Eight slash Q Panenka, a craggy comet with a 13km circumference, has an elliptical orbit that takes it between Earth and Jupiter. Which, in the year 2329, makes it a cheap means of space freight — the second class postal service of the solar system.
But when the TARDIS lands on Panenka, the Doctor, Tegan, Turlough and Nyssa discover a community falling apart at the seams — plagued by thefts, and mysterious disappearances among the "piggybackers" who eke out a desperate existence on the comet.
While Tegan and Nyssa suit up for a dangerous excursion into the comet's Unstable Zone, the Doctor and Turlough find themselves pawns in a game that could lead to tragedy for both Earth and Jupiter alike…
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