The fifth season lasted from September 19, 1970 to March 17, 1971, and consisted of 23 episodes.
This was The Great Paris' second and last season on the series, played by Leonard Nimoy of Star Trek fame. And Dana Lambert's first and only season on the series, played by Lesley Warren. Doug Robert (played by Sam Elliott) also occasionally appeared in episodes.
Episode List: 1970-1971
|150px||The Killer||Writer:||Director:||9/19/70||#105 501|
|Jim Phelps and his team try to stop a hitman who makes decisions randomly. They need to find out quickly who he plans to kill and who hired him.
|150px||Flip Side||Writer:||Director:||9/26/70||#106 502|
|New team member Dana Lambert poses as the daughter of an old movie star so she can charm three men: a drug manufacturer and his two distributors.
|150px||The Innocent||Writer:||Director:||10/03/70||#107 503|
|While deleting a deadly formula from a computer, Barney Collier is captured. So a young computer whiz is enlisted, who proves to be uncooperative.
|After two women are murdered in Jim Phelps' hometown, the IMF volunteers to help him find the killer, who might be one of Jim's childhood friends.
|A Latin American country's security chief is made to believe he survived a plane crash, and is now on an uncharted island colony inhabited by prisoners.
|150px||My Friend, My Enemy||Writer:||Director:||10/25/70||#110 506|
|After Paris is abducted in Switzerland, he is subjected to a procedure that turns him into a killing machine. And his first target is Jim Phelps!
|In Japan, a powerful anti-American industrialist kills his sister and frames her husband, an American businessman, in order to discredit the United States.
|The IMF stages a funeral in order to sneak a princess out of her country in a coffin. And while her brother betrays her, Jim Phelps falls in love with her.
|150px||The Amateur||Writer:||Director:||11/14/70||#113 509|
|In Eastern Europe, Dana Lambert works undercover at a bar where the ambitious owner gets wind of her operation and tries to outsmart the IMF team.
|A mission to rescue a South African dissident goes awry when Barney Collier is shot in the leg. Separated from the rest of the team, he seeks refuge with a deaf woman.
|150px||The Rebel||Writer:||Director:||11/28/70||#115 511|
|Jim Phelps and a band of rebels attempt a daring rescue in Latin America by sneaking into the town square inside a religious statue.
|150px||Squeeze Play||Writer:||Director:||12/12/70||#116 512|
|Paris has to pretend to be a mobster with a reconstructed face in order to gain the trust of a dying old syndicate figure and his innocent granddaughter.
|150px||The Hostage||Writer:||Director:||12/19/70||#117 513|
|After he impersonates an American hotel magnate, Paris is kidnapped by rebel forces, and will only be released if the son of a rebel leader is set free.
|A youth organizer is hired by crooked politicians during Protest Week. They want him to incite violence so that their political foes appear weak.
|150px||Cat's Paw||Writer:||Director:||1/09/71||#119 515|
|Barney Collier tries to avenge his brother's death by bringing down the crooked police captain and black syndicate leader who had him killed.
|150px||The Missile||Writer:||Director:||1/16/71||#120 516|
|Dana Lambert pretends to blackmail Jim Phelps as part of a ruse to fool a foreign agent. But then a disturbed garage mechanic starts threatening her life.
|150px||The Field||Writer:||Director:||1/23/71||#121 517|
|Paris can easily impersonate the engineer of a mine field since a country's new regime has never met him. But then the real engineer is accused of murder.
|Jim Phelps and Dana Lambert join a team of deadly safecrackers. Their leader robs to fund a revolution against the United States, but the other gang members are in it strictly for the money.
|150px||The Catafalque||Writer:||Director:||2/06/71||#123 519|
|The only way to obtain a copy of a nuclear treaty is to make a Latin American official think his late father is still alive and languishing in prison.
|Jim Phelps and the team use medicine, a special lightbulb, and a doctored photo to convince a white racist colonel in West Africa that he is really black.
|150px||A Ghost Story||Writer:||Director:||2/27/71||#125 521|
|A scientist who infected himself with a deadly nerve gas is killed. In order to locate his body, his father's estate is made to appear haunted.
|150px||The Party||Writer:||Director:||3/06/71||#126 522|
|A welcome home party is staged at what appears to be the Russian consulate. It's to fool a newly released enemy agent, who can the lead the team to a top-secret list.
|150px||The Merchant||Writer:||Director:||3/17/71||#127 523|
|An arms dealer is also a well-known gambler. So Jim Phelps pretends to be the man who saved his life, while Paris tempts him with a high-stakes poker game. The IMF must stop a massive arms deal.