5 Ways Star Trek: Discovery’s Mirror Enterprise Is Different From USS Enterprise

WARNING: Contains SPOILERS for Star Trek: Discovery, season 5, episode 5, "Mirrors"

Summary ISS Enterprise from Mirror Universe makes a surprising return in Star Trek: Discovery, revealing its history and role as a refugee ship.

Star Trek: Discovery used sets from Star Trek: Strange New Worlds to recreate the ISS Enterprise, showcasing its damaged state.

The ISS Enterprise survived until the 32nd century, becoming a beacon of hope like the USS Enterprise in both the Prime and Mirror Universes.

The Mirror Universe ISS Enterprise made a surprising return in Star Trek: Discovery, and the starship differs from the USS Enterprise of Star Trek's Prime Timeline in several ways. Previously, the ISS Enterprise made its first and only appearance in the classic Star Trek: The Original Series episode, "Mirror, Mirror," which saw Captain James T. Kirk (William Shatner) and some of his crew members travel to the Mirror Universe. The ISS Enterprise was the Mirror Universe's doppelganger of the Constitution Class USS Enterprise, and Star Trek: The Original Series simply redressed the Enterprise's sets to evoke the darker alternate reality.

In Star Trek: Discovery season 5, episode 5, "Mirrors," Captain Michael Burnham (Sonequa Martin-Green) and the USS Discovery continue their search for the powerful technology of the Progenitors. Their next clue leads them into a strange wormhole, where they encounter the ISS Enterprise in a pocket of interdimensional space. As Burnham and Cleveland Booker (David Ajala) face off against determined couriers Moll (Eve Harlow) and L'ak (Elias Toufexis), they uncover more about the history of the ISS Enterprise. Directed by Jen McGowan and written by Johanna Lee and Carlos Cisco, "Mirrors" reveals several differences between the USS Enterprise and her Mirror Universe counterpart.

Related Kirk’s Starship Enterprise Returns In Star Trek: Discovery - With A Big Twist The Starship Enterprise makes a shocking return in Star Trek: Discovery season 5, but it's a version that hasn't been seen since TOS season 2.

5 The ISS Enterprise Used Star Trek: Strange New Worlds' Sets

Captain Pike's Enterprise sets were redressed to be its Mirror Universe counterpart.

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To bring the ISS Enterprise to life, Star Trek: Discovery made use of Star Trek: Strange New Worlds' USS Enterprise sets. With different lighting, significant damage, and some logos for the Terran Empire, Captain Christopher Pike's (Anson Mount) Enterprise became the ISS Enterprise first seen in Star Trek: The Original Series' "Mirror, Mirror." Discovery season 5 was filmed in late 2022 during the gap between filming for Strange New Worlds seasons 2 and 3, and they made great use of the bridge, sickbay, transporter room, and hallway sets.

Star Trek: Strange New Worlds has also filmed on Star Trek: Discovery sets, such as turning Federatiion headquarters into the chambers for Number One's (Rebecca Romijn) trial in Strange New Worlds season 2, episode 2, "Ad Astra Per Aspera."

Throughout Star Trek's long history, the franchise has found different ways to depict old ships and other settings. Star Trek: Deep Space Nine's "Trials and Tribble-ations," for example, used footage from the classic TOS episode "The Trouble With Tribbles" combined with new footage of DS9's cast. While parts of the original Enterprise bridge set were recreated for "Trials and Tribble-ations," a full bridge set of a Constitution Class starship was not recreated until the two-part Mirror Universe episode of Star Trek: Enterprise, "In a Mirror, Darkly."

Star Trek: Picard season 3 also completely rebuilt a starship bridge set, this time the bridge of the USS Enterprise-D from Star Trek: The Next Generation.

4 The Plaque On The ISS Enterprise Differs From The USS Enterprise

The passengers on the ISS Enterprise left a plaque telling their story.

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As Captain Burnham and Booker explore the ISS Enterprise, they find a plaque on the wall that details some of the derelict starship's history. While almost every version of the Enterprise has had a plaque of some kind, they have never given a description of the ship's history in this way. Star Trek's starship plaques are often in the background and thus hard to decipher. They typically give the name of the ship, the date and location where the ship was built, and sometimes a list of names of real-life production people who built the sets.

