Star Trek: Deep Space Nine, Series 5, Episode 24.
First broadcast on Monday 19 May 1997.

This week, Deep Space Nine does the best that it can with a slasher horror premise involving four redshirts and some murderous Cardassians, including beloved secondary character, plain, simple Garak. Fortunately, no one suffers any long-term ill-effects — except for the people who are no longer around to complain, I suppose.