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. 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.