The Doctor and the TARDIS are abducted by Andron, a member of the time police from the far-flung future of England. Imprisoned in a stasis box with Victorian time-traveller Theophillus Tolliver, the Doctor learns that they are in New Britain which is governed by someone or something called Mar-Kom who has outlawed time travel. Subjected to trial-by-combat with a robot, the Doctor and Theo discovers that Mar-Kom is in fact a giant robot controlled by a vast computer installed in St Paul's Cathedral. With the population of Earth frozen in time, the Doctor and Theo fight to overpower the mad computer's rule before its robotic forces can stop them
