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In the fourth episode of the six-part story "Fury From the Deep," a group of parasitic seaweed creatures step up their attack on an oil refinery in the North Sea. In his efforts to thwart the bad guys, the Doctor and several of his cohorts are terrorized by a huge, anthropomorphic thrashing weed. Written by Victor Pemberton, "Fury From the Deep, Episode 4" originally aired on April 6, 1968. Except for two short sequences, one of which shows the grisly demise of the character Van Lutyens (John Abineri), this episode no longer exists.