Credits
- The Doctor
- Colin Baker
- Melanie
- Bonnie Langford
- The Inquisitor
- Lynda Bellingham
- The Valeyard
- Michael Jayston
- Professor Lasky
- Honor Blackman
- Director
- Chris Clough
- Producer
- John Nathan-Turner
- Writer
- Jane Baker
- Writer
- Pip Baker
Doctor Who, Season 23 Episode 12 of 14
Duration: 25 minutes
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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