Miasimia Goria
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Miasimia Goria was a planet ruled over by the Rani, a renegade Time Lord and brilliant scientist. The people enslaved under her, Miasimia Goria's inhabitants, became restless and aggressive as a result of her experiments. She then travelled to Earth to extract chemicals out of human brains for her experimentation. (DW: The Mark of the Rani)