| # | Episode | Airdate | Overview
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| 601 | "Fade Out, Fade In" | September 20 | A two-part episode. Frank Burns is despondent over the marriage of Margaret Houlihan to Donald Penobscot, so Colonel Potter sends him to Seoul for some R&R. While he is gone, casualties begin to arrive and Frank has apparently fallen out of touch (with only scattered reports of him acting strangely and accosting women who resemble Margaret). Desperately needing a new surgeon, the upper crust Bostonian Major Charles Emerson Winchester is promptly shipped from Tokyo, Japan to South Korea by a Colonel who owes him several hundred dollars from playing cribbage. Winchester's assignment becomes permanent when Major Burns is finally caught and sent stateside, only to be cleared of all charges, promoted to Lieutenant Colonel, and given command of a veteran's hospital.
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| 602 | "Fallen Idol" | September 27 | Radar is wounded while travelling to Seoul on Hawkeye's advice, and Colonel Potter has to perform surgery on him since Hawkeye cannot bring himself to do it. He follows the operating session with an all-night drinking binge. Radar is shocked that Hawkeye, who he idolizes, could have such a failing. The two have a major argument, but eventually reconcile, realizing that they both are only human.
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| 603 | "Last Laugh" | October 4 | One of B.J.'s old buddies shows up at the 4077th, and is a bigger practical joker than B.J. and Hawkeye combined. Unfortunately, his joke backfires and B.J. finds himself under arrest. Everybody must now undo the joke so they can exonerate B.J. (and exact revenge if they can). An irritable Margaret desperately requests a visit to Tokyo to see her husband.
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| 604 | "War of Nerves" | October 11 | Tensions are building at the 4077th, and morale is at an all-time low. Dr. Sidney Freedman is visiting to follow up on a wounded soldier he sent back into battle, and convinces a concerned Colonel Potter that a big bonfire may be what it takes to let people vent their frustrations and get back to work.
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| 605 | "The Winchester Tapes" | October 18 | Major Winchester records a taped message home to his parents, begging them to do whatever it takes to get him home. Hawkeye is invited to spend the weekend with a newly-single nurse formerly assigned to the camp, but duty calls--over and over and over.
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| 606 | "The Light That Failed" | October 25 | Short on entertainment and supplies, a mystery novel that B.J. receives in the mail becomes quite popular at the camp as everyone follows the story with B.J. There is only one problem: the last page is missing, so nobody knows how the story ends. Everybody in the camp works together to solve the mystery or track down the author and call her so they can find out whodunnit.
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| 607 | "In Love and War" | November 1 | While helping a Korean family with an ailing elderly woman, Hawkeye develops a strong attachment to the mother. He is saddened when the grandmother dies and the rest of the family decide to flee south. Major Houlihan learns something about her husband's actions while away from her that she'd rather not have learned.
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| 608 | "Change Day" | November 8 | Major Winchester has a get-rich quick scheme involving the coming change of Army scrip, while Klinger comes up with a new plan to get out of the Army: get admitted to the United States Military Academy and get kicked out for purposefully failing his exams so he can go back to the States.
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| 609 | "Images" | November 15 | After seeing them on lots of soldiers and marines coming through the camp, Radar decides to get a tattoo, while his friends try to talk him out of it as unsanitary and dangerous.
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| 610 | "The M*A*S*H Olympics" | November 22 | To promote physical fitness at the camp, Colonel Potter stages a miniature Olympic games during a lull in the fighting. The grand prize of seven-day R&R passes for the winning team members drives everybody to do their best.
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| 611 | "The Grim Reaper" | November 29 | A visiting Colonel unemotionally calculates how many soldiers will die in the next battle, driving Hawkeye to shove him against a wall in disgust. The Colonel begins court martial proceedings, only to drop them after Hawkeye saves his life in the operating room, realizing how necessary he is to the army despite his lack of discipline.
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| 612 | "Comrades in Arms (Part 1)" | December 6 | Hawkeye and Margaret Houlihan have to put their differences aside and cooperate when they get stuck behind enemy lines while on assignment and must take shelter in an abandoned hut. Margaret receives a letter she never expected.
