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Jevvan Petrovna Adrea was a member of the cable maintenance crew. She moaned about the state of the cables to Gerium and Tin-Marie Fisher. She ran a diagnostic when the power failed and met the Seventh Doctor in the tunnels when she was looking for Tin-Marie. She disliked the termites and saw that the termites were moving the city.
She used the technology in the TARDIS to help the Seventh Doctor to defeat Our Mother. (Valhalla)