-ending day. The episode takes a unique twist on the traditional format of the show, as each time the day is reset, the situation becomes more and more dire - with a different event leading to Dean's death each time.

Throughout the episode, we see the frustration and desperation in Sam's character as he tries to save his brother from these repeated deaths. As time goes on and the day keeps resetting, Sam begins to unravel, struggling with the realization that there may be no way to save Dean.

As the day repeats itself over and over again, we get to see some of the more comedic sides of the show. There's a montage of Sam attempting to change the course of events, each attempt leading to yet another one of Dean's deaths, and culminating in an amusing sequence where a trickster who has been causing the time loop reveals himself to Sam.

The episode takes on a more melancholic tone as it concludes, with Sam coming to the realization that there is no solution to the never-ending day. It's a quiet and subtle ending, with Sam sitting alone in a diner as the day resets yet again and Dean comes back to life.

Overall, "Mystery Spot" is a standout episode in Supernatural's third season for its originality and fun take on the traditional format of the show. It also introduces a new and intriguing character, the trickster, who has a central role in a number of other episodes in the series.