Hmm.

Now, I liked Vance from the get go (yes, I'm that elusive person you've heard rumors about! *g*) but I don't like him enough to enjoy a Vance-centric episode, so this is kinda difficult for me.

However, if I had to choose, I'd probably go with the "Enemies Foreign / Enemies Domestic" two-parter. The look into Vance's (and Eli's) past was fascinating, the acting (and make-up!) was brilliant, and it gave us great insight into the character. Not necessarily something I have to watch again every month, but I was very positively surprised by this two-parter.

As for moment, I have to pick the last scene of "Judgment Day, Part 2" when he matter-of-factly splits up the team. Hadn't seen that one coming, so it was a huge surprise, not to mention shock, and it was the perfect introduction to this character.