You may be looking for Melina (Spiral Scratch).

Milena was a brief companion of the Fourth Doctor, who took her for a trip as a favour to her father, the ruler of her homeworld of Xenon. The trip went smoothly until the pair were forced to land on an asteroid, where Milena was possessed by a species known as the Zicons. The Doctor was able to expel them from her body and returned her to Xenon. (PROSE: Milena)

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