The Doctor, Steven, and Dodo arrive on a planet with an advanced civilization living in a city and a group of people living in caves outside the city who everyone keeps calling "savages." How have the advanced people become so advanced? They capture the "savages" and steal their life energy. You know the Doctor has to put an end to this.
This is Steven's last episode! He stays behind to mediate between the two groups. Now if we could get rid of Dodo...
Companions: Steven, Dodo
Episode: #26, "The Savages," four parts
Adversary: the Elders
Classic Lines: the Doctor, to one of the Elders: "Oppose you? Indeed I am going to oppose you, just in the same way that I oppose the Daleks or any other menace to common humanity."
Tuck This Away to Impress Your Friends: This is the first Doctor Who serial in which the individual episodes didn't have names. They're "Episode 1," "Episode 2," etc.
Next Up: "The War Machines"