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Terran EmpireSylvia Tilly
Sylvia Tilly (mirror).png
Military Rank:
Critter Rank 4 icon.png
I.S.S. Discovery
Voiced by:
Mary Wiseman
Disambig icon.png For for her DSC Starfleet counterpart, see Sylvia Tilly.

Captain Sylvia Tilly (also known as "Captain Killy") is a Terran Captain and the Mirror Universe counterpart of Cadet Sylvia Tilly. In 2256, Tilly was in command of the I.S.S. Discovery. When the U.S.S. Discovery jumped into the Mirror universe using the spore hub drive, Tilly, her ship and her crew were thrown into the 25th century of the Prime universe where she remains at large.


Similar to her Prime universe counterpart, Sylvia Tilly was aboard a Malachowski-class vessel during a training cruise when the ship's captain was killed. Tilly took the opportunity of the created vacuum in leadership to seize command of the ship. She also killed the ship's First Officer (a Mirror universe counterpart of the player). According to other Terran captains such as Evelyn Savea, Tilly murdered the First Officer with a spoon. ( “Pahvo Dissension”) According to Tilly herself, the death was swift and painless. ( “Para Pacem”) However, it is revealed that Tilly, claiming to have killed the player’s mirror self, was lying as they appear onboard the I.S.S. Reskava in 2411. ( “Firewall”)

Some time later, she would take command of the I.S.S. Discovery while the previous captain was in bed with the flu. (Despite Yourself) In her career, she participated in attacks on Betazed and Mintaka III with Emperor Georgiou. Her reputation earned her various nicknames, including "The Slayer of Sorna Prime," "The Witch of Wurna Minor," and "Captain Killy." (Will You Take My Hand?, Despite Yourself)

In 2256 the I.S.S. Discovery was ordered to Pahvo, which was considered a de facto death sentence due to the deadly nature of the planet. Before she could be attacked by Pahvo, she came under attack from a large Klingon fleet. During the battle, the U.S.S. Discovery jumped to the Mirror universe, switching places with the I.S.S. Discovery. I.S.S. Discovery, as well as the rest of the Klingon fleet, ended up in the Prime universe at Pahvo in 2410. ( “Para Pacem”, The War Without, The War Within)

Upon their arrival, an Alliance vessel was present in orbit of the planet. Tilly enlisted ship's aid by claiming asylum and used them to fight off the Klingon attackers as well as her own mutineers who objected to seeking aid from the Alliance. During the ensuing battle with Klingon forces, Tilly beamed down to Pahvo and managed to manipulate it with agonizer technology into aiding her. Having turned the planet into a weapon under her control she destroyed the Klingon attackers and damaged the Alliance ship, giving them a warning to stay away and stating her intent to use Pahvo to create a new empire under her control. ( “Para Pacem”)

The Alliance vessel eventually returned to the planet and its crew managed to disable the agonizer technology. However, Tilly managed to escape using the planet's transmitter as a long range transporter. Her crew, having been abandoned by her, agreed to return to the 23rd century where they would eventually be destroyed by Klingon forces. The remnants of the I.S.S. Discovery would be mistaken by Starfleet as wreckage of the U.S.S. Discovery. ( “Illusion of Communication”, The War Without, The War Within)

Missions involved[]

Other involvement[]

  • “Pahvo Dissension”: She is mentioned in the lore and Terran Captain will sometimes mention her in the slurs addressed to the players.



External links[]

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Terran Empire
Faction Terran Empire.png
Details Terran EmpireImperial Starfleet • TerranMirror Universe • Badlands • Badlands Battlezone • Bajor • Empok Nor • Terok Nor • Klingon Alliance Base • Terran Empire Base • Terran Task Force
Ground Forces Mirror Chief • Terran Ensign Engineering Officer • Terran Ensign Medic • Terran Ensign Tactical Officer • Terran Lieutenant Engineering Officer • Terran Lieutenant Medic • Terran Lieutenant Tactical Officer
Starships Mobius Temporal Destroyer • Temporal Dreadnought • Terran Armitage Class Escort Carrier • Terran Chimera Heavy Destroyer • Terran Command Cruiser • Terran Cruiser • Terran Danube Runabout • Terran Escort • Terran Frigate • Terran Galaxy Class Cruiser • Terran Galaxy Dreadnought Cruiser • Terran Intrepid Class Science Vessel • Terran Multi-Mission Explorer • Terran Nebula Class Science Vessel • Terran Odyssey Dreadnought Cruiser • Terran Peregrine Fighter • Terran Prometheus Class Escort • Terran Rhode Island Science Vessel • Terran Science Vessel
NPCs Emperor • Leeta • Sylvia Tilly • Amna Patel • Rathmon • Gabriel Lorca • Player character
NPC starships I.S.S. Armitage • I.S.S. Battleship • I.S.S. Centaur • I.S.S. Cerberus • I.S.S. Charon • I.S.S. Dakota (Frigate) • I.S.S. Dakota (Cruiser) • I.S.S. Delaware • I.S.S. Devron • I.S.S. Discovery • I.S.S. Emissary • I.S.S. Enterprise • I.S.S. Excelsior • I.S.S. Exeter • I.S.S. Fortuna • I.S.S. Galaxy • I.S.S. Hermes • I.S.S. Hydaspes • I.S.S. Jupiter • I.S.S. Kirk • I.S.S. Liebig • I.S.S. London • I.S.S. Luna • I.S.S. Miranda • I.S.S. Molly • I.S.S. Monterey • I.S.S. Nova • I.S.S. O'Brien • I.S.S. Odyssey • I.S.S. Olympus • I.S.S. Quantum • I.S.S. Saber • I.S.S. Sato • I.S.S. ShiKahr • I.S.S. Sisko • I.S.S. Sovereign • I.S.S. Spock • I.S.S. Stadi • I.S.S. Star Treader • I.S.S. Trident • I.S.S. Typhoon • I.S.S. Venture • I.S.S. Vistula

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Kelvin Timeline: 0718
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Star Trek cast reprising their roles
René AuberjonoisLeVar BurtonMary ChieffoJeffrey CombsDenise CrosbyMichael DornAron EisenbergJoseph GattMax GrodénchikJ.G. HertzlerJason IsaacsSalome JensWalter KoenigLisa LoCiceroChase MastersonRobert Duncan McNeillLeonard NimoyRobert O'ReillyEthan PhillipsRobert PicardoKim RhodesAndrew RobinsonBumper RobinsonTim RussJeri RyanRekha SharmaArmin ShimermanAlexander SiddigTony ToddGarrett WangMatt WinstonMary WisemanNana Visitor
See also ChronologyList of canon charactersList of canon starshipsVoice acting