The Time Lords have exiled The Doctor to planet Earth, by wiping his mind of all knowledge of piloting the TARDIS. Regardless, danger still finds its way to The Doctor, as the episode features the first appearance of the Autons (whom would later terror the Ninth and Eleventh Doctors). The Autons, controlled by the Nestene Consciousness, attempt to replace key men and women in military and government posts with their own replicas...
