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.
Margaret takes off in the middle of the night to help deliver a Korean baby. Nobody knows of her whereabouts, and Colonel Flagg is brought in to help investigate her disappearance.