22 November 1980
Emrys James (Aukon), Rachel Davies (Camilla), William Lindsay (Zargo), Clinton Greyn (Ivo), Rhoda Lewis (Marta) [1-2], Thane Bettany (Tarak), Iain Rattray (Habris) [1-2, 4], Arthur Hewlett (Kalmar), Stacy Davies (Veros), Dean Allen (Karl) , Stuart Fell (Roga) , Stuart Blake (Zoldaz) .
|Written by||Terrence Dicks|
|Directed by||Peter Moffatt|
|Produced by||John Nathan Turner|
Searching for a way out of E-Space, The Doctor and Romana, joined by a young stowaway, land on a planet eerily similar to Medieval Earth. Its people live in fear, under the thumb of the Three Who Rule, cruel lords who suppress all learning to keep their subjects ignorant and helpless.
The Doctor falls in with a group of rebels and discovers a cache of advanced technology banned by the Three Who Rule. But who are these ruthless monarchs? Meeting the lords and exploring their tower, he and Romana uncover a chilling secret. The Doctor realises an ancient evil is rising once again, a terrible threat to the universe fought by his own race long ago, and one that only he can destroy now.