While Radar tries to stop the camp from being shelled by their own artillery, Frank finds a wounded enemy soldier wired to explode, Margaret and Trapper get stuck in a supply shed and Henry and Father Mulcahy get blown up in the latrine.
Trapper writes a letter to his daughter, Shirley Temple dances, and the 4077th tries to take a mental break from GIs suffering from hypothermia and post-op bleeding by throwing a benefit picnic for the orphanage.
After Hawkeye makes an insulting remark about Margaret, Frank snaps him with a towel and Hawkeye responds with a nicely placed right cross to Frank's eye. Hawkeye is then placed under house arrest and instead of being treated like a criminal, he is treated like a conquering hero for what he did even to the point of getting some very tasty water buffalo steak and having movies shown in the Swamp. In the meantime, Colonel Reese, the woman in charge of all the nurses in Korea, arrives to observe Margaret and her staff and, for some strange reason, becomes attracted to ...
Hawkeye and Trapper try to unite a Korean medic with his family in spite of Frank's interference and find out that a young GI isn't telling the whole truth about his upcoming marriage to a Korean woman.
Hawkeye returns from R&R to find out Trapper has been discharged. He rushes to the airport to say goodbye but misses him. But it gives him an opportunity to welcome Trapper's replacement, B.J., to Korea.
It's a bitterly cold night, and Hawkeye and B.J. are stuck with the overnight shift and a roomful of unruly patients. In the meantime, Margaret tells Frank that she keeps all his love letters--so he ransacks her tent to get them back.
The 4077th takes in Nurse Cratty's Korean orphans during a shelling attack, including a pregnant girl with a bullet wound. But Frank accuses one of the orphans of stealing his newly (and dubiously) awarded Purple Heart.
The latest group of casualties includes a bomber pilot who claims he's Jesus Christ. Frank and Margaret think he's faking battle fatigue in order to get a discharge, and they bring in Colonel Flagg to help expose him.
Hawkeye saves the life of a colonel who wants him reprimanded for disrespect. B.J. tries to save the marriage of a friend who found out his wife is cheating on him, and Frank is paranoid that all Koreans are hiding or burying bombs.
The 4077th introduces a "soldier of the month" award, which includes a week of R&R in Tokyo, and Klinger and Radar go all out to win the honor. Frank is supposed to choose the winner, but he contracts a rare fever.