A secretary's macabre tale makes Steed and Tara question the deaths of businessmen facing fraud charges.
Soviet agents held in a British monastery vanish, only to reappear and murder their old adversaries.
Brothers (Julian Glover, James Cossins) plan to substitute Tara for their uncle's lost love, to locate his fortune.
Agents plan to disrupt a conference with a remote-controlled bomb implanted in the victim's neck.
Murder International plots to convince Steed and Tara that Mother has been killed.
A psychiatrist has his patients fantasize murdering board members then sends them out to commit the homicides.
An archaeologist's colleague is the victim of a device that recharges by absorbing energy.
Mother relates an incident to his aging aunts about an attempt to steal the art treasures in Britain.
Steed must prove Tara's innocence in one day, after she is accused of selling military secrets.
Foreign delegates to an arms conference are slain in the style of a 19th-century mass murderer.
Steed and Tara follow a talking briefcase containing stolen secrets, passing from one enemy to another.
Steed doubts his sanity when he can't recall anything about a three-week holiday; guest Kate O'Mara.
An unusual form of mind control is used to force its victims to fall in love with the next person they see.
Tara's uncle's business empire is threatened by a takeover when he fails to return from holiday.
Some murders with very pat clues make Steed suspect the accused are being framed.
Steed, Tara and a clever spy awake from a gas-induced sleep to find the city evacuated, and search for a nuclear bomb.
Steed and Lady Diana (Jennifer Croxton) investigate the computer-controlled murders of fellow agents.
Tara undergoes a survival exercise while she and Steed probe an agent's disappearance.
Assassins using a substance that instantly dissolves wood kill five men who posed for a photograph.
A brilliant plan to extract information from agents includes a dentist's office that doubles as a torture chamber.
Scientists want to produce a duplicate of Steed to infiltrate a peace conference and plant a bomb.
Steed suspects 3,000 stolen, top-secret rifles may be going to an African colonel planning a coup.
Steed and Tara investigate the murders of several land developers, apparently killed by clowns. Guest: John Cleese.
In a convalescent hospital, Steed, Tara and a band of injured agents battle a vengeful madman.
Assassins, thugs, cutthroats and collectors seem to be after a dagger sent to Steed for safekeeping.
Following Steed's arrest at headquarters, Tara investigates data leaks at a research station.
Steed and Tara investigate the loss of several agents, and suspicion points to an inside man.
A sabotaged computer at a research facility targets its inventor as a traitor.
An agent murders after assuming the personality of a spy thought to be dead; guests Nigel Davenport, Julian Glover.
Otolaryngologists die from violent sneezing and choking after each opens a special-delivery envelope.
The hunt for a murdered agent leads to a glass-cleaning service involved with stealing secret codes.
Steed is trapped in a diabolical game when his five co-members on a wartime tribunal begin to be murdered.
Pursuing a traitor in the organization, Steed meets Trainee Agent 69, a k a Tara King (Linda Thorson).
A scientist destroys a Treasury official with a shrinking ray, then trains it on Emma and Steed.
Emma's friend visits a house he bought in a quiet town, unaware of strange and murderous events there.
A man who can charge himself with electricity kills the researchers of a project to broadcast electric power.
A gang blackmails millionaires with mock attempts on their lives, then threatens the real thing.
Steed, Emma and two thugs compete to find a metal box hidden by an agent in a treasure chest, the prize in an auto rally.
Clues point to an industrialist/financier after a man dies with a cache of diamonds in his stomach.
British conference delegates have strange dreams suggesting impending death.
An art lover (Peter Cushing) resurrects the cybernauts to capture scientists to eliminate Steed and Emma.
Assassins use a machine to switch personalities and bodies with Steed and Emma to pose as double agents.
A weekend of bridge in Devonshire ends when a criminal that Emma sent to jail comes seeking revenge.
British peers, privy to defense secrets, hallucinate about their childhoods and their mutual nanny.
An agent's murder on a railway line leads to a clerk passing information and a plot to kill the prime minister.
Steed and six experts are brought to an island and told one of them will kill the others; guest Charlotte Rampling.
A deranged director captures Emma to star in a film about the life and death of the inimitable Mrs. Peel.
A walking corpse escapes from a mortuary, causes an accident, then disappears; guest Christopher Lee.
When two enemy agents are murdered, Emma and Steed help a pair of foreign operatives flush out the killer.
The only clue to mauling deaths, including those of a farmer and a big-game hunter, is a medallion.
Reports of a ghost in a duke's chapel lead to a supernatural investigator's murder and Emma's kidnapping.
Marks on the bodies of a publisher, his son and other ruthless men indicate they were killed by a giant bird.
A parrot named Captain Crusoe appears to relay data on a top-secret missile base.
An apparently invisible man steals secret files on an inventor who claims to have sold his invisibility formula.
An agent dies after stumbling onto a plot to help fugitives escape back into time.
Businessmen are being driven mad as a consulting firm attempts to control them by preying on their fears.
A blinding light bleaches the corpses of British Venusian Society members; special guest Jon Pertwee.
A jar of honey is a clue to an agent's murder, involving a fantasy company and a Middle Eastern prince.
The murders of several city executives all result in promotions for the secretaries.
At a university, Steed and Emma investigate the death of an economist who drafted a plan to eradicate world poverty.
In the country to inspect a house she inherited, Emma is trapped in a giant machine built for revenge.
Steed poses as a butler to trap a military man who is passing information.
