Throughout the film, Kat becomes friends with Casper, and the Ghostly Trio plays a prank on Dr. Harvey ... Dr. McFadden invented a machine to transform his ghostly son back into a mortal ...

she hires afterlife therapist Dr. James Harvey (Bill Pullman) to exorcise the ghosts from the mansion. James and his daughter, Kat, move in, and soon Kat meets Casper, the ghost of a young boy who ...