Evil warlock Desmond Spellman is out to destroy Wendy, the Good Little Witch. Wendy and her witless witch aunts hide out at the Sunny Brite Resort, where the vacationing Ghostly Trio has been busy scaring up some mega-mischief and making Casper's afterlife miserable. Even though Casper and Wendy are told that ghosts and witches just don't get along, they hit it off immediately. But Desmond is closing in, time is running out, and Casper and Wendy must prevent a supernatural showdown between their families in order to defeat Desmond's plan.