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I hope you know... You're all incredibly special to us.
— Dr. Tsing to The Delinquents [src]

Dr. Lorelei Tsing was a recurring character in the second season. She was portrayed by cast member Rekha Sharma, and debuted in the first episode of the second season. She is the secondary antagonist of season 2

Tsing was Chief Medical Officer of Mount Weather, and in charge of the Harvest Project. She used the 47 Delinquents in Mount Weather for her experiments and bone marrow extractions, in order to grant the rest of the residents immunity to radiation. When President Wallace attempted to put a stop to it, she sided with his son, Cage Wallace.

She ordered Mount Weather guards to start taking Delinquents from their room to be harvested, but the Delinquents fought back. Jasper Jordan's steadfast resistance against them led Tsing to selecting him as her next victim to be harvested. However, Bellamy Blake caused a radiation leak, killing several guards and injuring Tsing. She tried to escape by getting into an elevator, but Jasper blocked the door, and he, Monty Green, Harper McIntyre and Nathan Miller watched as Tsing died.

Throughout the Series

In The 48, she comes into the hospital section of Mount Weather and greets Clarke Griffin, who is sitting on one of the beds. She then takes Maya Vie to be decontaminated after Maya has a brief conversation with Clarke.

In Inclement Weather, she tampers with the gunshot wound on one of the guardsmen to make it look like an arrow wound just before showing Clarke the body. She later tends to Clarke's wound after she purposely reopened her stitches to get back into medical.

In Reapercussions, she is seen in the Harvest Chamber, where the Grounders are being drained of their blood, and her being there forces Clarke to hide in Anya's cage in order to keep from being spotted by her. She is also briefly seen at the end of the episode doing a Grounder check. When she comes across Lincoln, she says to take him to "The Cerberus Project".

In Human Trials, she is first seen at the quarantine room helping Maya who is suffering from severe radiation burns. When Monty and Jasper arrive, they see that Maya is in poor condition, and Jasper wants to help. Dr. Tsing tells him that a blood exchange might save her, but it can be risky. Jasper does it anyways in order to save Maya. During the procedure, Monty starts to ask Tsing questions. Though she tries to get Monty to leave the room, he stays after he catches her in the middle of a lie. After the procedure is a success and Maya is fully recovered, Tsing visits Dante Wallace and informs him that their first human trial was a success. However, this displeases him as he stated to her he did not want any tests done.

In Fog of War, she is seen alongside Cage arguing with Dante as to extracting blood from the delinquents. Dante says he will not take them forcefully, much to their displeasure. Later she is seen alongside Cage performing tests on the delinquents who volunteered to give blood to the Mountain Men.

In Long Into an Abyss, Tsing and Cage perform a test on Keenan Mykulak in order to test the blood transfusions the delinquents gave. Keenan, however, starts getting radiation burns almost instantly. Cage tries to stop it, but Tsing steps in saying that she will clearly inform everyone of what they are doing, so they allow Keenan to die. They determine that bone marrow is required in order to get the full effect from their blood, so they abduct Harper McIntyre and perform a bone marrow extraction on her.

In Coup de Grâce, she is confronted by Dante, while performing bone marrow extractions on Harper and the locked up Monty Green. He arrests her for her actions, freeing the two. Tsing says that the ground is their birthright, and they belong to be out there, but Dante disagrees and arrests her anyway.

In Rubicon, after being freed by the new president Cage, Dr. Tsing is seen entering the Delinquents room, who are now isolated in their room. She walks in telling them they need all of them to obtain their blood and starts taking them one by one. She is seen performing a bone marrow extraction on one delinquent, extracting all of his blood. Later when she is racking up the others, the delinquents start to rebel, with their plan ultimately failing. She then chooses to take Jasper to perform an operation on, with the guards dragging him out. However, Bellamy Blake causes a radiation leak, killing all the guards. Tsing attempts to escape via elevator, but Jasper holds the door open, with Jasper, Nathan, Monty and Harper watching her slowly die. As she dies, Jasper mockingly throws Tsing's own words back in her face.

In Blood Must Have Blood (Part 1), she is mentioned by Cage when he announces to the citizens of Mount Weather that before his "friend" was murdered, she found a treatment to help them get to the ground safely.


