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The Doctor and UNIT investigate a deadly infection lurking underneath the Welsh mining town of Llanfairfach. It's an adventure that will change Jo Grant's life forever...
Character :The Doctor
Character :Jo Grant
Character :Brigadier Lethbridge-Stewart
Character :Sergeant Benton
Character :Captain Mike Yates
Character :Cliff Jones
Character :Stevens
Character :Elgin
Character :Hinks
Character :Dai Evans
Character :Dave
Character :Bert
Character :Nancy
Character :Milkman
Character :Hughes
Character :Fell
Character :BOSS (voice)
Character :Minister of Ecology
Character :Cleaner
Character :Yates' Guard
Character :Guard
Character :James
