M*A*S*H è una tragicommedia incentrata sulle vicissitudini del 4077th Mobile Army Surgical Hospital (Ospedale Chirurgico da Campo dell'Esercito) statunitense in Uijeongbu, Corea, durante la Guerra di Corea (1950-1953).
Molte delle situazioni raccontate, anche le più assurde, sono realmente accadute, come testimoniano molti dei veterani del conflitto.
Radar chronicles the antics of a typical week at the 4077th, which includes Hawkeye falling for a new nurse, a POW going berserk in the OR and Klinger seeking a psychiatric discharge.
Another letter from Hawkeye to his father tells about a bigoted soldier who wants the "right color" blood, a live grenade in the OR and Henry's home movies.
A lone sniper turns the hospital compound into a combat zone, traps Henry and Radar in the showers and forces surgery by candlelight after he knocks out the generator.
The 4077th and friends convene for their weekly “Medical Conference,” A.K.A. Poker while Radar runs over a civilian and Frank is held hostage in the showers by an enlisted man.