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?

Genres

Cast

Patrick Troughton

The Doctor

Frazer Hines

Jamie McCrimmon

Deborah Watling

Victoria Waterfield

Victor Maddern

Robson

John Abineri

Van Lutyens

Margaret John

Megan Jones