Angel – “Not Fade Away”
Okay, so four out of ten shows on this list are Joss Whedon shows, but none of them could be left off! The finale to Angel is pure awesomeness, though heartbreaking in that we lose Wesley, Lorne is forced to do something he would never want to do, and it looks like Gunn is going to become a vampire. The ultimate message of the episode is the battle against evil never ends, which is pretty appropriate considering the reality of the Buffy/Angel verse. Like Buffy, we get more of the story in the comics, but the TV show still has a really good ending.
[Credit: Flickr user RavenU]