Why it's on the list: I've bent some rules, for this episode is stretching boundaries in the "standalone" department. Come season six, some rules need to be bent. Still, I kept going back and forth over whether I should this it on here. After all, it has a tie back Samuel Colt and his significance to the demon killing colt that's been a big part of the mytharc since the first season, there's the reference to the Elkins family, and all the information in the Campbell family library. Plus, this isn't Sam and Dean's first time travel trip via angel mojo, and even the side story is Castiel's part of the mytharc!
So why is it here? Because how could I possibly leave the Western off? It's iconic! The western story itself, which is hunting a phoenix in the form of a cowboy in 1861, works perfectly as a standalone. Who wouldn't enjoy Dean getting so excited about his trip to the old west that he has to go shopping, getting Sam a Roy Rogers style white shirt with yellow roses, himself a Clint Eastwood serape, and them both some not so period cowboy hats. Once Castiel sends them back to 1861 Wyoming, Dean learns the ultimate lesson, what he saw in the movies isn't the real old west. "Nice blanket." Hee! There's the eye opening trip to the saloon where the women have diseases and the whiskey tastes like gasoline, the ludicrous notion of Sam riding a horse and the smokin' hot Sheriff Dean in a full length waist coat and proper hat having his high noon showdown in the town square. Throw in the call back to Back To The Future II at the end and even if the viewer knows nothing about Supernatural they're very entertained.
Favorite Scene: So tough with this episode! I'll go with the final showdown at the town square, because that scene manages to get my hormones in a twist. Dean's outfit, his square jawed glare, both men with coats flipped ready for the draw, and Dean has an ace up his sleeve that his phoenix opponent doesn't know. Sam arrived with the colt in time. Of course all of this is complicated with Castiel and Bobby back at home trying to get enough power back into Castiel to bring the boys home. The timing is tight for sure and the back and forth is exciting. The phoenix goes down thanks to Dean's quick draw but, the ashes cannot be retrieved in time. Lucky for everyone, there's a Back to The Future II homage to play out. Samuel Colt did care after all.