Although the majority of the NCIS team is young, filled by Tony, Ziva, Abby, and McGee, there are a couple old farts with deep histories. "Enemies Domestic" brings everything full circle, largely ignoring the young characters, to tie up a bunch of loose threads, and makes for a very satisfying episode. showing how Vance was brought into NCIS, how he met Eli, and how he met Gibbs (on unfavorable terms, of course).
We see how Vance was brought into NCIS, his first mission in Amsterdam in which he crossed paths with Vance as they took out Russian hitmen, and with the revelation of Riley McAllister as the culprit, we also learn why Vance had a fake file. We get a brief flashback to Gibbs's time in Paris when they killed a Russian, and an explanation for the danish talk.
The younger characters stayed on the sidelines for most of the episode, but we did get an epic fight between Ziva and Liat which unfortunately ends in a draw when Eli intervenes. As far as Ziva and Eli go, they part on amicable terms as both acknowledge their duties and also that they share a special place in their hearts for each other.
Score: 9.0/10