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Classic Who S12 • Serial 2 · (4 episodes)

The Ark in Space

3.84/ 5 354 votes

First aired Saturday, January 25, 1975
Production Code 4C
Written by Robert Holmes
Directed by Rodney Bennett
Runtime 100 minutes
Time Travel Future
Tropes: (Potential Spoilers!) Human Colony Cryogenic Sleep
Story Arc: (Potential Spoilers!) Nerva Beacon
Locations Nerva Beacon
Synopsis

The TARDIS lands on a space station orbiting Earth in the distant future. It's seemingly deserted, but the Doctor, Sarah and Harry soon discover that they are not alone. Thousands of humans are in cryogenic sleep, and while they've slept their Ark has been invaded. A parasitic insect race, the Wirrn, have taken control and threaten the very future of mankind.

4 Episodes:

First aired Saturday, January 25, 1975
Runtime 25 minutes
Written by Robert Holmes
Directed by Rodney Bennett
UK Viewers 9.4 million

Synopsis

The Doctor's attempt to give Harry a trip in the TARDIS sees the two of them and Sarah Jane arriving onboard a space station in the far future, with some rather deadly security mechanisms.

First aired Saturday, February 1, 1975
Runtime 25 minutes
Written by Robert Holmes
Directed by Rodney Bennett
UK Viewers 13.6 million

Synopsis

The Doctor and Harry revive the Ark's medtech, Vira, to help Sarah Jane. But when station commander Noah is revived, he becomes suspicious of the newcomers.

First aired Saturday, February 8, 1975
Runtime 25 minutes
Written by Robert Holmes
Directed by Rodney Bennett
UK Viewers 11.2 million

Synopsis

Knowing that Noah has been infected by the Wirrn, the Doctor persuades Vira to halt the reviving of her people, knowing it will place them in danger as well.

First aired Saturday, February 15, 1975
Runtime 25 minutes
Written by Robert Holmes
Directed by Rodney Bennett
UK Viewers 10.2 million

Synopsis

The Doctor tries to protect the humans still in cryogenic suspension from the Wirrn, who are determined to use Earth as their new breeding ground.

Ratings are from TARDIS Guide members only.

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Other adaptations of this story: