It is followed by the classic storyline Spearhead from Space. In the story, a swarm of meteorites fall on the sleepy English countryside, bringing with them a terrible new threat to mankind: the Nestene consciousness - a disembodied alien intelligence with an affinity for plastic. The Doctor is forced to race against time, in order to stop humanity from being replaced by a generation of terrifying plastic replicas.
Doctor Who Revisited: The Third Doctor
Doctor Who Revisited: The Second Doctor
Doctor Who Revisited: The First Doctor
Doctor Who Revisited: The Second Doctor
Doctor Who Revisited: The First Doctor
Doctor Who: The Doctors Revisited – The Third Doctor premieres Sunday, March 31, 8:00pm ET/PT.