Podsighil

 was Venusian and the sister of Vivojkhil. When the First Doctor landed in the TARDIS on the Sou(ou)shi ship, he found the infant Podsighil and her older sister Vivojkhil onboard. Podsighil had seen Barbara earlier, and led the Doctor to her, thus enabling him to free his companion. (PROSE: Venusian Lullaby)