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

Summary

• Star Trek: Discovery's next clue is hidden aboard the Mirror Universe's ISS Enterprise trapped in interdimensional space.
• L'ak is a Breen with a blood bounty on his head, and his backstory with Moll is revealed.
• The USS Discovery crew, led by Commander Rayner, helps save Burnham and Book and bring the ISS Enterprise into the Prime Universe, but Moll and L'ak escape.

Star Trek: Discovery season 5, episode 5, "Mirrors," ends with Captain Michael Burnham (Sonequa Martin-Green) and the USS Discovery's crew grappling with jaw-dropping reveals about the Mirror Universe's ISS Enterprise, L'ak's (Elias Toufexis) species, and the next clue in the hunt for the Progenitors' treasure. Written by Johanna Lee and Carlos Cisco and directed by Jen McGowan, the thrilling "Mirrors" sends Burnham and Cleveland Booker (David Ajala) into interdimensional space after Moll (Eve Harlow) and L'ak and the third Progenitors' clue, but they found a lot more than they bargained for.

In Star Trek: Discovery season 5, episode 5, Captain Burnham, Cleveland Booker, Moll, and L'ak are all trapped aboard the derelict ISS Enterprise after Burnham's shuttle and L'ak's ship are destroyed by interdimensional space, a dangerous region between Star Trek's Prime and Mirror Universes. Michael ingeniously uses the Enterprise's tractor beam to send a distress signal to the USS Discovery, where Commander Rayner (Callum Keith Rennie) and the bridge crew find a way to keep the aperture of the interdimensional space wormhole open to fly the ISS Enterprise through. However, L'ak and Moll make their escape, leaving Burnham, Book, and the Starfleet heroes to grapple with the third clue to the Progenitors' treasure, and what they learned and found in the wormhole.

The ISS Enterprise's first and only previous appearance was in Star Trek: The Original Series season 2's "Mirror, Mirror", which introduced the Mirror Universe.

Captain Kirk's Mirror Universe ISS Enterprise Now Belongs To 32nd Century Starfleet

It's been a long road for the ISS Enterprise

The Mirror Universe's ISS Enterprise becomes the property of the 32nd century's Starfleet and United Federation of Planets at the end of Star Trek: Discovery season 5, episode 5, "Mirrors." Captain Burnham assigned Lt. Commanders Kayla Detmer (Emily Coutts) and Joann Owosekun (Oyin Oladejo) - who don't actually appear in the episode - to fly the ISS Enterprise back to Federation HQ to be put into "storage". However, the acquisition of a major historical find like a 23rd-century Constitution Class starship filled with Terran Empire technology from the Mirror Universe is bound to be of interest to Dr. Kovich (David Cronenberg).

After the Temporal Wars, crossing over between the Mirror Universe and Star Trek's Prime universe is now impossible, but the ISS Enteprise was trapped in interdimensional space for centuries, which crossing over could still happen.

Star Trek: Discovery season 5, episode 5's ISS Enterprise scenes were filmed on the USS Enterprise sets of Star Trek: Strange New Worlds. Discovery season 5's production took place at the end of 2022, after Strange New Worlds season 2 had wrapped in June and long before Strange New Worlds season 3 filming started in December 2023. The USS Enterprise's bridge, medical bay, transporter room, and hallways were redressed to turn the starship into its Mirror Universe counterpart.

Commander Michael Burnham previously came aboard Captain Christopher Pike's (Anson Mount) USS Enterprise in Star Trek: Discovery season 2.

Star Trek: Discovery's Mirror Universe Revelations

We found out what happened to Mirror Spock and Mirror Saru

Star Trek: Discovery season 5, episode 5's ISS Enterprise appearance answered some big questions about the events of the Mirror Universe after Star Trek: The Original Series' "Mirror, Mirror." Cleveland Booker learned from the plaque where the Enterprise's missing crew left their story behind that the Terran High Chancellor was assassinated after making reforms. This refers to the Mirror Universe's Spock (Leonard Nimoy), who was urged by the Prime Universe's Captain James T. Kirk (William Shatner) to make reforms to prevent the inevitable collapse of the Terran Empire, which happened anyway.

Star Trek: Deep Space Nine's Mirror Universe episodes revealed that the Terran Empire, weakened by Spock's reforms, was conquered by the Klingon-Cardassian Alliance.

Refugees led by a Kelpien slave-turned-rebel leader - Saru (Doug Jones) - used the ISS Enterprise to flee the Mirror Universe for the Prime Universe in the 23rd century, but the starship was trapped in interdimensional space. The Enterprise's crew eventually used the ship's shuttles and escape pods to abandon the starship in an effort to make it to the Prime Universe. Some did make it through, including the ISS Enterprise's junior science officer, Dr. Cho, who later joined Starfleet and became a branch Admiral in the 24th century.

Jinaal Bix redacted the names of the scientists who found the Progenitors' technology, including Dr. Cho.

Moll & L'ak Escaped Discovery With A Breen Bounty On Their Heads

L'ak is the nephew of the Breen Primarch

Star Trek: Discovery season 5, episode 5 revealed the backstory of Moll and L'ak, including the revelation that L'ak is Breen. Years before Star Trek: Discovery season 5, Moll was a courier who sold latinum to the Breen Imperium, where she met L'ak, the nephew of the Breen's Primarch Ruhn (Tony Nappo), who had fallen out of favor and was working in the shuttle bay. Moll and L'ak fell in love, and L'ak committed a crime against the Breen by consorting with "a lesser being" and removing his helmet to show Moll his true face. Confronted by his uncle, L'ak shot the Primarch and fled with Moll.

