A mysterious death at a coal mine at Llanfairfach in South Wales sees UNIT's Jo Grant and Brigadier Lethbridge-Stewart arrive, with the Doctor in tow. The poor miner is discovered to be glowing bright green.
Is it possible that pollusion from the nearby Global Chemicals facility is to blame? Could they be responsible for the appearance of giant deadly maggots?
This adventure is much more than any other of the stories during the Jon Pertwee era, there is quite a clear environmental message underlying this adventure. The story is also the last to feature Katy Manning as Jo Grant.
This story is one of Jon Pertwee's finest, and is also notable for having him dressed up. Once as a milkman, and when he pretends to be a woman, in a lovely visual gag with Captain Mike Yates.
Get set to play your DVD or VHS at 7.30pm tonight. Join us from 7pm, when we'll be watching one of Pertwee's best.