Mirror Universe Spock’s Fate In Star Trek: Discovery Explained

Warning: SPOILERS for Star Trek: Discovery Season 5, Episode 5 - "Mirrors"

Summary Mirror Universe Spock's death led to a revolution in the Terran Empire, but ultimately couldn't prevent its downfall.

The ISS Enterprise became a symbol of hope in the Mirror Universe, with rebels seeking freedom in the Prime Universe.

Dr. Cho, a refugee from the Mirror Universe, rose to become a Branch Admiral in Starfleet, shaping her own future.

Star Trek: Discovery confirmed the fate of Mirror Universe Spock (Leonard Nimoy) after the events of the classic Star Trek: The Original Series episode, "Mirror, Mirror." Since its first appearance on TOS, several Star Trek series have visited the Mirror Universe, a parallel universe populated by evil versions of Star Trek's heroes. In the Mirror Universe, the xenophobic Terran Empire serves as the antithesis to the United Federation of Planets, and torture and murder are commonplace. Captain Michael Burnham (Sonequa Martin-Green) and the USS Discovery are already familiar with the Mirror Universe, as they spent some time there in Discovery season 1.

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In Star Trek: Discovery season 5, episode 5, "Mirrors," Captain Burnham and Cleveland Booker (David Ajala) follow couriers Moll (Eve Harlow) and L'ak (Elias Toufexis) into interdimensional space in search of the next clue leading to the Progenitors' treasure. Once there, they find the damaged ISS Enterprise, which holds clues about the fate of Mirror Universe Spock and his crew. In Star Trek: The Original Series season 2, episode 4, "Mirror, Mirror," Captain James T. Kirk (William Shatner) encourages Mirror Spock to initiate change, telling him: "In every revolution, there's one man with a vision." Written by Johanna Lee and Carlos Cisco, and directed by Jen McGowan, Star Trek: Discovery's "Mirrors" offers more insight into what became of that revolution.

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.

What Happened To Mirror Universe Spock Revealed By Star Trek: Discovery

Spock died fighting for change.

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After the events of Star Trek: The Original Series' "Mirror, Mirror," Captain Kirk left Mirror Universe Spock with a lot to think about. The goateed Vulcan apparently took Kirk's words to heart and began enacting a series of reforms to change the way things were done in the Terran Empire. Although he was attempting to prevent the collapse of the Empire, Star Trek: Discovery revealed that Spock was killed while working on his reforms. In Star Trek: Discovery season 5, episode 5, Burnham and Book explore the ISS Enterprise and discover a plaque detailing some events from the Mirror Universe.

“The light of hope shines through even the darkest of nights" became a "rallying cry" for those who opposed the violence of the Terran Empire.

Reading from the plaque, Book says that the "Terran High Chancellor was killed for trying to make reforms." Although Michael does not know that Spock was the Terran High Chancellor, the audience knows this information in Star Trek: Deep Space Nine's Mirror Universe episodes. Spock helped turn the Terran Empire into a more peaceful galactic power, and while his reforms were popular with many, some clearly opposed them. Nevertheless, Spock's dedication to logic made him less villainous than his Mirror Universe counterparts, and his words: “The light of hope shines through even the darkest of nights" became a "rallying cry" for those who opposed the violence of the Terran Empire.

Star Trek: DS9 Reveals What Happened To Mirror Universe After Spock’s Death

Spock initiated change, but couldn't prevent the fall of the Terran Empire.

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In Star Trek: Deep Space Nine season 2, episode 23, "Crossover," Major Kira Nerys (Nana Visitor) and Dr. Julian Bashir (Alexander Siddig) find themselves in the Mirror Universe. Major Kira's Mirror Universe counterpart, Intendant Kira, runs the equivalent of Deep Space Nine (Terok Nor) as a mining station populated by Terran slaves. The Intendant reveals that Captain Kirk's visit to the Mirror Universe had a "profound influence" on Mirror Universe Spock, which led Spock to reform the Terran Empire. Unfortunately, these reforms rendered the Empire unable to defend itself when the Klingon/Cardassian Alliance decided to attack.

After conquering the Terran Empire, the Alliance proved to be just as brutal and eventually became ruled by Regent Worf (Michael Dorn).

Having been under Terran occupation for years, Bajor petitioned for entry into the Klingon/Cardassian Alliance and went on to become a major player in the Alliance. Much like Kirk's visit to the Mirror Universe affected Spock, Major Kira and Dr. Bashir's visit inspired a rebellion among the Terran slaves, which became a thorn in the side of the Alliance. Although Spock had initially been trying to prevent the fall of the Terran Empire, the Empire fell away, but some people held on to the ideals Spock had tried to spread.

Related Star Trek 10’s Best Mirror Universe Variants The Mirror Universe is home to the darkest and most depraved versions of our favorite Star Trek characters, but which of these variants is best?

Star Trek: Discovery Reveals What Happened To Mirror Universe Spock’s ISS Enterprise

The ISS Enterprise became a symbol of hope and freedom.

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The plaque Captain Burnham and Cleveland Booker find on the Mirror Universe's ISS Enterprise also reveals some events after Mirror Spock's death. After Spock was killed, those who believed in his reforms sought help from a "Kelpian slave turned rebel leader," aka, the Mirror Universe version of Saru (Doug Jones). Saru told these people about Star Trek's Prime Universe, describing it as "a near perfect mirror that casts our darkness into light." While Saru stayed behind to help more people in the Mirror Universe, several rebels stole the ISS Enterprise and traveled to the Prime Universe to begin new lives.

Dr. Cho was also one of the six scientists who helped hide clues to the Progenitors' technology.

Upon returning to the USS Discovery, Michael finds proof in Federation databases that many of the refugees on the ISS Enterprise successfully made new lives for themselves in the Prime Universe. One refugee, named the Enterprise's Science Officer, Dr. Cho, joined Starfleet and eventually became a Branch Admiral. Dr. Cho was also one of the six scientists who helped hide clues to the Progenitors' technology, which remains at the center of Star Trek: Discovery season 5's quest. Michael remarks that Cho may have chosen to leave her clue on the Enterprise as a reminder that almost anyone can shape their own future, even when facing impossible odds.

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