Tyrannical Nurse Ratched rules her ward in an Oregon State mental hospital with a strict, unbending routine. Her patients, cowed by mind- -numbing medication and the threat of electric shock therapy, dare not oppose her. But everything changes with the arrival of McMurphy- -the swaggering, fun-loving trickster with a devilish grin. McMurphy battles Nurse Ratched and the ward regime, chaleging everyone’s beliefs about madness…who, of them all, is really insane?