Dax (Star Trek: Deep Space Nine episode)

"Dax" is the eighth episode of the American science fiction television series Star Trek: Deep Space Nine.

Set in the 24th century, the series follows the adventures on Deep Space Nine, a space station located adjacent to a stable wormhole between the Alpha and Gamma quadrants of the Milky Way Galaxy, near the planet Bajor.

This episode explores the nature of the fictional Trill species, a humanoid race some of whom are symbiotically "joined" to a long-lived "symbiont" creature, whose memories they share. The station's science officer Jadzia Dax, a Trill, is arrested for a crime of which a previous host of her symbiont is accused.

This episode was co-written by D.C. Fontana, who had also written for Star Trek: The Original Series.