While Colonel Potter goes to Tokyo on R&R, his horse develops colic. Klinger becomes chronically depressed, and Hot Lips gets appendicitis. The horse is flushed out with a hose, Hawkeye and B.J. perform an appendectomy on Hot Lips, and all are well when Potter returns, except Klinger. Potter offers Klinger a discharge for severe depression, and Klinger gets very excited, which loses him the discharge.
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.