An organism that feeds on electricity. In the mid-23rd century, a shuttle carrying Michael Burnham and three other prisoners was disabled when GS54 begins feeding on the shuttle's power system. 

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Sweeny is a writer and consulting producer on Star Trek: Discovery. His previous credits include The 4400, Medium, Common Law, Elementary and Limitless.

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Oyin Oladejo, who appeared as Lieutenant Junior Grade Joann Owosekun in the Star Trek: Discovery episode "Context Is for Kings," is a Toronto-based actress who hails from Nigeria. After graduating from Humber College`s Theatre Performance Program, Oladejo has amassed such in plays, films and shows as In This World, A Doll's House, TomorrowLove and Pond.

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Rekha Sharma, who hails from Vancouver, British Columbia, Canada, co-stars on Star Trek: Discovery as Commander Ellen Landry, the Discovery’s security officer. Sharma is perhaps most recognized for her roles as Tory Foster on Battlestar Galactica and Dr. Lorelei Tsing on The 100. Among her other film and television credits are The Outer Limits, The Core, Smallville, Aliens vs. Predator: Requiem and CSI: Crime Scene Investigation.

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Glenn NCC-1030, U.S.S.

The U.S.S. Glenn NCC-1030 was a Federation Crossfield class starship in the mid-23rd century that was researching a new, experimental organic-propulsion system along with the U.S.S. Discovery. An unexpected incident occurred during black alert manuevers testing the new propulsion system resulting in the death of the entire crew. 

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Laryngotracheal Stenosis

An abnormal narrowing of the central air passageways that can cause chronic snoring and a dry throat. Sylvia Tilly was born with the condition.

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Sara Mitich plays Lt. Commander Airiam, a synthetic-human hybrid aboard the U.S.S. Discovery, on Star Trek: Discovery. Originally from Hamilton, Ontario, Mitich's previous television and film credits include The Listener, Joy Ride 3: Road Kill, Heroes Reborn, Murdoch Mysteries, The Expanse, White Night and Anon.

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Elias Toufexis played Cold in the Star Trek: Discovery episode "Context Is for Kings." The Canadian actor has performed on stage, in films and video games, and on television, and is also both a voiceover artist and motion-capture veteran actor. His counts among his credits Decoys, Da Vinci's Inquest, Stargate: Atlantis, Smallville, Supernatural, Splinter Cell: Blacklist, Bitten, Len and Company, The Expanse and The Long Dark

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(Portrayed by Anthony Rapp)

Lt. Commander Paul Stamets is the U.S.S. Discovery’s science officer and chief engineer, and was the partner of the late Dr. Hugh Culber. Brilliant, awkward, outspoken and not keen to make friends, his expertise is astromycology, meaning he knows more than anyone about space mushrooms and the vegetative part of a fungus called mycelium. Stamets collaborated with Lt. Straal, conducting research to "get to the living heart of the universe, the veins and muscles that hold our galaxies together." However, the Federation co-opted their research at the start of the Klingon-Federation War in order to develop an organic-propulsion system. Stamets was assigned to the Discovery, while Staal was assigned to the U.S.S. Glenn in order to expedite their research. 

Captain Lorca of the Discovery saw in their research the possibility of jumping through space at unimaginable speeds. Though he professed to pushing Stamets and Staal so hard in order to defeat the Klingons, his ulterior motive was to return to the Terran Universe and overthrow Emperor Georgiou. Staal, believing he’d made progress, tested the drive, but died along with everyone else on the Glenn. Stamets forged on, impatiently working with Cadet Tilly. Eventually, they harnessed the spore drive, with Stamets plugging into it as an organic navigator. The drive worked, and Lorca took advantage of it, giving the Klingons a run for their money and getting closer to home.

However, the jumps took their toll on Stamets, leaving him catatonic, but functioning within the mycelial network. When the Discovery crossed into the Mirror Universe, Stamets and Mirror Stamets came face to face, and Stamets was able to say goodbye to Dr. Culber, who'd been killed by Ash Tyler. Tilly soon revived Stamets, who then helped destroy the I.S.S. Charon and guide the Discovery back to the Prime Universe. 

For his efforts, Stamets received the Starfleet Medal of Honor and a promotion to Lt. Commander. He also accepted the Starfleet Medal of Honor on Dr. Culber’s behalf.

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A Starfleet prisoner in the mid-23rd century that was being transported to Tellum along with Michael Burnham and two other prisoners when their shuttle was intercepted by the U.S.S. Discovery

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Prototaxites Stellaviatori

A fungal species used by Paul Stamets for mycelium spores.

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(Portrayed by Christopher Russell).

A communications officer on the U.S.S. Discovery.


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An astromycologist conducting research with Paul Stamets to "get to the living heart of the universe. The veins and muscles that hold our galaxies together." The Federation co-opted their research at the start of the Klingon-Federation War in order to develop an organic-propulsion system. Staal was assigned to the U.S.S. Glenn as a Science Officer while Stamets was assigned to the U.S.S. Discovery to expedite their research. Straal was killed, along with the entire crew of the U.S.S. Glenn, during black alert manuevers testing the new propulsion system.

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The name given by Michael Burnham to the tardigrade found on the U.S.S. Glenn following the ship's failed propulsion experiment. Ripper was beamed aboard the U.S.S. Discovery by Captain Lorca in the hopes the creature could offer a tactical advantage in the war against the Klingon Empire.

Commander Landry was killed by Ripper while trying to expedite its analysis. Later, Burnham would correctly hypothesize that Ripper was the solution to the organic-propulsion drive experiment.  

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Jason Isaacs plays Captain Gabriel Lorca, captain of the U.S.S. Discovery, on Star Trek: Discovery. The veteran British actor’s career spans nearly 30 years and counting, and his credits include Capitol City, Event Horizon, The Patriot, several Harry Potter films (in which he portrayed Lucius Malfoy, the father of Draco Malfoy), Awake, the Rosemary’s Baby miniseries with Zoe Saldana, Dig and Star Wars Rebels.

Isaacs' current and upcoming projects include The OA, London Fields, Behind the Glass, The Death of Stalin and Hotel Mumbai.

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Grace Lynn Kung played the prisoner Psycho in the Star Trek: Discovery episode, "Context Is for Kings." A Canadian actress who splits her time between North America and the U.K., Kung counts among her film and television credits Blue State, House Party, Degrassi: The Next Generation, The Strain, Miss Sloane, Mary Kills People, Designated Survivor, Cult of Chucky, Carmilla and Fahrenheit 451

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(Portrayed by Sara Mitich).

A Lieutenant Commander and synthetic-human hybrid on the U.S.S. Discovery,

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Mary Wiseman stars on Star Trek: Discovery as Sylvia Tilly, a Starfleet Academy cadet in her final year of study, assigned to the U.S.S. Discovery.

The young actress, who studied at Juilliard, counts among her credits episodes of such TV series as The Characters, Difficult People, Longmire and Baskets. Her stage work includes an off-Broadway production of The Octoroon, as well as her 2015 Broadway debut in Therese Raquin and a 2017 production of The Skin of Our Teeth at the Theater for a New Audience in Brooklyn, New York.

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A popular fruit found on Earth. It was a favorite of Saru.

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Rowe Jr.

Toronto native Ronnie Rowe played a Shuttle Pilot in the Star Trek: Discovery episode "Context Is for Kings" and a communications specialist in "Magic to Make the Sanest Man Go Mad." His prior credits include Warehouse 13, Saving Hope, Dark Matter, The Expanse and the film, Black Cop.

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