A

rgolos, a war-ravaged and radiation-poisoned planet, has survived by becoming both an indoor recreation resort and a focal point for interplanetary understanding. However, bookings are down, and someone has recently sabotaged the tachyon generator that produces the main recreational activities, causing a horrific death to one of the tourists. With no identity cards on them, the Doctor and Romana fall under suspicion, but there's a third intruder whom no one's yet discovered.

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