After the events of the Key to Time, the Doctor installs a Randomiser into the TARDIS to elude the evil Black Guardian.
The Doctor and Romana arrive on a rocky desolate planet, and the Doctor makes a horrifying discovery. The planet is Skaro the homeworld of the Daleks. They soon discover that the Daleks are using explosives to unearth something hidden beneath the surface of the planet, but what could it be?
Locked in a battle against the funky Movellans for two hundred years, the only way that the Daleks can overcome the Movellans is to resurrect their long dead creator: Davros!
This story was the final time that Terry Nation, the creator of the Daleks wrote for Doctor Who, because Douglas Adams almost completely rewrote his script. There are even a few references to his novel The Hitch-hikers guide to the Galaxy.
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