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"Star Trek: Deep Space Nine" Crossover (TV Episode 1994) Poster

Trivia

Writer Robert Hewitt Wolfe wrote the fall of the Terran Empire into the script as an analogy for the fall of the Roman Empire to barbarians and the Chinese Dynasty to the Mongols. He also wanted to illustrate that if an Empire is as brutal as the Terran Empire was in Star Trek: Mirror, Mirror (1967), there were probably reasons why it was so brutal and he wished to convey the message that, in such circumstances, one cannot change things overnight, and even the actions of Captain Kirk can have severe consequences.
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The Star Trek Universe revisits the mirror universe for the first time since Star Trek: Mirror, Mirror (1967). Star Trek: The Next Generation (1987) never visited this 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 this series, and one story arc on Star Trek: Enterprise (2001).
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This is the only mirror universe episode in which the crossover is made via the Bajoran wormhole. All subsequent episodes show the crossover being made by way of a specially adapted transporter. The non-canon novel Fearful Symmetry claims this is because the crossover in this episode was a deliberate attempt by the Prophets to connect the two universes.
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Prior to the establishment of the history of the televised mirror universe, a mirror version of O'Brien appeared in the novel Dark Mirror, depicting a mirror universe in which the Terran Empire had survived well into the 24th century. That version of O'Brien served as a conn officer aboard the ISS Enterprise (ICC-1701-D) from 2364 until at least 2367.
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In Star Trek 101, Terry J. Erdmann and Paula M. Block list "Crossover" as being one of the "Ten Essential Episodes" from Star Trek: Deep Space Nine.
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This takes place in 2370.
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Mirror Odo's uniform sports a belt, which Rene Auberjonois liked so much that he began using it in his regular series Odo uniform as well, starting in Season 3.
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The original title of "Crossover" was to be "Detour". (Star Trek: Deep Space Nine Companion - A Series Guide and Script Library)
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The knife wielded by the Terran knocked over by Telok, was a Klingon tool designed by Rick Sternbach for Star Trek: Deep Space Nine: Blood Oath (1994).
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Jake Sisko does not appear. Follow ups would establish that Jake Sisko was never born in the mirror universe.
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The teaser scene in which the two Klingon soldiers board the runabout is intentionally shot from extreme angles, which director David Livingston compared to essentially shooting up the actors' noses. He did this to emphasise how different things were in the mirror universe.
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This is listed as one of the "Ten Essential Episodes" of Star Trek: Deep Space Nine (1993) in the 2008 reference book "Star Trek 101" by Paula M. Block and Terry J. Erdmann.
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After "Crossover" aired, there was a great deal of discussion about how sexy and alluring Nana Visitor was as the Intendant, with the costume she wore garnering a great deal of attention. According to costume designer Robert Blackman, the general consensus amongst fans was that it was the revealing nature of her costume which gave Visitor this new level of seductiveness.
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See also

Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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