A middle aged drunk has been driving his sister and niece wild by introducing everyone he meets to his pal Harvey. Harvey is a big white rabbit, six feet three and a half inches tall, which only Elwood (and occasionally his sister when she's feeling odd) can see. The sister, Veta Louise Simmons, tries to have Elwood committed to Chumleys Rest sanatorium, but they let Elwood out and lock her up. After sorting out the mistake, Dr Chumley goes after Elwood himself.