Summary:
In the conclusion of the four-part story "The Ark in Space," the Doctor (Tom Baker) and his friends struggle to save the last remaining vestiges of Mankind from being devoured and absorbed by the insectasoid Wirrrns. But will the Doctor's efforts spell the doom for the Nerva Beacon space station? The conclusion of this episode neatly segues into the next Doctor Who continu... Full Summary >>

Cast:
Tom Baker - (The Doctor)
Elisabeth Sladen - (Sarah Jane Smith)
Ian Marter - (Harry Sullivan)
Wendy Williams - (Vira)
Kenton Moore - (Noah (Lasar))
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