Based on the Casper film, the game puts you in the role of the friendly ghost trying to make a friend and a second chance at life instead of scaring everyone away.
The plot centers around the "spoiled, grasping inheritor of Whipstaff Manor" - Carrigan Crittenden. She's after the treasure she thinks is hidden in the walls. Casper will need the help of Dr. James Harvey - therapist to the dead - if he has any hope of succeeding in his adventures.
Casper will also have to deal with his uncles - Stretch, Stinkie, and Fatso, who just love to scare "Fleshies" and thwart Casper's efforts. The gameplay is 3d - and is mostly puzzle solving, with Casper able to take a variety of forms and can manipulate objects.