Doctor Who: Season 21, Episode 18
The Caves of Androzani: Part Two (9 Mar. 1984)
Having been saved from execution by Sharez Jek and his androids, Jek takes a shine to Peri, and wants her with him forever. Salateen tells the Dr and Peri that they are dying from Spectrox toxemia, but there is an antidote.
Writer:Robert Holmes (by)