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