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The Adversary 

The Defiant is off to show the Federation's presence to the new Tzenkethi government. While underway the ship malfunctions and repeated instances leads Sisko to believe a changeling's onboard, engaging in sabotage.


Alexander Singer


Gene Roddenberry (based upon "Star Trek" created by), Rick Berman (created by) | 4 more credits »




Episode complete credited cast:
Avery Brooks ... Cmdr. Benjamin Sisko
Rene Auberjonois ... Odo
Alexander Siddig ... Doctor Bashir (as Siddig El Fadil)
Terry Farrell ... Lt. Jadzia Dax
Cirroc Lofton ... Jake Sisko
Colm Meaney ... Chief Miles O'Brien
Armin Shimerman ... Quark
Nana Visitor ... Major Kira
Lawrence Pressman ... Krajensky
Ken Marshall ... Michael Eddington (as Kenneth Marshall)
Jeff Austin ... Bolian
Majel Barrett ... Computer Voice (voice)


Sisko takes the Defiant to Tzenkethi space. Whilst working on the ship O'Brien hears strange sounds, and soon, breakdowns and mishaps start occurring. Sisko believes tone of those on-board causing what he - or she - appears to be, and the occurrences are acts of sabotage. Written by Arnoud Tiele (imdb@tiele.nl)

Plot Summary | Add Synopsis


TV-PG | See all certifications »

Did You Know?


This episode marks the first appearance of several new sets aboard the Defiant, namely main engineering, the mess hall and the extended corridor set. See more »


When Chief O'Brien is working in a Defiant Jefferies tube, about 10 minutes into the episode, he hears noises and starts to go up the tube, leaving the panel he was working at open. He looks back the way he came a moment later. We see down the Jefferies tube, but panel he left open is no longer open. See more »


[first lines]
Commander Sisko: Commander's log, stardate 48959.1 - It is with mixed emotions that I record this, my final Commander's log. The last three years have been the most demanding and rewarding of my career. I can only hope that the future will hold even greater challenges.
See more »


References 1964 World Series (1964) See more »


For He's a Jolly Good Fellow
Performed by Terry Farrell, Nana Visitor, Colm Meaney and other crew members
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User Reviews

Those Changelings REALLY suck!!!
28 December 2014 | by MartinHaferSee all my reviews

Commander Sisko has just been promoted to captain (yippee). As his first assignment, he is to take the Defiant to some settlement across space to stop some rebellion. However, partway there, it becomes obvious that the Ambassador is actually a changeling and the entire mission is actually a chance for the Founders to star a huge intergalactic war!! Apparently, humanoid lives mean nothing to these annoying jerks! So, it's up to Sisko and the crew to regain control of their ship AND find the changeling now that he's disappeared into the ship.

This is a very tense episode with lots of surprises and twists. I also appreciated the ending when you see Odo do something you'd never expect! All in all, one of the better episodes--which is true of all the Changeling episodes.

By the way, it was rather funny in a small scene between Captain Sisko and Commander Eddington (the security guy recently assigned to DS9). Eddington wants to become a captain himself but complains that 'no one who wears yellow ever becomes a captain'. What about Kirk?

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Release Date:

19 June 1995 (USA) See more »

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Production Co:

Paramount Television See more »
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Aspect Ratio:

1.33 : 1
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