Public humiliation angers an Eastern bloc diplomat and causes a sheik to cancel an oil deal.
While investigating a general's death, Emma encounters a bizarre club that craves mortal danger. Guest star: Nigel Davenport.
A clue to a murder leads Emma to a dancing school, where a man is using the deceased's identity.
A colleague's murder takes Emma and Steed to a golf club and strange goings-on at the 13th hole.
Back from vacation, Steed finds an actress impersonating Emma, and people stabbed with knitting needles.
The death of a doctor by poisoned arrow leads Steed and Emma to a plot to take over a jungle nation.
After his two-year absence, a scientist's ramblings indicate he was in a concentration camp.
An attempt to blackmail the government is made by using a chemical 'fertilizer' that kills animals and plants.
Two telepaths invade Steed's dreams to force him into revealing vital information.
Enemy agents want a man to impersonate Steed and infiltrate a conference of defense leaders.
The trail of missing horticulturists leads Emma and Steed to a downed spacecraft.
Emma and Steed play the stock market after a banker's sixth executive client dies.
Steed takes Emma to his old RAF base but finds it empty and the clocks stopped at 11.
Steed and Emma suspect unnatural causes when a freak rainstorm kills a poacher in a field near a winery.
Puzzling homicides point Emma and Steed to a matchmaking service arranging murders as well as marriages.
A hypnotized doctor murders his patient, a high official suspected of treason.
Steed and Emma travel to a Scottish loch where a frogman who was tortured on a rack is found on the shore.
A receipt from a dead agent's pocket leads the avengers to the plotting of an atomic threat.
An art lover (Peter Cushing) resurrects the cybernauts to capture scientists to eliminate Steed and Emma.
A supposedly dead doctor and an eccentric peer figure in plans to jam early-warning systems.
Steed and Emma find a hidden army at a coastal village while investigating the disappearance of agents.
An unusual chess piece provides the clue to breaking up a smuggling ring.
A regimental cocktail party leads to information about a military exercise to take over London.
An assassination plot threatens a peace concert by a Soviet pianist.
Steed and members of the opposition realize that a third group is committing crimes and blaming them.
Steed handles security arrangements for a former British traitor.
An attempt to steal a long-range jamming device results in the theft of a mousetrap.
Murder at the race track leads Steed to the head of a betting syndicate.
A barrel of wine holds the clue to the theft of military secrets.
The unexpected deaths of several millionaires, all in the same area, arouse Steed's suspicions.
A brainwashed agent believes that he can prove Steed is a double agent.
A doll is used to smuggle the names of British agents to the opposition.
The abduction of a white elephant leads to a discovery of illegal ivory trade.
A New Year's Eve costume party is a ruse to take valuable land away from the guests.
A coup is planned and depends on the perfectly timed death of an emir.
Cathy endures a night of terror after an old enemy resurfaces.
An international gold-smuggler uses a Chinese restaurant as a cover.
Steed and Cathy investigate crop contamination and suspicious illnesses.
A cosmetics firm is used as a front for a plan to discredit the British government.
Diamond smugglers use a pair of corneas to cover up their crime.
A plan is developed by Cathy and Steed to entrap a group of thugs, putting them out of commission.
A newly elected official who promised to uncover a security scandal is murdered shortly after his election.
After a supposed poor man leaves a huge sum of money to his wife, Steed becomes suspicious.
An attractive young girl may be responsible for stealing a file containing the names of double agents.
A plot to replace the top men at the Ministry of Security with doubles is discovered.
Steed and Cathy investigate a questionable rest home for millionaires.
Cathy and Steed plot their own arrest and conviction.
An innocent-looking bar of soap becomes life-threatening for a young boxer.
Plans to build a nuclear-powered liner affect a major shipping firm.
The murder of a deep-sea diver leads Steed to a secret experiment.
Steed is marked for murder by the Mafia as a cover-up for a drug deal.
A cypher clerk's suicide is questioned when his photograph shows up after his supposed demise.
An astronomer is killed after he realizes that the earth may be the target of a falling star.
Blackmail may be behind the alleged suicide of a university tutor.
Virus-filled eggs disappear after an attack on an experimental scientist.
Black magic is behind a scientist's comatose condition and the theft of a fuel formula.
Steed becomes involved after NATO secrets are being leaked and a magician's assistant is killed.
Mystery, intrigue and murder surround an unbreakable clay tile.
Cathy's courage is tested as she poses as a new female recruit for a crime organization.
A suspicious plane crash, missing money and a convent lead to danger for Steed and King.
A courier's murder leads Steed to a crooked politician and a plan to overthrow a South American government.
As a prelude to murder, the final tests on the most advanced computer ever built are sabotaged.
Steed impersonates a naval officer to get the inside story on reported espionage.
The death of a diamond merchant's wife prompts Steed to go into the precious rocks business.
The attempted murder of a United Nations official points to the existence of a traitor in the organization.
The supposed death of a Great Dane sets the scene for murder and embezzlement.
A rare stamp leads to a radical group planning a world takeover.
A gang of assassins attempts to recruit Steed.
Dr. King is put aboard a luxury liner on its way to Canada for a holiday, but microfilm and murder dampen the mood.
Cathy joins the board of a company specializing in murder and smuggling.
The president of a foreign country fears for his own life after his bodyguards are killed.
The theft of a new rocket fuel and murder propel Steed to investigate.
Steed's partner (Honor Blackman) puts out a contract on his life.
Hired thugs target a professional marrier.