Star Trek: Deep Space Nine (1993)

S5E14 In Purgatory's Shadow (1)

Stardate: Unknown. A mysterious transmission from the Gamma Quadrant sparks Garak's hope that his former mentor, Enabran Tain, may still be alive. Teaming up with Worf, they set out to locate him, but instead uncover a more alarming reality: a Dominion invasion fleet is ready to launch an assault on the Alpha Quadrant.