-Blink (Doctor Who) perfect standalone episode, I don't even watch Doctor Who but I love this episode!
-The Gift (BtVS) perfection, should have been the series' finale
-The Constant (LOST) a beautiful, somewhat standalone episode, best that LOST has to offer
-The Other Woman (Mad Men) honestly, I could pick so many episodes from this show, but the way this episode delves into the mechanisms of the office and the way women are treated within it is both fantastically done and heart-breaking to watch
-Swan Song (SPN) similar to BtVS this should have been the series finale, a perfect episode which explores the themes of the show beautifully