Part Three
Series Episode Number: 528World Premiere: Sat 13 Sep 1980 - 5:57pm BST [BBC One] (United Kingdom)
First Broadcast: Tue 24 Mar 2015 - 8:00pm EDT [Retro TV]
Running Time: 21 minutes 21 seconds
5.00 Million (UK)
Chart Position: 111 () (UK)
Recorded on Fri 18 Apr 1980 in Television Centre 3
The Tachyon Generator has aged the Doctor into a white haired old man, but he discovers the truth behind the machine and uncovers a plot to take control of the Hive.
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