|Christina Ricci||Kathleen 'Kat' Harvey|
|Bill Pullman||Dr. James Harvey|
|Cathy Moriarty||Carrigan Crittenden|
|Eric Idle||Paul 'Dibbs' Plutzker|
|Malachi Pearson||Casper (McFadden)|
Casper (voiced by Malachi Pearson) is a kind young ghost who peacefully haunts a mansion in Maine. When specialist James Harvey arrives to communicate with Casper and his fellow spirits, he brings along his teenage daughter, Kat . Casper quickly falls in love with Kat, but their budding relationship is complicated not only by his transparent state, but also by his troublemaking apparition uncles and their mischievous antics.