Doctor Who: Green Death Special Edition

UNIT is called in after a miner from the Welsh village of Llanfairfach is found dead, his skin glowing bright green. Jo joins forces with a local environmental group, led by Professor Clifford Jones, while the Doctor investigates the nearby plant of a company called Global Chemicals. They discover that the mine workings are full of giant maggots and green slime - both lethal to touch - that have been produced by chemical waste pumped from the Global plant.