Classic British sci-fi adventure starring Tom Baker. When a body is found stashed away in the lighthouse, the Doctor concludes there is a chameleon in their midst - but who can it be? Part 3/4.

Classic British sci-fi adventure starring Tom Baker. The alien within the lighthouse reveals itself to be a Rutan scout, sent in advance of the arrival of an attacking mothership.

Classic British sci-fi adventure starring Tom Baker. The TARDIS lands on Pluto in the far-future, where the Doctor finds unexpected phenomena including a totalitarian government.

Classic British sci-fi adventure starring Tom Baker. The Doctor is incarcerated and scheduled for painful shock treatment meaning he is unable to meet the rebels' deadline to save Leela.

Classic British sci-fi adventure starring Tom Baker. A price is placed on the Doctor's head, while Leela's captors sentence her to public execution for crimes against The Company.

Classic British sci-fi adventure starring Tom Baker. The Doctor attempts to start a successful revolution while also trying to determine The Collector's true nature and motivation.

Classic British sci-fi adventure starring Tom Baker. The Doctor is dispatched on a quest by the White Guardian with a new cohort, Romana, to search for the six segments of the Key to Time.

Classic British sci-fi adventure starring Tom Baker. The Doctor and Romana investigate Garron's activities, but their involvement leads Graff to believe they are working together.

Classic British sci-fi adventure starring Tom Baker. The Doctor, Romana and Garron, who are trying to locate the six lost segments of the Key to Time, are taken prisoner by the Graff.

Classic British sci-fi adventure starring Tom Baker. The Doctor returns to keep an eye on the Graff, leaving Romana, K-9 and Garron to search for Unstoffe and the first segment.