Jeff has hired Marv "the most marvelous" Magician to inject some magic into his spooky-themed costume party. The magician's act endures total disaster at the party so he bitterly unleashes a powerful spell - cursing everyone in the room to become their costumed alter egos. With werewolf attacks, flying witches and a ketchup obsessed vampire causing chaos, Slick - wearing a Sherlock Holmes costume for the occasion - must use all his detective skills to find the disgruntled magician and break the spell so he can save Oddsville from his friends.