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The Fifth Doctor, Tegan and Turlough arrive on Sea Base 4, a nuclear warhead station under the sea that has some very nasty neighbours.
Length 100 minutes
Peter Davison | Janet Fielding | Mark Strickson | Tom Adams | Ian McCulloch | Ingrid Pitt | Nigel Humphreys | Tara Ward | Martin Neil | Nitza Shaul | James Coombes | Norman Comer | Stuart Blake | Vincent Brimble | Christopher Farries | Tai Ling