Troughton is the best Dr and this is an entertaining 5 parter that shows Troughton off as a mixed bag of fun and fear.
The story sees dastardly dominators who aim to destroy a planet with a nuclear bomb in order to fuel their star fleet.
The Doctor, with Jamie and new recruit Zoe manage to thwart their plans but not without a great deal of team work and action. With Jamie out and about exploding Quarks the Dominators is an entertaining tale to the end.
The tale is a relatively simple one, a spacecraft lands accidentally on a planet thought to be uninhabited. The lifeforms, Dominators, are in need of an unknown fuel source with the aid of the robot QUARKS and that would be that except for the fact that the planet is not uninhabited, there are humanoids who are a peace loving race in the aftermath of an atomic debacle and then there is the Doctor, Jamie and Zoe.
To all intents and purposes it is a standard story of peace versus war with the Doctor forced tom act to free the Dulcians from evil and oppression. Nothing is quite so simple. The Dominators are cast as evil but in fact there is a trainee, a cold blooded, rash killer of everything he sees. His mentor, although a believer of the mental and physical superiority of the Dominators, is a different creature with a more 'noble' purpose. His consideration for life is more of a calculation than an emotional atttachment and the quest for domination of the universe is to bring order to all things. The destruction of the Dominators is more of a tragedy to be mourned rather than a triumph of good over evil.
The Dulcians are foppish and cowardly unlike the Thals of the Dead Planet and do not have the stomach to fight even for themselves. Science has resulted in an indifference to real new knowledge and has been replaced with a Disneyesque view of the world.
Patrick Troughton is admirable throughout and Zoe, despite the high intellect for which she is renowned as a Doctor companion, is again more of a visual aspect rather than a contributor. The story could have done with some tougher editing too.