Casper est l'adaptation sur Saturn du film sorti en 1995, lui-même inspiré du dessin animé Casper le gentil fantôme créé en 1945. Kat et son père arrivent dans une vieille maison hantée et font la connaissance de Casper et de ses trois oncles moins aimables. Casper, qui en a marre d'être seul, doit tenter de faire de Kat son ami. Pour cela, il doit parcourir l'immense maison et venir à bout de ses oncles.
She gave my mother such a turn, that I have always been convinced I am indebted to Miss Betsey for having been born on a Friday. The word was appropriate to the moment. My mother was so much worse that Peggotty, coming in with the teaboard and candles, and seeing at a glance how ill she was, - as Miss Betsey might have done sooner if there had been light enough, - conveyed her upstairs to her own room with all speed; and immediately dispatched Ham Peggotty, her nephew, who had been for some days past secreted in the house, unknown to my mother, as a special messenger in case of emergency, to fetch the nurse and doctor.