Star Trek: Deep Space Nine S06 E16 Change of Heart

"At the edge of the Final Frontier, the Universe's greatest mystery is about to unfold."

Stardate: 51597.2. Worf and Jadzia travel to the badlands to procure some information on the Dominion from a traitorous Cardassian. Bashir wants to engage in a holo-suite spy simulation, but O'Brien prefers to brush up on his tongo game after watching Jadzia lose to Quark.