Last updated 24 March 2024


Part Twelve

Series Episode Number: 651

World 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


Production Team hide uncredited
WriterPip Baker
WriterJane Baker
DirectorChris Clough
ProducerJohn Nathan-Turner
DesignerDinah Walker
Costume DesignerAndrew Rose
Make-up DesignerShaunna Harrison
Studio LightingDon Babbage
Studio SoundBrian Clark
Vision MixerShirley Coward
Videotape EditorHugh Parson
Technical CoordinatorAlan Arbuthnott
Camera SupervisorAlec Wheal
Visual Effects DesignerKevin Molloy
Video EffectsDanny Popkin
Production AssistantJane Wellesley
Assistant Floor ManagerKaren Little
Production ManagerIan Fraser
Production AssociateJune Collins
Production AssociateJenny Doe
Incidental MusicMalcolm Clarke
Special SoundDick Mills
Special Sound BBC Radiophonic Workshop
Title MusicRon Grainer (uncredited)
Script EditorJohn Nathan-Turner (uncredited)
Title Music ArrangerDominic Glynn (uncredited)
Title SequenceSid Sutton (uncredited)
Title SequenceTerry Handley (uncredited)