Trusted agent Melville has lost three partners in quick succession, and seems to be lying at every opportunity. Is he really the man to partner Steed in an attempt to convict Lord Edgefield, noted blackmailer? And what is the odd connection between this whole affair and daily milk deliveries?

The sudden deaths of several of Steed's former army colleagues are revealed to be part of an elaborate engine of destruction, devised by a man court-martialled by them all. And now he is playing a deadly game.

Ear, nose and throat specialists are sneezing themselves to death, each after receiving a mysterious empty envelope. When Tara is kidnapped, Steed takes great care over his morning mail.

Steed's colleague Sean Mortimer comes to see him in a very confused state. He knows there is a traitor in the organization but he has been drugged to put him in an amnesiac state and he can remember little else. Mrs. Peel investigates but she too falls prey to the drug as she and Sean are abducted by bikers. It is down to trainee agent 69, Tara King, to whom Steed is introduced by spymaster 'Mother' to help him save the day.

Steed, attempting to capture super-spy Merlin, is knocked out by a sleeping capsule, and wakes to find London deserted and under martial law. Firing squads are at large, and a nuclear bomb is holding the government to ransom.

When an agent at the Ministry of Top-Secret Information is murdered, Steed and Tara have little difficulty in locating the man responsible. But when a handwriting test indicates that he is Boris Kartovski, someone Steed thought he had killed in Berlin 5 years before, our heroes find themselves drawn into the dangerous experiments of Dr. Constantine.

Somebody is out to get super-computer George/XR40. He is shot, given false data, attacked with acid, and nearly gets his power supply cut. But until George works properly the name and nature of the culprits cannot be established.

The leaking of secrets at Carmadoc Research Establishment throws suspicion on to Steed, who must suffer the torment of house arrest while Tara goes in with a new partner.

Problems of a secret leakage from Cypher HQ and the disappearance of agent Jarret are first handed to rival Department MII2, and then to Mother's group. But why does everybody at Cypher HQ claim never to have seen Jarret and state that the only thing worthy of note that happened yesterday was that it rained?

Tara visits Steed in a special hospital following an injury to his leg. This is just the backdrop needed by Gerald Kafka, ex-head of Murder International, as he plans his revenge against Steed, who sent him to prison exactly seven years ago. At noon, Steed will die.

The directors of the Capital Land and Development Company are being murdered and the only clues Steed and Tara have are a massive footprint and a red nose.

When agents find themselves in Colonel Mannering's interrogation centre, they think it's a test of their abilities, and relax with drinks when the sessions are over. But who's fooling who. Steed plays catch the pigeon.

Members of the Institute of Timber Technology are being killed by a pair of caddish assassins, their advantage being an ability to destroy wood in seconds.

Remak is a killer, one the department are desperate to find. But a succession of agents on the trail of Remak are turning up dead, wrapped in polythene. And with Tara on holiday, Steed must go into this case with a new partner.

The spectacular theft of 3,000 top-secret FF70 rifles from a Government establishment brings Steed and Tara. Steed meets an old 'friend' and is invited to an auction. Tara has other reasons for being there.

Anticipating the arrival of his enemies to kill him, millionaire Henley Farrer sets a deadly trap for them involving an Oriental dagger and, inevitably, Steed and Tara.

To infiltrate a peace conference, Arcos, a brilliant plastic surgeon, uses a new moulding technique to transform an agent into a duplicate Steed. But when the transformation proves to be unstable, Arcos decides they need the real Steed.

The death of agent Bernard Grant, while investigating the strange goings-on at the Alpha Academy where teenagers are being prepared for inter-planetary conquest, leads Steed and Tara into the generation war.

Tara's uncle is being held against his will in a country hotel. So Tara books in, and finds herself equally discouraged from leaving. Could the place also be home to the agent that Mother is missing?

Steed, packing for a holiday, is knocked unconscious. When he wakes, he continues to pack but is confused when Tara arrives and tells him that he has been away for three weeks. Could it have anything to do with the mysterious man following him whom everybody else but Steed can see?

Whilst on a top secret security assignment, Tara comes under suspicion of being a double-agent. She must cast similar suspicion on Steed if she is to prove that she has been framed. An enemy agent, Gregor Zaroff, hopes to put the Government's new anti-missile defence system, code named 'Field Marshall', out of action by convincing Steed and Mother that Tara has betrayed the system's secrets. (Source: en.wikipedia.de)

Rich men are being blackmailed by two crime experts who plant clues to them all over the scenes of the crimes that they themselves commit. However, when they try to allege that Steed would murder Tara....

Security lapses seem to point to top civil servants suddenly falling in love and giving secrets to an enemy agent disguised as a char lady. Steed investigates, but first has to save Tara from killing herself out of unrequited love.

The discovery of a talking attache case passed from courier to courier until it finally reaches 'Mr. Big' takes Steed and Tara on a dazzling and surreal romp around London.

When a member of the International Disarmament Committee is stabbed with a swordstick on a foggy night, it looks like the Gaslight Ghoul, murderer of the 1890's, has set up in business again. Can Steed and Tara catch him before the committee is severely lacking in personnel?