Star Trek: Deep Space Nine: Season 2, Episode 23

Crossover (15 May 1994)

TV Episode  -   -  Action | Adventure | Drama
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Kira and Bashir find themselves in an alternate universe.



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Title: Crossover (15 May 1994)

Crossover (15 May 1994) on IMDb 7.9/10

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Episode cast overview:
Doctor Bashir (as Siddig El Fadil)
Jake Sisko (credit only)
Telok (as John Cothran Jr.)
Jack Orend ...
Human (as Jack R. Orend)
Dennis Madalone ...


Kira and Bashir are returning from the opening of a hospital on New Bajor in the Gamma Quadrant. Just before the runabout enters the wormhole, there's a sudden problem. Kira is able to solve it, but when they arrive in the Alpha Quadrant things seems to have changed. Deep Space Nine is once again orbiting Bajor and the runabout is entered by Klingons, who excuse themselves when they see Kira. It soon becomes clear the two have arrived in alternate universe. Klingons, Cardassians and Bajorans have formed an alliance against Earth and humans are forced to do slave labor on Deep Space Nine. The station is led by intendant Kira. She tells a certain Kirk traveled from the other side earlier. While Bashir is sent away to ore processing, intendant Kira seems to really like her other self. Written by Arnoud Tiele (

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Release Date:

15 May 1994 (USA)  »

Company Credits

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Technical Specs


Aspect Ratio:

1.33 : 1
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Did You Know?


The Star Trek (1966) Universe revisits the Mirror Universe for the first time since Star Trek: Mirror, Mirror (1967). Star Trek: The Next Generation (1987) never visited that theme, although similar parallel universes were viewed in episodes such as Star Trek: The Next Generation: Yesterday's Enterprise (1990) and Star Trek: The Next Generation: Parallels (1993). The Mirror Universe would return in follow-up episodes of Star Trek: Deep Space Nine (1993), and also be featured in Star Trek: Voyager (1995) and Star Trek: Enterprise (2001). See more »


Mirror Garak: [after having Quark arrested] I shall miss him. He always let me win at dabo.
See more »


References Star Trek: Mirror, Mirror (1967) See more »


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

Kira Nerys and Bashir in the Red Fringe 'Verse
10 June 2012 | by (United States) – See all my reviews

That is, if in fact this alternate universe is the same as "the Other Side" from that series.

In Fact, the entire concept of Alternate Universes was brought up in the TOS Episode "Mirror, Mirror" - And that was a highly unusual concept for Television in those days. But as The Original Series episodes were always written by high profile and usually Hugo-Award winning Science Fiction Authors, it was not unusual for Trek in itself. Therefore, this episode is a big "about time" episode-About time they brought back "The Mirror 'Verse" to Trek.

Add to this, that this episode is a 24th century continuation of the story that Kirk meddled in: This shows that indeed, Spock did take over the ISS Enterprise and became a pivotal figure in directing the Terran Empire toward a peaceful existence.

But because of that, the Terran Empire became weak, and was overthrown by what we have here: The Klingon-Cardassian Alliance.

This storyline was never investigated in The Next Generation, but here, it begins and becomes one of our favorite Deep-Space Nine story arcs, and is fit in to the general story of DS9 on several occasions.

But here is the first iteration: Kira and Bashir are returning through the Wormhole and a thruster malfunction causes them to Cross Over like Olivia does in Fringe. They find the Station way over by Bajor, and they are escorted in by a Klingon Battle Cruiser.

When they get there they are met by Garak and "The Intendant"-Who is Kira herself!

Garak is a Full Cardassian here, and Kira is the "Intendant" of the Station. She is fascinated by Nerys, but they shove Bashir in the Ore Processing Plant-The overseer is Odo, and this Odo is not very nice either.

While Nerys entertains The Intendant, Bashir meets "Smiley" O'Brien, named by that Universes "Sisko"-Who is a Pirate for The Intendant.

But Bashir knows they are in the Mirror Universe, he is able to tell Nerys that she must get access a Transporter which they might be able to rig to get them back across. Bashir wants to get "Smiley's" help with that, but "Smiley" is a bitter man, although he is still a Mechanical Genius.

Nerys Approaches Quark, who she thinks may help them for a Profit, but in fact Quark is willing to help them anyway-He helps to smuggle Terrans off of the station! But Quark is caught and killed by The Intendant, closing off that avenue of Escape.

But now, Garak has his agenda he wishes to impose onto Nerys, so the prospect of escape becomes more important than ever.

Bashir tells "Smiley" all about Miles on the other side, and this piques Smiley's interest, enough to elicit his help. Smiley causes an explosion in the Ore Processing Plant - And Bashir uses a Disruptor on Odo, splattering him all over, killing him. But they are caught by a Klingon-The same Klingon that was in the Next Generation Episode called "The Chase"-He is overheard boasting about working for "The Duras Family" and he mentions Lursa and Bet'or. But this Klingon catches Bashir and Smiley and they are brought in front of The Intendant, most likely to be executed.

All through this, the Alternate-Sisko may be a creep, but he is highly fond of Smiley: So, when The Intendant makes it clear that she is going to kill Smiley, Sisko "Changes his Mind" and paves a route of escape for Nerys, Bashir, Smiley and others. Smiley goes with Sisko, and Nerys and Bashir finally get back to their Runabout, using the same malfunction to get home. Fortunately, the people in the Mirror 'Verse have not discovered The Wormhole yet, and they are able to escape by the seat of their pants.

This episode is great Character development — exploring the main DS9 characters by showing their Mirror Doppelgangers. And the fact that the Mirror Odo and Quark get killed, shows that DS9 was not afraid of really getting their teeth into the Mirror storyline and abusing it for all it's worth. A very effective episode, and one of my favorite of the series. The actor who reprises the Klingon role from the earlier Next Gen episode is not credited. Ironically, that Next Generation Episode had Salome Jens playing the Specter of "An Alien Race from which most of the Humanoids had descended from"-Salome Jens was to become the Matriarch of the Shapeshifters, so that this episode reaches back and accommodates that episode from The Next Generation is very fitting, and provides a sort of continuity between The Next Generation and Deep Space Nine.

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