12x07 The Ark in Space, Part Three
First Aired: Feb. 08, 1975 on BBC One
Summary: Deep space, the distant future: following Earth's devastation by solar flares, the survivors of mankind are in cryogenic suspension aboard the Nerva Beacon space station. The Doctor, Sarah and Harry arrive on board just as the menace of the insectoid Wirrn becomes apparent...
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Guest Stars[no credits found]