A very drunk Ron Bell stumbles home, passes out in his front room and wakes to find himself being eaten alive by slugs that have come through the floor.
Bert Crossley, a butcher on the new housing estate enjoys a lunch time drink with friends Danny and Tony.
On arriving back at his shop afterwards, he discovers the meat he had left in cabinets has vanished, only a few scraps and dark patches of blood remain.
Julie Jenkins, receptionist for the council offices where Brady works, takes a message from pensioner Mrs. Fortune, complaining about her blocked drain and toilet.
Carol Wilton leaves her four-year-old son Paul in the garden to buy some bread and milk, while he sits and watches slugs eat his rabbit.
Kath Green leaves her two-year-old daughter Amanda playing with her dolls in her conservatory to buy the little girl an ice cream.
At a business lunch that day in the City Hotel, David Watson tries to secure a new contract with Edward Canning and Kenneth Riggs.
David is overcome by a terrible headache until finally blood gushes from one of his nostrils and a long white worm slithers out of it.
Bobby, also being eaten alive jumps from the bedroom window straight onto a cold frame below and is killed by a shard of glass.
Gravedigger Charlie Barnes digs up a grave during the night to rob the occupants valuables, but is eaten alive by slugs when he falls in.
The plan is for Brady and Palmer to go down into the sewer by Ron Bell's house and act as bait, luring the slugs into a central chamber, while Foley waits above ground and releases the poison.
Brady and Palmer climb into Ron Bell's house through a broken window and go down into the cellar where they find hundreds of slugs on the floor.
Equipped with overalls, masks, oxygen tanks and two-way radios, Brady and Palmer and go down into the sewer via a manhole cover outside the house.
Brady and Palmer test their radios, then begin searching the central chambers of the sewers for the slugs' nest.
Using a rope tied to his car he manages to remove the manhole cover, just before Brady's oxygen supply runs out.
Farmer George Thomas from Merton, drives to London's Covent Garden to deliver some vegetables to a buyer.