Sci-Fi Adventure Drama
The Fifth Doctor, Tegan and Turlough arrive on Sea Base 4, a nuclear warhead station under the sea that has some very nasty neighbours.
Directed by
Pennant Roberts
Written by
Johnny Byrne
Peter Davison
The Doctor
Ingrid Pitt
Solow
Ian McCulloch
Nilson
Nitza Shaul
Karina
Tom Adams
Vorshak
James Coombes
Paroli
Mark Strickson
Vislor Turlough
Janet Fielding
Tegan Jovanka
Tai Ling
Seabase Crewmember
Norman Comer
Icthar
Nigel Humphreys
Bulic
Tara Ward
Preston
Martin Neil
Maddox
Stuart Blake
Scibus
Vincent Brimble
Tarpok
Christopher Farries
Sauvix

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