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.
| Characters include uncredited | ||
|---|---|---|
| Doctor Who |  | Tom Baker |
| Leela |  | Louise Jameson |
| Tomas |  | Brendan Price |
| Calib |  | Leslie Schofield |
| Neeva |  | David Garfield |
| Jabel |  | Leon Eagles |
| Gentek |  | Mike Elles |
| Acolyte |  | Peter Baldock |
| Xoanon |  | Roy Herrick |
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