The plaque on the ISS Enterprise reveals that Mirror Universe Spock made significant reforms in the Terran Empire, but was killed by those who disagreed with him. However, those who believed in his ideals stole the ISS Enterprise and found a way to the Prime Universe, with help from Mirror Universe Saru (Doug Jones) - turns out he's "Action Saru in any universe." The crew and refugees aboard this ship likely left the plaque as a way to share the ship's story with whoever happened to find her.

3 Refugees Used The ISS Enterprise To Flee The Mirror Universe

The ISS Enterprise became a lifeboat for refugees seeking a better life.

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After Spock's reforms changed the way the Terran Empire was run, the Empire was not as well equipped to defend itself from the Klingon/Cardassian Alliance. This Alliance eventually conquered the Empire, forcing the Terrans and Vulcans into slavery, and violently quashing any attempts at rebellion. Some rebels, however, managed to successfully stand against the Empire, at least long enough to gather a ship full of refugees and escape to the Prime Universe.

The Mirror Universe's Spock (Leonard Nimoy) became the High Chancellor who reformed the Terran Empire but was later assasinated.

While the crew of the original USS Enterprise often helped refugees and others in need, this was not the ship's main purpose. The ISS Enterprise was originally a warship used by the Terran Empire, before its crew mutinied and fled the brutal Mirror Universe. For this undoubtedly dangerous journey, the ISS Enterprise became a refugee ship, giving those who had believed in Spock's reforms the chance for a new life in a brighter universe.

Related What Happened To Mirror Universe Captain Kirk In Star Trek? Star Trek: Discovery returns to the Mirror Universe, which raises questions about what happened to the Terran Empire's Captain Kirk after TOS.

2 The ISS Enterprise Survived Until The 32nd Century

No other Enterprise has survived as long as the ISS Enterprise.

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After the ISS Enterprise traveled to the Prime Universe, it ended up inside interdimensional space, where it remained undetected for centuries. Although the ship had sustained significant damage, it was salvageable and able to be sent back to Starfleet after Captain Burnham and Book used it to escape through the wormhole. While the technology on the ISS Enterprise is very outdated, the Federation will likely be interested in a 23rd-century starship from the Mirror Universe, particularly one as important as the Enterprise.

By the 32nd century, travel between the Mirror Universe and the Prime Universe had already "been impossible for centuries," according to Captain Burnham.

As Star Trek has a habit of destroying the Starship Enterprise, the ISS Enterprise is likely the longest-surviving ship of that name. The original USS Enterprise (NCC-1701), as commanded by Captain Pike and Captain Kirk, was destroyed in 2285 when Kirk was forced to initiate self-destruct to thwart a Klingon boarding party in Star Trek III: The Search for Spock. Several different ships have taken the name Enterprise over the years, but none have survived for as long as the ISS Enterprise.

1 One Surprising Thing The Mirror Universe Ship & USS Enterprise Have In Common

The Starship Enterprise is a beacon of hope in every universe.

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The Mirror Universe's ISS Enterprise may have several noticeable differences from its Prime Universe counterpart, but both ships became a beacon of hope for the people aboard. Throughout the journeys of Star Trek: The Original Series and Star Trek: Strange New Worlds, the USS Enterprise has come to represent hope for numerous peoples and civilizations all over the galaxy. Countless lives would have been lost (and the galaxy destroyed multiple times over) if not for ships named Enterprise. While the ISS Enterprise caused a lot of harm during its time as a Terran warship, in the end, it became a lifeboat for the people who wanted to leave the Mirror Universe.

Star Trek: Discovery has proven that, no matter the universe, the Starship Enterprise remains a beacon of hope and a spark of light in the darkness.

Wanting to escape the violence and darkness of their own universe, the refugees risked their lives for a chance at peace and freedom. When Captain Kirk and his crew first visited the ISS Enterprise, most of its crew members were just as ruthless as every other Terran. But Kirk took a chance on Mirror Universe Spock, and while Spock's reforms ultimately failed, he inspired some Terrans to seek out a better life. If nothing else, Star Trek: Discovery has proven that, no matter the universe, the Starship Enterprise remains a beacon of hope and a spark of light in the darkness.

New episodes of Star Trek: Discovery stream Thursdays on Paramount+.