The Fifth FloorThe Fifth Floor is a 1978 American thriller film about a sane woman who gets sent to an asylum. It stars Dianne Hull, Bo Hopkins and Mel Ferrer.PlotThe film focuses on Kelly McIntyre, a disco dancer played by Dianne Hull who through no fault of her own accidentally overdoses on drugs and collapses at a disco. She is misdiagnosed as suicidal and sent to a psychiatric ward which is on the fifth floor of Cedar Springs Hospital. There she finds herself alone with no help, not even from her boyfriend who refuses to get her out of there. She becomes the subject of interest by an unbalanced orderly played by Bo Hopkins.