Part One
Series Episode Number: 546World Premiere: Sat 31 Jan 1981 - 5:09pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 20 Dec 1981 - 11:00pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 5 seconds
7.60 Million (UK)
Chart Position: 72 () (UK)
Recorded on Wed 05 Nov 1980 in Television Centre 6
The Keeper of Traken is nearing the end of his long reign. Fearing a terrible evil is about to threaten the peace and harmony of his world, he requests the Doctor's help.
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