Star Trek: Deep Space Nine S01 E12 Battle Lines

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

Stardate: Unknown. Sisko, Kira, and Bashir take Kai Opaka through the wormhole for a brief excursion in the Gamma Quadrant. But when they crash-land on a desolate planet, they find a divided, warring penal colony where no one ever dies.