State of Decay is the fourth serial of the 18th season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 22 November to 13 December 1980.
After the events of Full Circle, the Fourth Doctor, Romana, K9, and TARDIS stowaway Adric arrive on a planet with a feudal society whose inhabitants live under the thrall of three lords—Zargo, Camilla, and Aukon—who dwell in a shadowy Tower. The Doctor and Romana discover evidence of advanced technology and wonder what happened to cause the planet to devolve to its current “state of decay”.
After being taken prisoner by the three lords, The Doctor and Romana discover that the great Tower in which the Lords dwell is a spaceship called Hydrax, originally from Earth. The three lords are members of the original crew, mutated into vampires, while the subjects beneath them are the descendants of the other colonists, made dull and primitive by generations of breeding and oppression.
A rebel called Tarak infiltrates the Tower, freeing the Doctor and Romana. The Doctor returns to the TARDIS, while Romana stays with Tarak to search for Adric. They find Adric in a state of trance. Zargo and Camilla attack them, but Aukon compels them to stop. He wants Adric as a Chosen One and Romana, a Time Lord, for sacrifice at the Arising, the first taste of revenge for their master, the “Great One.”
In the TARDIS the Doctor discovers that the Great Vampires could only be defeated using specially designed ships which fired steel bolts that speared the monsters through the heart. Deep within the tower, he finds the last Great Vampire, about to be revived. The Doctor rigs one of the spaceship’s old scout ships to launch and fall back toward the ground, driving itself into the heart of the subterranean Great One. With the Great One dispatched, the three vampire Lords crumble to dust.
The Doctor finds Romana and Adric and they leave the planet, hoping it will develop once again toward its former advanced state.
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To view the list of other Doctor Who serials, please click this link
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