The Doctor and Ace head for the Psychic Circus on the planet Segonax, where they meet a disparate group of fellow visitors including a pompous explorer named Captain Cook and his companion Mags and a biker known as Nord.

The Circus itself is dominated by the sinister Chief Clown and his deadly troupe of robot clowns, who organise a talent contest in which all visitors take part. However, the audience consists of just a single strange family - mother, father and daughter - seated at the ringside.

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