Wow... what a great Star Trek season! So hard to chose...
I'll have to go with 'Trials and Tribble-ations".
Just perfection in every way.
ODO: Another glorious chapter of Klingon history. Tell me, do they still sing songs of the great tribble hunt?
...and what's not to like about this?
FOUR Season 5 episodes in my DS9 Top-Ten:
#1. Trials and Tribble-ations
#3. For The Uniform
#8. Call To Arms
#9. In Purgatory's Shadow