The Defiant is off to show the Federation's presence to the new Tzenkethi government. While underway the ship malfunctions and Bashir is suspected of sabotage.



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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 (

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Plot Keywords:

24th century | See All (1) »





Release Date:

19 June 1995 (USA)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


The scene in the Defiant's mess hall where the senior officers are taking blood samples of each other to determine which one of them is the Changeling is very reminiscent of the 1982 John Carpenter film The Thing. This film is based on the 1938 John W. Campbell, Jr. (writing under the pseudonym of Don A. Stuart) short story "Who Goes There?", which contains a very similar scene. However, the writers cite neither the original story nor the Carpenter film as their primary inspiration for this episode, but rather the 1951 Christian Nyby film adaptation, called The Thing From Another World. That film did not feature the theme of paranoia or shapeshifters as the story or the later film adaptation did. Paranoia was something the writers were interested in exploring, as it was something rarely seen in the Star Trek universe. 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.
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References Star Trek: Deep Space Nine: The Search: Part 2 (1994) See more »


Star Trek: Deep Space Nine - Main Title
Written by Dennis McCarthy
Performed by Dennis McCarthy
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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?

1 of 2 people found this review helpful.  Was this review helpful to you?

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