Star Trek: Deep Space Nine: Season 5, Episode 14 - ProjectFreeTV

5 - 14: In Purgatory's Shadow

Garak and Worf investigate a coded message which suggests that Garak's mentor, Enabran Tain, is still alive in the Gamma Quadrant. However, when their search for answers leads them into Dominion space, the pair discover something far worse than they had expected.