"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. "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.