'Ghost therapist' Dr. James Harvey and his daughter Kat arrive at drafty, old Whipstaff Manor. Its greedy owner, Carrigan Crittendon, has hired Dr. Harvey to exorcise the house's apparitions: a friendly but lonely young ghost named Casper, who's just looking for a friend, and his outrageous uncles Stretch, Stinkie and Fatso (The Ghostly Trio).