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| 613 | "Comrades in Arms (Part 2)" | December 13 | Hawkeye and Margaret, while on their way to the 8063rd to demonstrate a new surgical technique, must avoid capture by North Korean patrols and return to the 4077th, then deal with the emotions they experienced while stranded together.
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| 614 | "The Merchant of Korea" | December 20 | B.J. has to borrow money from Major Winchester, which Major Winchester uses as justification to treat B.J. like a servant. To get even, they invite Winchester to a poker game hoping to fleece him, only to find out that he is experiencing an amazing stroke of luck and is winning big. His winning streak comes to an end when Hawkeye and Radar realize that he gives himself away when he is bluffing.
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| 615 | "The Smell of Music" | January 3 | Hawkeye, B.J. and Major Winchester have a battle of wills over Winchester's latest hobby: playing the French Horn. Hawkeye and B.J. refuse to bathe until the instrument is silenced, but Winchester keeps playing in defiance. Everybody else in the camp grows tired of both the smell and the music, and take matters into their own hands. Col. Potter tries to prevent a suicidal patient from killing himself.
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| 616 | "Patient 4077" | January 10 | Hawkeye and B.J. grow tired of sending soldiers home with amputated limbs, and want a more precise surgical clamp to help prevent this. They come upon a local peddler and craftsman to have such a clamp made, and use their custom equipment to save a young soldiers leg. Klinger accidentally loses Major Houlihan's dimestore wedding ring, but gets help from Hawkeye and B.J. to replace it with an (almost) identical ring.
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| 617 | "Tea and Empathy" | January 17 | After the camp supply of penicillin is stolen and they cannot get any more through legitimate methods, Father Mulcahy decides to try his luck at the black market to get medicine for the camp, and brings Klinger along for help.
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| 618 | "Your Hit Parade" | January 24 | During a long session in the operating room, Radar plays disk jockey to the camp with a collection of records that just arrived. Colonel Potter shows a special afffinity to one of the records, Major Winchester scrambles to find a place to sleep, and B.J. must perform a blood transfusion with a heavily intoxicated donor.
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| 619 | "What's Up, Doc" | January 30 | Margaret Houlihan believes she might be pregnant, which would end her military career, and needs a pregnancy test. Unfortunately, the only test available in this era requires a rabbit, and the nearest rabbit belongs to Radar. Radar objects to the procedure, which would kill his rabbit, but agrees when they perform a procedure that would only require the rabbit to be spayed. Meanwhile, B.J. and Charles try to console a patient who refuses to return to the front, and who holds Charles and later Klinger hostage to be sent home.
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| 620 | "Mail Call Three" | February 6 | After being delayed for three weeks, a flood of mail arrives at the 4077th. Hawkeye gets mail addressed to another Benjamin Pierce, B.J. finds out that his wife is the subject of another man's advances and Radar is upset to learn that his widowed mother has a boyfriend. Klinger's wife informs him that she wants a divorce.
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| 621 | "Temporary Duty" | February 13 | During an officer exchange program, Hawkeye spends some time at another MASH unit, while the 4077th hosts an irritating and obnoxious surgeon that everybody can't wait to be rid of and a nurse from Major Houlihan's past.
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| 622 | "Potter's Retirement" | February 20 | Colonel Potter considers retirement when he finds out that anonymous letters are being sent from the camp, accusing him of incompetence.
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| 623 | "Dr. Winchester and Mr. Hyde" | February 27 | Exhausted from his duties and the stress of war, Major Winchester turns to amphetamines to stay active, but the drugs quickly take a toll on him. Radar races his pet mouse against one belonging to a Marine unit in a maze.
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| 624 | "Major Topper" | March 27 | Due to a shortage of actual morphine, they are forced to try to take advantage of the placebo effect. Meanwhile, Klinger works with another soldier who he thinks deserves a Section Eight discharge more than he does. Major Winchester repeatedly tops the accomplishments of Hawkeye and B.J. with stories of his own.
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