Part Four
Series Episode Number: 443World Premiere: Sat 22 Jan 1977 - 6:26pm GMT [BBC One] (United Kingdom)
First Broadcast: Mon 26 May 1980 - 5:30pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 46 seconds
11.70 Million (UK)
Appreciation Index: 60 (UK)Chart Position: 19 () (UK)
Recorded on Tue 26 Oct 1976 in TC3
BBC Genome Project: see entry
Determined to rectify his earlier mistake, the Doctor tries to repair Xoanon. But the insane computer refuses to accept his help and prepares to destroy the entire planet.
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