Part Four
Series Episode Number: 569World Premiere: Tue 23 Feb 1982 - 7:05pm GMT [BBC One: Not Wales] (United Kingdom)
First Broadcast: Fri 17 Apr 2015 - 8:30pm EDT [Retro TV]
Running Time: 23 minutes 32 seconds
10.10 Million (UK)
Chart Position: 40 () (UK)
Recorded on Thu 04 Jun 1981 in Television Centre 6
The Doctor discovers more Terileptil criminals in hiding in London. As he battles them, their soliton gas generator explodes, setting the city ablaze...
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