Moll and L'ak used one of the ISS Enterprise's remaining warp pods to flee capture.

Moll and L'ak both have an Erigah, a Breen blood bounty, on their heads, and they hope that finding the Progenitors' treasure and selling it to the Breen will buy their freedom. Neither Moll and L'ak want the Federation's help offered by Captain Burnham, and they would "rather die" than be separated in a Federation prison. L'ak was injured in a brawl with Burnham, but instead of seeking medical attention from the USS Discovery, Moll and L'ak used one of the ISS Enterprise's remaining warp pods to flee capture. However, this time, Moll and L'ak left behind a warp trail Discovery can follow.

Cleveland Booker Tries To Connect With Moll

Booker's mentor was Moll's absentee father

Cleveland Booker has personal reasons to connect with and save Moll. Moll's real name is Malinne Booker, and she is the daughter of Book's late mentor, Cleveland Booker IV. Moll's father abandoned her and her mother to become a courier and raise the funds needed to move his family to a new home in the Gamma Quadrant. However, Booker IV's dangerous life as a courier and dealings with criminal organizations like the Emerald Chain made him keep his distance from Malinne, who blamed him for leaving her behind.

Moll doesn't want Cleveland Booker in her life.

Moll became a courier like her father to do what he didn't and earn enough latinum to move to the Gamma Quadrant, but Moll's entire world shifted when she fell in love with L'ak and the Breen placed a blood bounty on their heads. Moll doesn't want Cleveland Booker in her life, but she relents when she has the chance to kill the man who took her father's name. Whether Moll will ever come to see Book as the "only family" she has left, the way Book sees her, remains to be seen.

Commander Rayner Got The Best Out Of USS Discovery's Crew

Citrus mash for everyone!

Captain Burnham left Commander Rayner at the conn of the USS Discovery while she and Book went on their away mission, despite Rayner's reservations about leading Burnham's crew. However, Rayner was impressed that Burnhum learned Kellerun literature to connect with her new First Officer. This knowledge was the key to Rayner saving Burnham from interdimensional space. Burnham used the ISS Enterprise's tractor beam to send a signal the Kellerun commander would understand.

Rayner gained a new appreciation for Discovery's crew and how to work with them as his own crew.

Commander Rayner placed his trust in the USS Discovery's crew to "science" a way to open the wormhole's aperture and pull the ISS Enterprise into the Prime Universe. Commander Paul Stamets (Anthony Rapp). Lt. Sylvia Tilly (Mary Wiseman), Ensign Adira Tal (Blu del Barrio), Lt. Commander Gen Rhys (Patrick Kwok-Choon), Lt. Christopher (Orville Cummings), Lt. Linus (David Benjamin Tomlinson), Lt. Naya (Victoria Sawal), Lt. Commander Asha (Christina Dixon), and Lt. Gallo (Natalie Liconti) all rose to the occasion and found a way to save Burnham and Book. In turn, Rayner gained a new appreciation for Discovery's crew and how to work with them as his own crew.

Dr. Culber Reaches Out To Tilly

Culber has questions science can't answer

The USS Discovery's counselor, Dr. Hugh Culber (Wilson Cruz), needs a counselor of his own. Culber continues to deal with the unimaginable experience of Trill scientist Jinaal Bix occupying his mind and body in Star Trek: Discovery season 5, episode 3, "Jinaal." Being taken over by a Trill has left Culber with existential questions, and he hopes finding the Progenitors' technology will provide him with the answers he seeks.

Hugh finds a sympathetic ear in Lt. Sylvia Tilly.

Unfortunately for Hugh, he doesn't believe he can share his feelings with his husband, Commander Paul Stamets because Paul is a man of science, and Culber's questions are ineffable. Hugh finds a sympathetic ear in Lt. Sylvia Tilly, but the answers Dr. Culber seeks are tied to what the USS Discovery finds when they locate the Progenitors' treasure - or so Hugh hopes. Culber, who has already died and been resurrected, may find himself in a new scenario that has pivotal life-or-death decisions in Star Trek: Discovery season 5.

Dr. Hugh Culber's dilemma in Star Trek: Discovery season 5 is a rare attempt by Star Trek to address spiritual questions.

Where Star Trek: Discovery's Next Progenitors' Treasure Clue Leads

The next clue involves water

Captain Burnham acquired the third clue from Moll and L'ak, which is a vial of water contained within a piece of the Progenitors' treasure map. Burnham is waiting for Commander Stamets to conduct a chemical analysis of the water, which will reveal where the USS Discovery must go next for the 4th clue. However, Michael told Book that Dr. Cho, the former Terran scientist who became a Starfleet Admiral, went back to the ISS Enterprise in interdimensional space and hid her clue to the Progenitors' technology there.

Michael also told Book she saw him in the past during Star Trek: Discovery season 5, episode 4, "Face the Strange's" time loops, and that they were happy back then.

Burnham and Book mused over the lessons attached to each clue. On Trill, finding Jinaal's clue was dependent on Burnham and Booker proving they value lifeforms other than their own. On Lyrek for the first clue, the lesson was the importance of cultural context. Michael surmised that the lesson Dr. Cho left behind with her clue on the ISS Enterprise was to have the hope to shape your own future in Star Trek: Discovery season 5 as the search for the Progenitors' treasure and the answers to life, itself, continues.

New episodes of Star Trek: Discovery season 5 stream Thursdays on Paramount+