Well, since I finished Dark Angel's first season last night, I'm back to Babylon 5 today. I finished the fourth disc ('Hunter, Prey', 'There all the Honor Lies', 'And Now for a Word' and 'In the Shadow of Z'ha'dum') already, and have 'Knives' playin' now.
"In the Shadow of Z'ha'dum" is the episode that sealed my fate as a die-hard Babyloniac. JMS brought it to Marcon one year, and when I watched it I was already enjoying the show. This episode however, riveted me, in large part because we see Sheridan turn to the darker nature of his personality. The story of Coventry, even if off the mark a bit, was a very stark analogy that works well. And remember this exchange well:
Kosh: "If you go to Z'ha'dum, you will die."
Sheridan: "Then I die, but I will not go easily and I do not go down alone. You will teach me?"