Episode Three
Series Episode Number: 314World Premiere: Sat 11 Mar 1972 - 5:49pm GMT [BBC One] (United Kingdom)
First Broadcast: Wed 19 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 5 seconds
8.30 Million (UK)
Chart Position: 45 () (UK)
Recorded on Mon 29 Nov 1971 in TC8
Archive State: RSC conver
Jo attempts to rescue the Doctor who is being held prisoner by the Master and Trenchard. The Master plans to summon the Sea Devils from beneath the waves.
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