Cast
- Tom Baker (The Doctor)
- Louise Jameson (Leela)
- Geoffrey Beevers (The Master)
- Michael Keating (Calvert)
- Gareth Armstrong (Arthley / Salonu Prime)
- Nicholas Briggs (The Salonu / Andor / Auto-Announcer)
Doctor Who - The Fourth Doctor Adventures
3.4. Doctor Who: The Evil One
Written by Nicholas Briggs
Starring Tom Baker Louise Jameson
