<Li> Bill Pullman as Dr. James Harvey, Kat Harvey's father who is a ghost therapist interacting with the' living impaired,' helping them to cross into the next dimension while hoping to find his deceased wife . </Li> <Li> Christina Ricci as Kat Harvey, Dr. James Harvey's 13 - year - old daughter and Casper's love interest, who has lost her mother and wants to make a friend . </Li> <Li> Cathy Moriarty as Carrigan Crittenden, a glamorous, treacherous, and greedy woman who was upset about her late father's only leaving Whipstaff to her in his will, until she discovers that the house contains treasure, and hires Dr. Harvey to get the ghosts out of the house in order to get it . </Li> <Li> Joe Nipote as Stretch, the leading member of the Ghostly Trio and one of Casper's uncles who bonds with Dr. Harvey . </Li>

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