27 September 1980
Bill Fraser (General Grugger), Frederick Treves (Lieutenant Brotadac), Edward Underdown (Zastor), Jacqueline Hill(Lexa), Colette Gleeson (Caris), Crawford Logan (Deedrix), Christopher Owen (Earthling), Simon Shaw (Guard).
|Written by||John Flanagan & Andrew McCulloch|
|Directed by||Terence Dudley|
|Produced by||John Nathan Turner|
Zastor, Leader of the planet Tigella, rules a divided people. Savants and Deons are irrevocably opposed on one crucial issue – the Dodecahedron, mysterious source of all their power. To the Savants the Dodecahedron is a miracle of science to be studied, observed and used to benefit Tigellan civilisation.
To the Deons it is a god and not to be tampered with. When the power supply begins to fluctuate wildly the whole planet is threatened, but the Tigellans cannot agree how they should deal with the problem. Zastor welcomes the arrival of the Doctor and invites him to arbitrate, but the Deons are suspicious of the Time Lord – and perhaps rightly so.
- Jacqueline Hill, who played the First Doctor’s companion Barbara Wright makes a guest appearance as Lexa, marking the first time a companion has returned to play a role other than their original character. Brotadac is an anagram of “Bad Actor”,  an in-joke by the production team. Bill Fraser only agreed to take the role of Grugger on condition the character was allowed to kick K9. His request was granted. He later appeared in the spin-offpilot K9 and Company
- Romana knows martial arts, and has heard of the Screens of Zolfa-Thura.
- The UK press reported that Bill Fraser only took the role of Grugger so he could kick K9.
- This serial was released by the BBC on video cassette in the UK in March 2003.
- This episode was watched by 5million viewers on its original transmission.
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