Part Four
Series Episode Number: 359World Premiere: Sat 5 Jan 1974 - 5:29pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 27 Nov 2014 - 8:30pm EST [Retro TV]
Running Time: 24 minutes 57 seconds
10.60 Million (UK)
Appreciation Index: 60 (UK)Chart Position: 22 () (UK)
Recorded on Tue 12 Jun 1973 in TC1
Archive State: PAL 2 VT
As the repairs to Linx's spaceship are completed and he prepares to take off, the Doctor races to save the captured scientists and to prevent the course of history being changed.
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