The TARDIS brings the Doctor, Jamie and Victoria to the present-day North Sea coast. Something nasty is lurking in the gas pipelines of the North Sea, and before long the nearby refinery is under attack. The Doctor discovers that a form of living seaweed is at work, and that a number of the base personnel have been possessed. Can he and his friends work in time to prevent an entire take-over of Earth?
Directed by Hugh David
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Cast
Patrick Troughton
The Doctor
Frazer Hines
Jamie McCrimmon
Deborah Watling
Victoria Waterfield
Victor Maddern
Robson
Roy Spencer
Frank Harris
June Murphy
Maggie Harris
John Abineri
Van Lutyens
John Garvin
Carney
Hubert Rees
Chief Engineer
Graham Leaman
Price
Richard Mayes
Chief Baxter
Margaret John
Megan Jones
Brian Cullingford
Perkins
Bill Burridge
Mr. Quill
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