"For the Cause" is the 94th episode of the science fiction television series Star Trek: Deep Space Nine, the 21st of the fourth season. It was first broadcast on March 6, 1996. Set in the 24th century, the series follows the adventures of the crew of the space station Deep Space Nine near the planet Bajor, as the Bajorans recover from a decades-long occupation by the imperialistic Cardassians. In the middle seasons of the series, as the United Federation of Planets maintains an uneasy peace with Cardassia, a recurring plot thread involves the Maquis, a renegade terrorist group of Federation nationals trying to strike back against the Cardassians. In this episode, suspicion falls upon civilian freighter captain Kasidy Yates (Penny Johnson), the girlfriend of station commander Benjamin Sisko, as a possible Maquis accomplice, but the true Maquis agent turns out to be a member of Sisko's crew, Lieutenant Commander Michael Eddington (Kenneth Marshall). Plot The Federation plans to deliver several replicators through Deep Space Nine to Cardassia following attacks by the Klingons that debilitated the Cardassian industrial base. Eddington briefs DS9's command staff that Starfleet fears that the shipment will be intercepted by the Maquis. Eddington and Security Chief Odo warn Captain Sisko that they believe his girlfriend, Kasidy Yates, is working with the Maquis. Sisko is reluctant to believe them, but after Yates refuses to allow her cargo to be inspected, he instructs Lieutenant Commander Worf to follow Yates' ship, the Xhosa, in the Defiant. Worf confirms that the Xhosa delivered supplies to a Maquis ship in a region of space known as the Badlands. Eddington tells Sisko he is unwilling to take responsibility for arresting Yates, so Sisko takes command of the Defiant to follow the Xhosa to its next rendezvous with the Maquis. When no Maquis ship arrives, Odo suggests this operation might have been a ruse to lure Sisko away from Deep Space Nine. Sisko confronts Yates on the Xhosa. She claims she has only been delivering medical supplies to the Maquis, and was told that today's delivery was urgent. Fearing deception, Sisko lets Yates go and sets course back to Deep Space Nine. Meanwhile, in Sisko's absence, Eddington orders Deep Space Nine's security crew to transfer the replicators to a waiting ship. After rendering second-in-command Major Kira unconscious, he removes his badge and flees the station. When Sisko returns, Eddington contacts him to acknowledge his