Phelps and Mimi take on the guises of fugitives to invade the home of Jerome Cooper, a nuclear scientist, played by guest star Murray Hamilton, who is threatening to destroy a major American city with a fifty megaton hydrogen bomb.
Robert Goulet guest stars as Joe Epic, a syndicate crime leader and key figure in an IMF plan to free a captured undercover agent.
To locate several hundred million dollars in illegal gambling funds, Phelps poses as a murderer to infiltrate a gang that specializes in spiriting wanted men out of the country after first brainwashing them to learn the whereabouts of their vast sums of money.
Jim Phelps is kidnapped and held for ransom until Barney, Casey and Willy can steal an incriminating letter from a safe deposit box and turn it over to crime syndicate boss Andrew Metzger, played by guest star John Ireland.
Elizabeth Ashley guest stars as a beautiful IMF agent who becomes the key to determining if Gary Lockwood, as enemy agent Nicholai Varsi, is telling the truth when he claims he's defecting to the United States.
The IMF attempts to clear an American businessman in Japan of false charges that he murdered his Japanese wife in "Butterfly".
Ed Nelson guest stars as Van Cleve, a brilliant thief who is convinced by the IMF that he has the power of precognition as part of its plan to recover the more than five million dollars worth of art treasures that he has stolen.
John Colicos guest stars as a rebellious Caribbean government official, who plans to take over his country by having his president assassinated while in the United States to speak before a joint session of Congress.
Roddy McDowall guest stars as Leo Ostro, a brilliant crime syndicate boss who becomes the target of the IMF when he launches a mysterious one hundred million dollar scheme.
A leading illegal supplier of heroin is dying of cancer and is about to designate a successor and turn over to him the only known list containing all the vital information about the entire drug operation.
Phelps poses as the head of a Hollywood movie studio intent on making a motion picture that parallels exactly the unsolved murder committed by one of the studio's executives as part of the IMF plan to prevent a crime syndicate's takeover of the studio.
Special-guest star Jill Haworth portrays a glamorous double agent, who uses her feminine wiles on Paris to set him up for an enemy plot.
Phelps poses as a government investigator who must work through a crooked district attorney to prove that a crime syndicate boss killed his girlfriend.
A political boss hires a professional provocateur to stage a violent protest, in a maneuver to discredit his state's governor and elevate his puppet, the mayor, to the governorship.
Christopher Connelly guest stars as a non-cooperative young computer genius who has "dropped-out" of society, but is desperately needed by the IMF to complete their assignment.
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