The 4077th Mobile Army Surgical Hospital is stuck in the middle of the Korean war. With little help from the circumstances they find themselves in, they are forced to make their own fun. Fond of practical jokes and revenge, the doctors, nurses, administrators, and soldiers often find ways of making wartime life bearable.
Hawkeye undergoes a drastic change when he becomes temporary commander of the 4077th, and learns about the tedious bureaucracy and accompanying headaches that Colonel Potter deals with daily.
Hawkeye becomes so disgusted with the stalled Panmunjon peace talks that he impulsively takes matters into his own hands, and goes to the meetings to lend a hand.
Colonel Potter meets a female soldier of the same age and interests as himself, named Lil. The others in the camp think that he might be cheating on Mildred, even though his friendship with Lil is completely platonic. Meanwhile Hawkeye tries to find out what B.J.'s initials stand for. As it turns out, he was named after his parents, Bea and Jay Hunnicutt.
Newscaster Clete Roberts, reprising an earlier interview appearance, returns to update Korean War conditions, when he conducts a series of television talks with the leading characters of the 4077th.
Charles becomes so irate, when he is turned down for a future medical position at home, that he refuses to talk to anyone in the unit, until Hawkeye and B.J. send him a false telegram from home. Meanwhile, a young soldier, Jerry Wilson, can't remember his own identity, so Sidney Freedman is called for help.
As the temperatures reach triple digits, Hawkeye and BJ recieve their new rubber bathtub from Abercrombie & Fitch. However, soon the whole camp is hot under the collar as word leaks out about the tub and everyone wants a dip, except for Klinger, who is trying to get his Section 8 by wearing a fur coat.
A strong windstorm affects the M*A*S*H personnel in varying ways: Hawkeye and most of the unit busy themselves securing items that could blow away; Radar prepares his animal hutch for the worst; a disgusted Charles switches his Tokyo-leave transportation from air to ground, and runs into a difficult medical situation en route to Seoul.
Captain Tom Greenleigh of Stars and Stripes comes to the 4077th to write an article about Charles, which makes him act even more egotistical than usual. Meanwhile, Margeret finds out her estranged husband Donald has tied up their joint account, while fending off at first -- then accepting -- the advances of Greenleigh. Klinger dresses up as various movie characters with the hope that Stars and Stripes will write about how crazy he is.
While everyone is complaining about the record cold snap, Charles becomes the most unpopular man in camp, when his parents send him a winter-ized polar suit that he insists on flaunting in front of everyone.
In this unique episode, the camera becomes the eyes of a young wounded soldier. It records his sensory responses to being wounded, flown by helicopter to the 4077th, examined, operated on, and treated in post-operation.
Hawkeye and B.J. discover that Charles is living the life of Riley, thanks to the attentions of his menially paid Korean servant, Comrade Park, a man of unusual skills. He has an important contribution to make - a native remedy for a seemingly insoluble medical problem.
Heavy casualties are arriving, creating severe problems for the M*A*S*H unit because they are nearly out of Pentothal. Mulcahy takes up a collection from everyone - including a case of wine from Charles' private supply - and he and Charles take the jeep to make a trade with the black marketers for Pentothal.
Father Mulcahy takes being passed over for promotion philosophically until he hears of the rapid advancement made by a heroic helicopter pilot. Then his uncharacteristically bold actions stun Colonel Potter and the entire company.
B.J. almost becomes the surrogate father to a Korean family. Finding them a substitute for his own absent family, B.J. spends so much time with them that his medical efficiency begins to suffer, and Hawkeye worries about his health. B.J.: "First they take me from my wife and kid, and just when I find something to help fill the gap, they take that away, too."
It's instant attraction for Hawkeye when a beautiful Swedish doctor, called Inga, arrives to observe combat surgery. That is, until she upstages him in the operating room with a superior technique, and his ego is bruised.
The 4077th is confronted by two crises: Colonel Potter's mare, Sophie, mysteriously disappears from her corral, and Hawkeye and B.J. find themselves with a young Korean boy on their hands, who is trying to avoid conscription into the Army.
A lecture on the latest techniques by a young surgeon from Tokyo, and a later demonstration of his surgical skill, turns Winchester into a drunk and Potter into an invalid, whilst bringing home to Hawkeye and B.J. that they are out of touch with new medical practices.
Radar, who is smitten with the cute new nurse, Linda Nugent, relies on Hawkeye's expertise on how to cope with the situation. Hot Lips, meanwhile, celebrates her just-granted divorce by taking a step that arouses Colonel Potter's ire.
The 4077th evacuation to a nearby cave to, avoid U.S. artillery fire on a Chinese target, poses problems for Hawkeye, who has a claustrophobia problem that Colonel Potter is unaware of. On the other hand, Margaret hates loud noises. And then there's the problem of a seriously wounded soldier...
The sinister Colonel Flagg pops up at the 4077th again, playing his usual spy games, convinced that Hawkeye is a communist sympathizer, after he saves the life of a North Korean soldier. Also, an American soldier is less than impressed.
The impossible happens for the snobbish Charles when he shares an emotional experience with Klinger, who discovers a U.S. nurse, Debbie, finds him and his bizarre attire attractive, while Charles succumbs to the exotic charms of a Korean girl, called Sooni, who he meets at Rosie's Bar.
Talk of a post-war reunion gives BJ an idea- planning a present-day stateside gathering of 4077th families. He continues to obsess with the idea even under the duress of bug-out instigated by a Chinese breakthrough. Also, Klinger fears that the party will blow his cover, as his mother doesn't know he's stationed in Korea.
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