Episode Six
Series Episode Number: 317World Premiere: Sat 1 Apr 1972 - 5:51pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 24 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 25 minutes 24 seconds
8.50 Million (UK)
Chart Position: 47 () (UK)
Recorded on Tue 14 Dec 1971 in TC8
Archive State: PAL 2 VT
The Sea Devils come to the surface and attack the Naval base. The Doctor is forced to create a machine that will awaken the creatures across the entire world.
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