Part Four
Series Episode Number: 491World Premiere: Sat 18 Nov 1978 - 6:23pm GMT [BBC One] (United Kingdom)
First Broadcast: Fri 2 Feb 2001 - 10:30pm CST [Prairie Public Television]
Running Time: 23 minutes 7 seconds
7.60 Million (UK)
Appreciation Index: 67 (UK)Chart Position: 66 () (UK)
Recorded on Mon 17 Jul 1978 in Television Centre 3
The Doctor releases two alien justice machines from imprisonment but they sentence him to death! Meanwhile, Romana searches for clues that will reveal Vivien Fay's true identity.
| Characters include uncredited | ||
|---|---|---|
| Doctor Who |  | Tom Baker |
| Romana |  | Mary Tamm |
| Professor Rumford |  | Beatrix Lehmann |
| Vivien Fay |  | Susan Engel |
| Voice of K-9 |  | John Leeson |
| Guardian Voice |  | Gerald Cross |
| Megara Voice | | David McAlister |
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