Ia Jareshth was a Lacaillan. The other half of her pair was Myn Jareshth.

She was part of Isaac Summerfield's group in the late 20th century that helped stranded aliens get off the Earth. Captured by the military after the Seventh Doctor's arrival in 1983, Ellen Woodworth killed and dissected her and two Caxtarids. (PROSE: Return of the Living Dad)

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