Part Four
Series Episode Number: 503World Premiere: Sat 10 Feb 1979 - 6:27pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 4 Oct 1981 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 25 minutes 9 seconds
8.60 Million (UK)
Chart Position: 60 () (UK)
Recorded on Wed 22 Nov 1978 in Television Centre 3
With the Marshal poised to fire upon Zeos and the Mentalis computer on a countdown to destruction, the Doctor resorts to desperate measures to prevent a cataclysm.
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