Agents pursue a courier carrying a special delivery for a mysterious Russian base.
A double agent is discovered within the Canadian Secret Service.
Gambit and Purdey search for missing agents.
Agents get a lead on the identity of a spy known only as Scapina.
A Russian soldier killed in a clash with French police has claim chits in his shoe.
Kidnappers demand money and state secrets in return for Purdy.
Steed, Purdy and Gambit find themselves prey to a drug dealer's private army.
Purdy's old flame has a grudge against a visiting diplomat and the expertise to do something about it.
The team captures a professional assassin, whose henchmen kidnap a royal in exchange.
Murder suspect Steed is skeptical of a clairvoyant who offers to help him.
Steed investigates a series of suspicious deaths.
Someone acts out a personal vendetta against Steed.
A large rat appears to be the cause of a number of deaths in the London sewers.
Steed must discover the significance of film found in a dead agent's hand.
Three people use their photographic memories to transport pieces of a top-secret document.
A gang plans to use a new sleeping gas to rob London banks.
The odd behavior of many government officials is linked to a cosmetic surgeon.
The team trails a man released from prison after serving time for robbery.
A former acrobat regains his memory and recalls setting a trap for a double agent.
Vacationing agents die after attending the very training center where Purdy is.
Prominent government officials are killed in diverse accidents with one thing in common: All were caused by birds.
A disgraced spy informs Steed of a fiendish technique that allows terrorists to kill with a touch.
A criminal seeks revenge on Steed for crippling him.
A deep-seated hypnotic command turns ordinary people into assassins.
Clues in the death of a spy lead to a Scottish monastery and a group of unusual monks.