A notorious colonel's visit makes Margaret re-evaluate herself, while Kellye is fed up with Hawkeye seeing her as one of the boys and not a woman with a crush on him. The colonel is played by Peggy Feury in a guest appearance.

The 4077th's Halloween party is sidetracked by wounded and a brawl that starts at Rosie's. A soldier declared dead by battalion aid isn't actually dead, and Richard Lineback plays a wounded soldier suffering from malnutrition because of survivor's guilt. Lineback had previously appeared in the Season 8 episode "Dear Uncle Abdul." George Wendt plays a Marine with a pool ball stuck in his mouth, and Andrew Dice Clay (billed as "Andrew Clay") plays another Marine who is attended to by B.J. for injuries incurred from driving into a chicken coop while drunk.

An Army PR officer (Jeffrey Tambor) looks for a scoop worthy of propaganda when an enemy pilot lands near the 4077th — a reference to Operation Moolah — while Charles falls for a French Red Cross volunteer.

B.J. is tired of hearing how great a prankster Trapper was, so he swears to pull the ultimate prank on the whole camp.

Hawkeye volunteers to deliver the eulogy for a nurse no one actually knew, while Klinger seeks an investor for his latest invention — the hula hoop.

Hawkeye and Charles start a rumor that Marilyn Monroe is coming to the 4077th, while a sniper interrupts B.J.'s fishing trip and involves him in a helicopter rescue.

Note — Marilyn Monroe visited Korea in February 1954. Baseball star Ted Williams' departure from Korea is mentioned as a current-events news item.

Potter gets paranoid when his wife sends Hawkeye a letter, while B.J. treats a lieutenant paralyzed by a sniper.

Hawkeye and B.J. try to get a racy movie (The Moon Is Blue) to spice things up at the 4077th, while a wounded, teetotaling general declares last call for the officers' club. Note: "The Moon Is Blue" didn't come out until July 1953, far too late for MASH 4077 to immediately receive it.

Klinger depends on divine intervention when Father Mulcahy is chosen to race a veteran track star from another unit. During the race, the track star learns that Mulcahy is racing to raise money for the local orphanage, and the two hatch a scheme to get Klinger to donate all his money to the orphans with Mulcahy winning. Meanwhile, Charles stands up for a stuttering soldier, threatening to report his bullying CO for inhumanity. He befriends the man and cheers him up, giving him a copy of Moby Dick as a gift. It's revealed that Winchester's fabled sister, Honoria, is a stutterer herself and Winchester has a soft spot for others like her.

The 4077 is visited by a UN delegation consisting of an Indian officer who teaches yoga to Potter and Klinger, a Swedish delegate whom Margaret falls for, and a British officer who baits Charles, while B.J. feels guilty about not preparing a patient for the possibility of having a leg amputated.

While Charles angrily denies his incessant snoring, Potter inadvertently learns depressing news about his visiting son-in-law that reminds him of a mistake in his own past.

Margaret contracts laryngitis on the eve of her meeting with a world-renowned surgeon, while a no-nonsense major general (John Anderson) sets up camp at the 4077th, where his son is being treated.

An old Army buddy of Potter's (John McLiam) has caused unnecessary casualties by overstepping his boundaries. When Charles receives a new shipment of classical records and Margaret receives a new turntable with no records, B.J. plays the two against each other to rid the Swamp of Charles' music.

A wounded GI and the North Korean he shot end up bunked next to each other in post-op, while the position of charity-collection officer is passed around.

Margaret collects significant items for a time capsule, while B.J. and Rizzo play practical jokes on each other. Meanwhile, Klinger finds himself falling in love with a young South Korean woman (Rosalind Chao) mistaken for a sniper and separated from her refugee parents, while the time capsule items — including Radar's old teddy bear and a fishing lure that once belonged to Henry Blake — remind everyone of former colleagues and former patients alike.

Hawkeye is in a military mental hospital after suffering a nervous breakdown. Dr. Sidney Freeman helps Hawkeye to recover by facing the horror and pain he felt when a Korean mother smothered her baby to keep it quiet when a military bus faced peril from a North Korean patrol. As he returns to camp, the Korean War comes to an end. The staff of the 4077th tends to one final deluge of casualties, including Chinese musicians mentored by Winchester. B.J. gets orders to go home early but is forced back to the 4077th after he learns the orders were rescinded by the time he reaches Guam. The rest of the staff sorts out their personal problems before going their separate ways. Father Mulcahy tries to come to terms with the hearing trouble caused when a mortar shell exploded near him. Margaret awaits her stateside assignment and makes peace with Winchester, whose deep love of music has now been compromised forever. Potter leads an emotional farewell dinner where assorted staffers reveal their postwar plans. Hawkeye looks forward to a simple country doctor's life in his native village of Crabapple Cove, Maine. Klinger, after years of trying to get out of the Army, is staying in Korea to help Soon-Lee (Rosalind Chao) find her missing family. Klinger and Soon-Lee's wedding leads off the final scene where the staffers say their last emotional goodbyes to each other.