Asha Qureshi

Asha Qureshi auditioned for the role of the Eighth Doctor's companion while posing as a human. (BFA: Situation Vacant)

She was actually Lantis from the planet Imafiya, on a research mission when she was separated from her companions. She has been stranded on Earth since 1995, having been unable to repair her broken recall device due to the comparatively primitive nature of human technology.