Kibosh, the perfidious King of Ghosts, decrees that Casper must scare someone before Christmas Day or he will be banished to eternal oblivion for all eternity. To make sure this happens, he confiscates The Ghostly Trio Scare licenses and flings them to the Christmas-influenced town Kriss, Massachusetts where they meet the Jollimore Family. When Casper's good behavior starts to act up, which includes befriending the daughter of the family, Holly, the Ghostly Trio call in Casper's lookalike cousin Spooky the Tuff Little Ghost and his girlfriend Poil to do the job.