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.