Part Twelve
Series Episode Number: 651World Premiere: Sat 22 Nov 1986 - 5:45pm GMT [BBC One] (United Kingdom)
First Broadcast: Tue 16 Jun 2015 - 8:30pm EDT [Retro TV]
Running Time: 24 minutes 45 seconds
5.20 Million (UK)
Appreciation Index: 69 (UK)Chart Position: 89 () (UK)
Recorded on Thu 31 Jul 1986 in Television Centre 3
The Doctor realises that if he can speed up the Vervoids life span with light, they will decay. Using vionesium, he does so, unwittingly causing genocide in the process
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