Inquisition (Star Trek: Deep Space Nine)

"Inquisition" is the 142nd episode of the television series Star Trek: Deep Space Nine. It is the 18th episode of the sixth season. This episode introduces Starfleet's secretive intelligence agency, Section 31, which would go on to be featured in future Star Trek television series and films.

Set in the 24th century, Deep Space Nine follows the adventures of the crew of the fictional space station Deep Space Nine, which lies adjacent to a wormhole connecting the Alpha and Gamma Quadrants of the galaxy. The later seasons of the series follow a war between the United Federation of Planets and the Dominion, a hostile empire from the Gamma Quadrant. In this episode, Deep Space Nine's chief medical officer Dr. Julian Bashir is accused of being a spy for the Dominion; the accusations turn out to be a tool to recruit Bashir to join Section 31.

"Inquisition" is one of several espionage stories featured in the later seasons of Deep Space Nine, stemming from a desire to add greater moral ambiguity to the fictional universe of Star Trek.