Episode Four
Series Episode Number: 315World Premiere: Sat 18 Mar 1972 - 5:50pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 20 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 21 seconds
7.80 Million (UK)
Chart Position: 40 () (UK)
Recorded on Tue 30 Nov 1971 in TC8
Archive State: PAL 2 VT
The Doctor attempts to persuade Captain Hart of the danger that the Master represents. Eager to make contact with the Sea Devils, the Doctor journeys deep into the ocean.
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