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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.
Character :The Doctor
Character :Tegan Jovanka
Character :Vislor Turlough
Character :Vorshak
Character :Nilson
Character :Solow
Character :Bulic
Character :Preston
Character :Maddox
Character :Karina
Character :Paroli
Character :Icthar
Character :Scibus
Character :Tarpok
Character :Sauvix
Character :Seabase Crewmember
