The planet Peladon, some time in the future. Mining disputes threaten the peace of the planet, and as the Doctor and Jo arrive, it seems that the ghost of Aggedor walks once more...
Quest roles:
Terry Walsh(Doran (uncredited)), Gerald Taylor(Baker's Man), Stuart Fell(Roga), Rex Robinson(Dr. Carter), Donald Gee(Eckersley), Frank Gatliff(Ortron), Ralph Watson(Ben), Graeme Eton(Preba), Ysanne Churchman(Alpha Centauri (voice)), Nina Thomas(Thalira), Michael Crane(Blor)