The TARDIS arrives on the planet Terra Alpha where the Doctor and Ace discover a society in which sadness is against the law - a law enforced with considerable zeal by the brightly uniformed Happiness Patrol. The planet is ruled over by Helen A with the aid of her companion Joseph C and her carnivorous pet Stigorax named Fifi.

The penalty for those found guilty of unhappiness is death in a stream of molten candy prepared by Helen A's executioner, the robotic Kandyman.

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