R.P. McMurphy (Jack Nicholson) is a misbehaved con who shirks authority and finds himself in an asylum after faking insanity to get out of work detail in prison. The vivacious troublemaker soon finds himself in a worse kind of prison – one presided over by the repressed, terrifyingly quiet Nurse Ratched (Louise Fletcher).It's not long before McMurphy is reaching out to his new inmates, trying desperately to bring life to an otherwise dead atmosphere.