Dr. Tsing, although intelligent, is cruel and selfish. These traits of hers are shown multiple times throughout the episodes. She can also be described as a sociopath because she feels no remorse for the people she hurts or kills. Tsing is also shown to be disobedient and dishonest to her superiors.

Physical Appearance

Dr. Tsing has a brown complexion, with long black hair, brown eyes, and is of average height. 


Dante Wallace

At first, Dante Wallace and Dr. Tsing appear to be on good terms, however, their relationship appears to sour after Dante disagreed with Dr. Tsing about harvesting the 47 Delinquents and forbade her from going ahead with her trials, only accepting volunteers instead of forcing them. She goes behind Dante's back and, along with Cage Wallace, she continues with her trials until Dante discovers her disobedience and orders her to be locked up. Dante is later removed from office and taken into quarantine by Cage, allowing Dr. Tsing to continue with her trials.

Cage Wallace

Cage Wallace and Dr. Tsing have a positive relationship as they both worked together to help get the Mountain Men to the ground through the Cerberus Project and the Harvest Project, respectively. Cage and Dr. Tsing begin experimenting with the Delinquents' blood and bone marrow on Maya Vie and Keenan Mykulak, killing the latter. Dante Wallace eventually puts an end to their experiments and has Dr. Tsing arrested. After Cage overthrows Dante, he frees Dr. Tsing and allows her to continue her experiments on the Delinquents.


Season Two
Episode Appearance Status
The 48Appears
Inclement WeatherAppears
Many Happy ReturnsAbsent
Human TrialsAppears
Fog of WarAppears
Long Into an AbyssAppears
Remember MeAbsent
Survival of the FittestAppears
Coup de GrâceAppears
Bodyguard of LiesAbsent
Blood Must Have Blood (Part 1)Mentioned
Blood Must Have Blood (Part 2)Absent


Dr. Tsing (to the Delinquents): "I hope you know... You're all incredibly special to us."

Killed Victims

Notes and Trivia


See Also

The 100 Characters
Main Characters
Abigail GriffinBellamy BlakeCallie CartwigClarke GriffinEchoFinn CollinsGabriel SantiagoHope DiyozaJasper JordanJohn MurphyJordan GreenLincolnMarcus KaneMonty GreenOctavia BlakeRaven ReyesRoanSheidhedaThelonious JahaWells Jaha
Recurring Characters
AdenA.L.I.E.AnyaBecca FrancoBlythe Ann WorkmanBreeBrellBryanByrneCage WallaceCarl EmersonCassiusCharles PikeCharmaine DiyozaCillianCostaDante WallaceDavid MillerDiana SydneyEmoriEric JacksonEthan HardyFoxGeoff HardyHannah GreenHarper McIntyreHayesIlian‎IndraJacapo SinclairJadeJae WorkmanJames CrockettJosephine LightbourneJake GriffinJohn MbegeJonesKara CooperKaylee LeeKyle WickLevittLexaLorelei TsingLunaMadi GriffinMaya VieMichael VinsonMiles ShawMiranda MasonNathan MillerNelsonNiaNiylahNykoOntariPaxton McCrearyPriya DesaiRileyRoseRussell LightbourneRyker DesaiSeikuShawn GillmerShumwaySierraSimone LightbourneSterlingTitusTristanVera KaneVincent VieZoe Monroe
Minor Characters
AdriaAnkaraArtigasAtomAurora BlakeAtohlCarisCaspianCharlotteChaseChrisCillianCole McAdamsConnorCostiaCraigCuyler RidleyDaniel LeeDaxDelanoDelilah WorkmanDerekDerrickDiggsDrewFioGideonGina MartinGlen DicksonGuaraGustusJuelKeenan MykulakLaylaLeeLieutenant GracoMacallanMark and Peter ColtonMelMiss LucyMylesNygelOsiasOtanPascalPennPeri GordonQuintRedReese LemkinRichardsRivoRoma BraggRyderScottSemetSgt. LovejoyShaySiennaStevensTor LemkinToshTrinaTrisTybeWhitmanWillaZoran