When there's trouble in the town, who's always there to help? Casper! That's right, the friendliest ghost in the world is ready for action, and there's plenty of it to be had in the GBA take on the long-running franchise. Stretch, Stinkie, and Fatso are turning all of the town's parents into zombies, and the town doctor is the only one with an antidote. Unfortunately, he's turned into a zombie, too! Help Casper guide the doctor through six levels of traps and spirits, transforming the ghost into any of six helpful objects whenever necessary.