After finding (or re-finding) a coordinate cube in the TARDIS library, The Fourth Doctor and Romana land on the mysterious planet Rome. The doctor notices a problem, the citizens of Rome are perfect... Too perfect. Investigating further the doctor finds they all worship the god Jupiter who as it turns out is a ship's computer that crashed centuries before; shaping the course of the planet for centuries. Now the planet Rome has what it has been waiting for.. A TARDIS. The computer sets into course its true plan... To conquer all of time and space. But something is wrong, Romana seems to agree with this idea. it seems she has spent her early life helping this planet become what it was. The doctor is about to find out something that he never wanted to... All roads, past and future, do indeed lead to Rome