Star Trek: Deep Space Nine: Season 4, Episode 21

For the Cause (6 May 1996)

TV Episode  |   |  Action, Adventure, Drama
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Reviews: 2 user | 1 critic

Sisko must face betrayal when evidence surfaces that Kasidy is smuggling for the Maquis. Meanwhile Garak makes acquaintance with Ziyal.



(based upon "Star Trek" created by), (created by), 3 more credits »
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Episode cast overview:
Kasidy Yates (as Penny Johnson)
Michael Eddington (as Kenneth Marshall)
John Prosky ...
Steven Vincent Leigh ...
Lt. Reese


As Deep Space Nine awaits the arrival of equipment for the Cardassian government, Sisko fears the Maquis might do something about it and increases security. Eddington and Odo have an unpleasant message for him; they suspect Kasidy Yates is involved in smuggling for the Maquis. Meanwhile, Garak can't keep his eyes of Ziyal, and she returns his looks every time. Garak is still wary, though, as she's the daughter of his archenemy, Dukat, and under the protection of Kira, who isn't too fond of the tailor either. Written by Arnoud Tiele (

Plot Summary | Plot Synopsis

Plot Keywords:

24th century | See All (1) »





Release Date:

6 May 1996 (USA)  »

Company Credits

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Aspect Ratio:

1.33 : 1
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Did You Know?


This takes place in 2372. See more »


The scene in Garak's shop, Quark tells him that his pants are, "a meter too long." A meter is about 3 feet 3 inches and Quark is only 5'6", so this is either a goof in dialogue or Quark wants some short-shorts. See more »


[first lines]
Captain Sisko: Kasidy Yates, where are you going?
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Star Trek: Deep Space Nine - Main Title
Written by Dennis McCarthy
Performed by Dennis McCarthy
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User Reviews

Is Kasidy a traitor?
3 January 2015 | by (Bradenton, Florida) – See all my reviews

When the show begins, you learn that some replicators are being secretly sent to the Cardassians by the Federation. Commander Eddington and Odo also approach Captain Sisko with a problem. They think that there's a good chance that Sisko's girlfriend, Kasidy Yates, is working with the Maquis*. But Sisko isn't about to just accuse her and he and his folks keep tabs on her and her space voyages. However, it turns out that this is all a ruse--and Eddington has ulterior motives. But what exactly is he up to?!

In addition to this plot, Mr. Garak has taken time away from his bromance with Dr. Bashir to may a lot of attention to Dukat's daughter, Ziyal. But this relationship, if there is one, is obviously fraught with problems since Dukat and Garak are sworn enemies.

Overall, this is a pretty exciting episode--mostly because it isn't stuck on DS9. Unfortunately, Eddington's behaviors were telegraphed in many ways, so none of this came as a huge shock--he obviously was never intended as a regular or one of the 'good guys'--a serious weakness of the show.

*Oddly, near the beginning of the show when Worf talks about the Maquis, he refers to them as the 'Marquis'.

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