Scooby-Doo and Shaggy must go into the underworld ruled by the Goblin King in order to stop a mortal named The Amazing Krudsky who wants power and is a threat to their pals, Fred, Velma and Daphne.

「神秘事件公司」成員一行人決定放下忙碌的偵探工作，來到熱帶島嶼好好度假。沒想到，他們發現這座小島不僅似曾相識，而且還被突然出現的殭屍大軍追得到處跑！這次的謎團真相，究竟只是狡猾罪犯在裝神弄鬼，還是真的有看不見的超自然力量在作祟？