A scientist working with genetics creates a horrifying flying creature that feeds on human blood. Following a gruesome trail of dead bodies, Scotland Yard investigators must scramble to halt its ravenous rampage.

At WC Boggs' Lavatory factory, Vic Spanner is the union representative who calls a strike at the drop of a hat. However, eventually everyone gets fed up with him.

On Earth in 2018, the Doctor and his companions are enmeshed in a deadly web of intrigue thanks to his uncanny resemblance to the scientist/politician Salamander. He is hailed as the "shopkeeper of the world" for his efforts to relieve global famine, but why do his rivals keep disappearing? How can he predict so many natural disasters? The Doctor must expose Salamander's schemes before he takes over the world.

Dr. Nookey is disgraced and sent to a remote island hospital. He is given a secret slimming potion by a member of staff, Gladstone Screwer, and he flies back to England to fame and fortune. But others want to cash in on his good fortunes, and some just want him brought down a peg or two.

Lord Wingate, aquitted after appearing in court for fraud, starts up a 'finishing school' to teach girls how to extract money from rich men, in return for a percentage of their gains. He enlists the help of the Duchess of Burwood as a teacher and Hector as fitness instructor. A probation officer friend supplies the first batch of pupils fresh from Holloway prison via a clapped out old mini bus. Suspicious neighbours and police together with newspaper reports naming the prison girls now hobnobbing in high society results in a raid and new court appearance for Lord Wingate. The Judge sentences him but plots to start up his own 'school for sex'.

Investigating mysterious power failures and a death at an underground research centre, The Doctor discovers a colony of Silurians - prehistoric, intelligent reptiles who went into hibernation before man evolved. But now they have woken up, and they are prepared to wipe out mankind with a killer plague to get their planet back.

Stodge City is in the grip of the Rumpo Kid and his gang. Mistaken identity again takes a hand as a 'sanitary engineer' named Marshal P. Knutt is mistaken for a law marshal. Being the conscientious sort, Marshal tries to help the town get rid of Rumpo, and a showdown is inevitable. Marshal has two aids—revenge-seeking Annie Oakley and his sanitary expertise.

Bertram Oliphant 'Bo' West wants to clear his unjustly smeared reputation, so he joins the Foreign Legion—with Simpson his manservant in tow. But the fort they get posted to is full of eccentric legionnaires, and there's trouble brewing with the locals too. Unbeknown to Bo, his lady love has followed him in disguise.

Francis Bigger, a notorious charlatan who tours the country lecturing on the subject of mind over matter, slips off the platform in the middle of his performance and ends up in hospital under the care of Dr Tinkle. The hospital is about to enter a period of total chaos.

Sir Sidney Ruff-Diamond looks after the British outpost near the Khybar pass. Protected by the kilted Third Foot and Mouth regiment, you would think they were safe, but the Khazi of Kalabar has other ideas—he wants all the British dead. But his troops fear the 'skirted-devils, who are rumoured not to wear any underwear.