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.



(based upon "Star Trek" created by), (created by) | 3 more credits »

Watch Now

With Prime Video



Add Image Add an image

Do you have any images for this title?



Episode cast overview:
Doctor Bashir (as Siddig El Fadil)
Michael Eddington (as Kenneth Marshall)
Computer Voice (voice)


There's a party on Deep Space Nine, as Sisko has just been promoted to captain. Ambassador Krajensky is in attendance, but, he's there to tell of a coup which just took place on the Tzenkethi home world. Krajensky wants to remind them the Federation is still committed to the protection of the colonies. Sisko takes the Defiant to Tzenkethi space. While working on the ship O'Brien hears some strange sounds, and soon the communications array malfunctions. O'Brien and Dax discover a parasitic tube-like system which is invading the ship's equipment, protected by a forcefield, which must be stopped before it takes full control leaving the crew to die. Written by Arnoud Tiele (

Plot Summary | Add Synopsis

Plot Keywords:

24th century | See All (1) »





Release Date:

19 June 1995 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


The fight between Odo and the Changeling at the end of the episode was extremely complicated to put together due to all the morphing effects. Producer Steve Oster points out that there are more morphing effects in this short scene than in the entire third season. According to actor Rene Auberjonois, after principal photography was completed, all the cast were allowed to leave except himself and Lawrence Pressman. He explains that during the main shoot, he and Pressman had filmed the scene as normal, but to make sure the effects would work properly, each of them then had to re-enact the scene separately, looking at a monitor and matching their movements exactly. (Star Trek: Deep Space Nine Companion) There are actually some clips of both actors shooting the fight without the other present in the Deep Space Nine Chronicles intro to this episode. See more »


14:45 during the scene on the bridge, a boom mic and even the boom on which it is mounted is clearly visible at the top edge of the screen centered approximately over the captains chair and remains visible (and moving) from that camera angle. 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 »


Star Trek: Deep Space Nine - Main Title
Written by Dennis McCarthy
Performed by Dennis McCarthy
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Those Changelings REALLY suck!!!
28 December 2014 | by (Bradenton, Florida) – See 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?

4 of 6 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Avery Brooks and Nana Visitor shermandemetrius
Anyone else find it odd that this show strayed from its premise? anonymous1235
Happy Birthday Morn!! burn72
I love StarTrek... But I just can't get into and enjoy this show. andy-1
Section 31 is necessary and good Eisen_Faust
Jadzia Dax....Useless ryhoyarbie
Discuss The Adversary (1995) on the IMDb message boards »

Contribute to This Page

Create a character page for: