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The first M*A*S*H episode without a prerecorded laugh track, "O.R.," per its title, takes place entirely in the operating room of the 4077th. As the wounded continue to pour in at an alarming rate, Hawkeye (Alan Alda), Trapper (Wayne Rogers), and the rest of the staff struggle to maintain their sanity -- and, hopefully, their sense of humor. They are aided and abetted by visiting psychiatrist Sidney Freedman (Allan Arbus), whose laid-back ministrations come in handy when Hawkeye abruptly loses a young patient after heart-massaging the boy back to life. This episode was based on the actual experiences of the 8055th, the Korean-War MASH unit that served as inspiration for the 4077th, and which once treated over 5,000 casualties during a two-month period. "O.R." was originally broadcast on October 8, 1974.